AFD 111 Exam

Which timing chain type is also called a "silent chain"? A)Roller B)Morse C)Flat link D)Both B and C

D) Both B and C

Which of these components is the valve seal?

D) D

All overhead valve engines

have the valves located in the cylinder head

The metric unit for torque used by most original equipment manufacturers (OEM) is which of these?

Newton-Meter

Tech A crankshaft determines the stroke of an engine. Tech B the length of the connecting rod determines the stroke of an engine

Tech A

A rotating force is called

Torque

The following statements are all correct except

Torque always results in movement.

A SOHC 8 engine has how many camshafts?

Two

Any internal part that has a crack or flaw should be replaced, not repaired. 1) True 2) False

1) True

Valve guides are measured using a micrometer and a hole gauge. 1) True 2) False

1) True

Hydraulic lifters or hydraulic lash adjusters (HLA) may not bleed down properly and could cause an engine miss if ________. A)The engine oil is 1 quart low B)The wrong API-rated engine oil is used C)The wrong SAE-rated engine oil is used D)Both A and B

.

What determines the amount of valve overlap? A)Total lift in degrees B)Cam lobe accuracy C)Camshaft design D)Timing gears or chain

...

How many degrees of camshaft rotation is needed for a piston to travel from TDC to BDC and return to TDC?

180 degrees

Cracks in cast iron cylinder heads can easily be repaired by welding. 1) True 2) False

2) False

Resurfacing of the cylinder head has no effect on the compression ratio. 1) True 2) False

2) False

A normally asapirated atuomobile engines loses about _____ power per 1000 feet of altitude

3%

An 8-cylinder engine with a bore of 4.000 inches and a stroke of 3.000 inches has a displacement of

302 cubic inches

A 5.7-liter engine is about what size in cubic inches?

350

How many degrees of camshaft rotation are needed to complete the four-stroke combustion cycle?

360 degrees

How many degrees of crankshaft rotation is required for a piston to travel from TDC to BDC and return to TDC?

360 degrees

An engine with a displacement of 302 cubic inches converts to ___ liters (rounded off).

4.9 liters

How many degrees of crankshaft rotation is needed to complete the four-stroke combustion cycle?

720 degrees

One cyclineder of an automotive four-stroke cycle engine completes a cycle every

720 degrees

The gasket surface of a cylinder head, as measured with a precision straightedge, should have a maximum variation of ________. A)0.002 inch in any 6-inch length or 0.004 inch overall B)0.001 inch in any 6-inch length or 0.004 inch overall C)0.020 inch in any 10-inch length or 0.020 inch overall D)0.004 inch in any 10-inch length or 0.008 inch overall

A) 0.002 inch in any 6-inch length or 0.004 inch overall

If an interference angle is machined on a valve or seat, the angle is usually ________. A)1 degree B)0.005 degree C)1-3 degree D)0.5-0.75 degree

A) 1 degree

The pressure in a gasoline engine combustion chamber can be as high as ________. A) 1000 PSI B) 400° C) Both A and B D) Neither A nor B

A) 1000 PSI

Engine cranking vacuum should be ________. A) 2.5 in. Hg or higher B) Over 25 in. Hg C) 17 to 21 in. Hg D) 6 to 16 in. Hg

A) 2.5 in. Hg or higher

To lower and narrow a valve seat that has been cut at a 45-degree angle, use a cutter or stone of what angle? A)30 degrees B)15 degrees C)45 degrees D)60 degrees

A) 30 degrees

Which media is best to use for cleaning parts, as it does not need to be thoroughly cleaned after using? A)Baking soda B)Stainless steel shot C)Glass beads D)Aluminum shot

A) Baking soda

What would happen if oil or water (coolant) was at the bottom of a dry hole in the bolt when the head bolts are installed and torqued? A) Block could crack B) Bolt would break C) Liquid would be forced upward and out of the hole D) Either B or C

A) Block could crack

Which of these smoke types indicates oil being burned in the combustion chamber? A) Blue B) Black C) White D) Grey

A) Blue

Most chemical cleaners used for cleaning carbon-type deposits are strong soaps called ________. A)Caustic materials B)Acid materials C)Cleaning materials D)pH materials

A) Caustic materials

All of the following are methods of mechanical cleaning EXCEPT ________. A)Chemical solvents B)Abrasive blasting C)Scraping D)Brushing

A) Chemical solvents

Cam bearings should be installed ________. A) Dry B) Oiled C) With 0.100 inches of crush D) Both B and C

A) Dry

Piston ring end gap can be increased by ________. A) Filing the ring to make gap larger B) Installing oversize rings C) Sleeving the cylinder D) Knurling the piston

A) Filing the ring to make gap larger

What can happen if gasket surfaces are too smooth? A) Gasket can move out of proper location, causing leakage B) Gasket will not be able to seal the deep grooves in the surface C) Nothing will happen D) Gasket will seal with no leaks

A) Gasket can move out of proper location, causing leakage

What force causes a head gasket to be drawn downward during engine operation? A) Intake stroke vacuum B) Gravity C) Head bolt torque D) Exhaust gas pressure

A) Intake stroke vacuum

Which type of valve guide is most used in a cast-iron head? A)Integral B)Bronze C)Powdered metal (PM) D)Thin-wall sleeve type

A) Integral

For lowest hydrocarbon emissions, which of these engine design features is used? A)Low combustion chamber surface area-to-volume ratio B)High combustion chamber surface area-to-volume ratio C)Non-centrally mounted spark plug D)Increased (as much as possible) quench area

A) Low combustion chamber surface area-to-volume ratio

Some vehicle manufacturers recommend repairing integral guides with ________. A)OS stem valves B)Knurling C)Replacement valve guides D)Valve guide inserts

A) OS stem valves

Use of the wrong type of RTV silicone sealer could damage the ________. A) Oxygen sensor B) Crankshaft sensor C) Water pump gasket D) Water pump

A) Oxygen sensor

Main bearings and rod bearings should be checked for proper oil clearance by precision measuring the crankshaft journals and inside diameter of bearings, or by using which of these? A) Plastigauge material B) Rubber gauging material C) Steel ruler D) Vernier caliper

A) Plastigauge material

Dampers (damper springs) are used inside some valve springs to ________. A)Prevent valve spring surge B)Keep the valve spring attached to the valve C)Decrease valve spring pressure D)Retain valve stem seals

A) Prevent valve spring surge

Many cleaning methods involve chemicals that are hazardous to use. The least hazardous method is generally considered to be the ________. A)Pyrolytic oven B)Hot vapor tank C)Hot soak tank D)Cold soak tank

A) Pyrolytic oven

The use of a knurling tool is being described. After the knurling tool displaces the metal inside the guide, a ________ is run through the guide to produce a restored, serviceable valve guide. A)Reamer B)Drill bit C)File D)Ball gauge

A) Reamer

Installed height is the distance between the valve spring ________ and the underside of the valve spring retainer. A)Seat B)Keepers C)Edges D)Coils

A) Seat

Flat-bottom valve lifters rotate during operation because of the ________ of the camshaft. A)Taper of the lobe B)Thrust plate C)Chain tensioner D)Bearings

A) Taper of the lobe

Technician A says that a pilot is placed into the valve guide to position the stone or cutter correctly for resurfacing the valve seat. Technician B says that he installed height should be checked and corrected with oversized valves, if needed. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that an Audi five-valve engine uses three intake valves and two exhaust valves.Technician B says that it uses three exhaust valves and two intake valves. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that cylinder head resurfacing machines include grinders and milling machines. Technician B says that cylinder head reconditioning should start with resurfacing of valves. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that mechanical cleaning with scrapers or wire brushes can be used to remove deposits. Technician B says that steel wire brushes can be used to clean aluminum parts. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that the first step in diagnosing engine condition is to perform a thorough visual inspection. Technician B says that oil leaks can be found by measuring straight up from where the oil drips on the floor. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

A) Technician A only

Technician A says that the fluorescent penetrant test method can be used to detect cracks in iron, steel, or aluminum parts. Technician B says that the dye penetrant test can only be used with aluminum parts. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that the pushrods should be rotating while the engine is running if the camshaft and lifters are okay. Technician B says that the camshaft rotates at one-quarter the crankshaft speed. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says that valve springs should be kept with the valve at the time of disassembly and tested for squareness and proper spring force. Technician B says that the exhaust valve is about 50 percent of the size of the intake valve. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

Technician A says to be sure the piston notch "front" or arrow points toward the front of the engine. Technician B says to be sure that the piston ring gaps all line up before installing the piston.. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

A) Technician A only

Two technicians are discussing a Hemi engine. Technician A says that a Hemi is an engine with ahemi-spherical shaped combustion chamber. Technician B says that all Hemi engines are cam-in-block designs. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

A) Technician A only

On a vehicle with cylinder deactivation, the valves are kept closed by deactivating the ________. A)Valve lifter B)Cam lobe C)Valve stem D)Valve spring

A) Valve lifter

Aqueous-based cleaning means ________. A)Water-based B)abrasive-based C)Strong chemical-based D)All of the above

A) Water-based

Which crack detection technique requires the use of a blacklight? A)Zyglo B)Dye penetrant C)Magnetic flux D)None of these

A) Zyglo

A DOHC V-6 has how many camshafts? A)4 B)3 C)2 D)1

A)4

Which term is used to describe the number of degrees of crankshaft rotation for which the valve is lifted off the seat? A)Duration B)Lift C)Overlap D)Underlap

A)Duration

Typical thrust bearing clearance is ________. A) 0.001 to 0.003 B) 0.002 to 0.012 C) 0.025 to 0.035 D) 0.050 to 0.100

B) 0.002 to 0.012

The PCM controls cam timing by use of ________. A)A variable spring B)A pulse width modulated (PWM) signal C)A reluctor regulator D)A variable chain tensioner

B) A pulse with modulated (PWM) signal

A good reading for a cylinder leakage test would be ________. A) Within 20% leakage between cylinders B) All cylinders below 20% leakage C) All cylinders above 20% leakage D) All cylinders above 70% leakage and within 7% of each other

B) All cylinders below 20% leakage

Many technicians always use new pushrods because ________. A)They are less expensive to buy than clean B)All dirt cannot be cleaned out from the hollow center C)They wear at both ends D)Pushrods shrink in length if removed from an engine

B) All dirt cannot be cleaned out from the hollow center

Cleaning chemicals are usually either a caustic material or an acid material. Which of the following statements is TRUE? A)Both caustics and acids have a pH of 7 if rated according to distilled water B)An acid is lower than 7 and a caustic is higher than 7 on pH scale C)An acid is higher than 7 and a caustic is lower than 7 on pH scale D)Pure water is a 1 and a strong acid is a 14 on the pH scale

B) An acid is lower than 7 and caustic is higher than 7 on pH scale

What can be used to check that the heads are at the correct angle for the intake manifold on a V-type engine? A) A metal rule B) An angle gauge C) A tape measure D) A dial indicator

B) An angle gauge

Which of these smoke types indicates excessive fuel being burned in the combustion chamber? A) Blue B) Black C) White D) Grey

B) Black

What could occur if thread sealant was not installed on the threads of a head bolt being installed in a wet hole in the cylinder block? A) Threads would not be lubricated B) Coolant would leak from around the head bolt C) Cylinder block could be cracked D) Head bolt would apply too much clamping force

B) Coolant would leak from around the head bolt

The most common cause of premature bearing failure is ________. A) Misalignment B) Dirt C) No lubrication D) Overloading

B) Dirt

A smoothly operating engine depends on ________. A) High compression on most cylinders B) Equal compression between cylinders C) Cylinder compression levels above 100 psi (700 kPa) and within 70 PSI (500kPa) of each other D) Compression levels below 100 psi (700 kPa) on most cylinders

B) Equal compression between cylinders

The proper relationship between intake and exhaust valve diameter is ________. A)Intake valve size is 85% of exhaust valve size B)Exhaust valve size is 85% of intake valve size C)Exhaust valve size is 38% of intake valve size D)Intake valve size is 45% of exhaust valve size

B) Exhaust valve size is 85% of intake valve size

Normal exhaust back pressure should be 2.5 PSI of more. A) True B) False

B) False

Engine pre-oiling is recommended for which of these reasons? A) Helps the rebuilt engine develop power B) Fills the oil passages with oil prior to initial start-up C) Both A and B D) Neither A nor B

B) Fills the oil passages with oil prior to initial start-up

A warped aluminum cylinder head can be restored to useful service by ________. A)Grinding the gasket surface and then align honing the camshaft bore B)Heating in an oven at 500°F with shims under each end, allowing it to cool, and then machining it C)Heating it to 500°F for 5 hours and cooling it rapidly before final machining D)Machining the gasket surface to one-half of the warped amount and then heating the head in an oven and allowing it to cool slowly

B) Heating in an oven at 500F with shims under each end, allowing it to cool, and then machining it

As with cranking compression, the running compression pressure at idle of all cylinders should be equal and ________ the cranking compression readings. A) Higher than B) Lower than C) The same as D) The same as or higher

B) Lower than

A cylinder deactivation system uses ________ ________ to operate the system. A)Magnetic induction B)Oil pressure C)Roller pumps D)None of these

B) Oil pressure

The camshaft makes ________ for every revolution of the crankshaft. A)One quarter revolution B)One half revolution C)One revolution D)Two revolutions

B) One half revolution

Most mechanical engine problems are caused by which of these? A) Overcooling B) Overheating C) Fuel Loss D) High RPM

B) Overheating

The type of valve in use today is a ________ valve. A)Elliptical B)Poppet C)Aluminum D)Rhodium

B) Poppet

Which of these operations should be performed first? A)Installing replacement guides B)Resurfacing the head C)Grinding the valves D)Grinding the seats

B) Resurfacing the head

To help ensure proper engine cooling, most cylinder head designs use ________. A)Long exhaust ports and short intake ports B)Short exhaust ports and long intake ports C)Large exhaust crossover passages D)Coolant passages restricted by head gaskets

B) Short exhaust ports and long intake ports

A vehicle's oil pressure warning light is on. Technician A says that the pressure sending unit should be replaced and the vehicle re-checked. Technician B says that a mechanical oil pressure gauge should be used to check the oil pressure before replacing the sending unit. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that a compression test can be used to test the condition of connecting rods. Technician B says that a cylinder leakage test fills the cylinder with compressed air, and the gauge indicates the percentage of leakage. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that a wire brush is used mainly on aluminum engine parts. Technician B says that a wire brush is used mainly on cast iron engine parts. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

B) Technician B only

Technician A says that any normal chemical can be used to clean aluminum parts or components. Technician B says that most chemical cleaners are strong soaps called caustic materials. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

B) Technician B only

Technician A says that during a power balance test, the cylinder that causes the biggest RPM drop is the weak cylinder. Technician B says that if one spark plug wire is grounded out and the engine speed does not drop, a weak or dead cylinder is indicated. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that glues are used to help gaskets seal. Technician B says that deburring all sharp edges is an important step that has to be done to achieve proper engine assembly. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that the back of all engine bearings should be lubricated during assembly. Technician B says that the face of the main and rod bearings should be lubricated before final assembly. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that the only valve guide repair option for integral valve guides is to use oversize-stem valves. Technician B says that valve guides should be checked for wear using a ball gauge or a dial indicator. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

B) Technician B only

Technician A says that the torque applied to the head bolts is the same as the clamping force on the gasket. Technician B says that the clamping force is the force actually applied to the surfaces of the gasket. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

B) Technician B only

Technician A says that valve overlap is the number of crankshaft degrees that both valves are closed. Technician B says that valve overlap is the number of degrees that both valves are open. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

B) Technician B only

The vacuum reading shown was taken from an engine at idle speed. The reading indicates that ________. A) The timing is retarded B) The engine is in good mechanical condition C) A valve is out of adjustment D) The idle speed is too low

B) The engine is in good mechanical condition

Which of these statements is TRUE about surface finish? A)Cast-iron surfaces should be smoother than aluminum surfaces B)The rougher the surface, the higher the microinch finish measurement C)The smoother the surface, the higher the microinch finish measurement D)A cylinder head should be much smoother than a crankshaft journal

B) The rougher the surface, the higher the microinch finish measurement

The movement of the camshaft lengthwise in the engine during operation is controlled by ________ between the camshaft drive gear or sprocket and a flange on the camshaft. A)Shim B)Thrust plate C)Lock washer D)Rotational compensator

B) Thrust plate

Hydraulic valve lifters can make a ticking noise when the engine is running if ________. A)Valve lash is too close B)Valve lash is too loose C)Lobe centerline is over 110° D)Both A and C

B) Valve lash is too loose

In a normally operating engine, intake and exhaust valves are opened by a cam and closed by ________. A)Rocker arms or cam follower B)Valve springs C)Lifters/tappets D)Valve guides and/or pushrods

B) Valve springs

During a dry compression test the first puff of the test shows 50 PSI and the maximum reading after 4 strokes is 150 PSI. This indicates ________. A) A good cylinder B) Weak piston rings C) A hole in the piston D) A bad spark plug

B) Weak piston rings

The low oil pressure warning light usually comes on ________. A) When an oil change is required B) When oil pressure drops dangerously low (4 to 7 psi) C) When the oil filter bypass valve opens D) When the oil filter anti-drain back valve opens

B) When oil pressure drops dangerously low (4 to 7 psi)

What other engine component may have to be machined if the cylinder heads are machined on a V-type engine? A)Exhaust manifold B)Intake manifold C)Block deck D)Distributor mount (if the vehicle is so equipped)

B) intake manifold

Variable cam timing technology is used on the exhaust cam only. 1) True 2) False

B)False

The diameter of a cylinder is called the

Bore

Technician A says that all oil galleries must be thoroughly cleaned before engine assembly can begin. Technician B says that all expansion cups and plugs should be installed with a sealer to prevent leaks. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technician A and B

Which of these is a head gasket

C)

A valve should be discarded if the margin is less than ________ inches after refacing. A)0.001 B)0.006 C)0.03 D)0.06

C) .03

A valve seat should be concentric to the valve guide to a maximum TIR (total indicator runout) of ________. A)0.006 in. B)0.004 in. C)0.002 in. D)0.0015 in

C) 0.002 in.

Never remove more material from the tip of a valve than ________ inches. A)0.001 B)0.002 C)0.020 D)3070.050

C) 0.020

Camshafts turn at which of these? A)Twice crankshaft speed B)Crankshaft speed C)1/2 crankshaft speed D)1/4 crankshaft speed

C) 1/2 crankshaft speed

If the exhaust valve opens at 57° before BDC (before dead center) and closes at 29° after TDC (top dead center), what is the exhaust valve duration in degrees? A)86 B)209 C)237 D)266

C) 266

A good engine should produce how much compression during a running (dynamic) compression test at idle? A) 150 to 200 PSI B) 100 to 150 PSI C) 60 to 90 PSI D) 30 to 60 PSI

C) 60 to 90 PSI

Valve spring inserts (shims) are designed to ________. A)Increase installed height of the valve B)Decrease installed height of the valve C)Adjust the correct valve spring installed height D)Decrease valve spring pressure to compensate for decreased installed height

C) Adjust the correct valve spring installed height

Technician A says that the paper test could detect a burned valve. Technician B says that a grayish white stain on the engine could be a coolant leak. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technician A and B

Head gasket installation is being discussed. Technician A says that the surface finish of the cylinder head or block deck is very important for proper sealing to occur. Technician B says that if "front" is marked on a head gasket, the mark should be installed near the accessory drive belt end of the engine. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says oil that pressure should be tested before installation of the engine in the vehicle. Technician B says that some cylinder heads use the torque-to-yield method, where the head bolts are tightened to a specified torque and then rotated an additional specified number of degrees. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says that a leaking head gasket can be tested for by using a chemical tester. Technician B says that a leaking head gasket can be found using an exhaust gas analyzer. Who is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says that carburetor cleaner is one of the most common cold soak agents used in an engine reconditioning shop. Technician B says that a hydroseal is a layer of water on top of the solvent to prevent evaporation. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Technician A says that engine parts need to be be cleaned before a thorough test can be done to detect cracks. Technician B says that pressure testing can be used to find cracks in blocks or cylinder heads. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Technician A says that gaskets are used to fill a space or gap between two objects to prevent leakage from occurring. Technician B says that there are many types of gaskets including cylinder head gaskets, valve cover gaskets, and timing cover gaskets. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says that pressure testing involves injecting pressurized air into engine block water and oil passages. Technician B says that one pressure testing method involves injecting heated water and a dye into engine block water and oil passages. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Technician A says that studs should be installed finger tight. Technician B says that studs must be installed using a thread locker such as Locktite. Which technician is correct? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says that the most commonly used combustion chamber types include hemispherical, and wedge. Technician B says that coolant and lubricating openings and passages are located throughout most cylinder heads. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Technician A says that the piston and rod assembly should be installed in the cylinder after being carefully fitted for each bore. Technician B says that connecting rod side clearance should be checked with a feeler (thickness) gauge. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Technician A says that valve stem height should be checked and the top of the valve ground, if necessary. Technician B says that after a thorough cleaning, the cylinder head should be assembled using new valve stem seals. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Technician A that says free and positive are two types of valve rotators. Technician B says that valve grinding should start with truing the valve tip; then the face should be refinished. Who is right? Question options: Technician A only Technician B only Both technicians A and B Neither technician A nor B

C) Both technicians A and B

Two technicians are discussing an engine with an interference design. Technician A says if a valve remains open when its cylinder reaches TDC, the piston may strike the valve. Technician B says if a valve remains open when its cylinder reaches TDC, valvetrain damage can result. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Two technicians are discussing oil leaks. Technician A says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks. Technician B says a white spray powder can be used to locate oil leaks. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Two technicians are discussing the torqueing procedure for head bolts. Technician A says that they should be tightened starting at the center of the head and working toward the ends. Technician B says that they should be tightened in three steps or according to the factory specified manner if torque-to-yield or torque-angle. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

C) Both technicians A and B

Two technicians are discussing variable valve timing. Technician A says that changing the exhaust valve timing helps reduce exhaust emissions. Technician B says that changing the intake valve timing helps increase low-speed torque. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

C) Both technicians A and B

Which part of this valve is called the valve margin?

C) C

Valve lifters are designed in which of these ways? A)Ground on one side to compensate for cam offset B)Only replaced in complete sets C)Dome shaped to assist in rotation D)Cut at an angle

C) Dome shaped to assist in rotation

Umbrella-type valve stem seals ________. A)Fit tightly onto the valve guide B)Fit on the valve face to prevent combustion leaks C)Fit tightly onto the valve stem D)Lock under the valve retainer

C) Fit tightly onto the valve stem

A coating often used to keep an engine from rusting during assembly is called ________. A) Engine oil B) Assembly lube C) Fogging oil D) Penetrating oil

C) Fogging oil

The cylinder head bolts should be tightened (torqued) by which of these sequences? A) Four outside bolts first, then from the center out B) From the outside bolts to the inside bolts C) From the inside bolts to the outside bolts D) Starting at the front of the engine and torqueing bolts from front to rear

C) From the inside bolts to the outside bolts

Where is a multilayered steel (MLS) gasket most often used in an engine? A) Valve cover gasket B) Oil pan gasket C) Head gasket D) Intake manifold gasket

C) Head Gasket

Plugging can be used to repair cracks ________. A)In cast-iron cylinder heads B)In aluminum cylinder heads C)In both cast-iron and aluminum cylinder heads D)Only in cast-iron blocks

C) In both cast-iron and aluminum cylinder heads

The valves could be bent if the timing belt breaks on which of these? A)Freewheeling engine design B)In-block cam engine C)Interference engine design D)Undersquared engine

C) Interference engine design

Which of these head gaskets is most commonly used on engine equipped with an aluminum cylinder head on a cast iron block? A) Perforated steel core B) Solid steel core C) Multilayered steel (MLS) D) Either A or B

C) Multilayered steel (MLS)

Valve stem height is most critical on which of these? A)Adjustable hydraulic lifter systems B)Adjustable solid lifter systems C)Overhead cam engines D)Non-adjustable solid lifter systems

C) Overhead cam engines

Valve ________ occurs when both valves are open at the same time at the end of the exhaust stroke and at the beginning of the intake stroke. A)Collision B)Rotation C)Overlap D)Inversion

C) Overlap

The intake valve opens at 39° BTDC (before top dead center) and closes at 71° ABDC (After bottom dead center). The exhaust valve opens at 78° BBDC (before bottom dead center) and closes at 47° ATDC (after top dead center). Which of these is correct regarding this cam timing? A)Intake valve duration is 110° B)Exhaust valve duration is 125° C)Overlap is 86° D)Both A and B

C) Overlap is 86 degrees

Most late model vehicles will use ________ as an intake manifold gasket. A) Cork B) Cork-rubber C) Plastic/rubber D) RTV

C) Plastic/rubber

A technician is performing a cylinder leak test. The leakage on all cylinders is less than 10% on all cylinders except for one, which indicates 80% leakage. What should the technician do? A) Replace the piston rings on the 40% cylinder B) Grind the valves C) Repeat the test (cylinder was not at TDC) D) Replace the head gasket

C) Repeat the test (cylinder was not at TDC)

Which of these is the most common valve spring keeper? A)Horseshoe B)Clip C)Split keepers D)Conical

C) Split keepers

Magnetic crack inspection ________. A)Uses a red dye to detect cracks in aluminum B)Uses a black light to detect cracks in iron parts C)Uses a fine iron powder to detect cracks in iron parts D)Uses a magnet to remove cracks from iron parts

C) Uses a fine iron powder to detect cracks in iron parts

On an engine with variable cam timing, the cam timing can be changed by use of ________. A)A spline cam phaser B)A vane cam phaser C)Either of these D)Neither of these

C)Either of these

The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called

Combustion

The ratio of the volume of a cylinder with the piston at BDC to the volume of the cylinder with the piston at TDC is known as the _______

Compression ratio

Which component listed below does not form part of the combustion chamber?

Connecting rod

Cylinder heads with four valves flow more air than those with two valves because they ________. A)Have a greater open area B)Use a higher lift camshaft C)Increase the velocity of the air D)Both A and C

D) Both A and C

A pyrolytic oven is used to clean parts; however, caution should be used to limit the temperature in order to prevent damaging engine parts. What are the maximum recommended temperatures? A)300° F (150° C) for all engine parts B)600° F (315° C) for aluminum parts C)800° F (425° C) for cast iron D)Both B and C

D) Both B and C

The thermostat controls what?

Controls the coolant flow through the radiator

The ____ converts the linear motion of the pistons into rotary motion

Crankshaft

Typical intake valve stem-to-guide clearance is ________. A)0.030 to 0.045 inch (0.8 to 0.10 mm) B)0.015 to 0.020 inch (0.4 to 0.5 mm) C)0.005 to 0.010 inch (0.13 to 0.25 mm) D)0.001 to 0.004 inch (0.025 to 0.076 mm)

D) 0.001 to 0.004 inch (0.025 to 0.076

About how much of the turning torque applied to a head bolt is lost to friction? A) 20% B) 40% C) 60% D) 80%

D) 80%

Abrasive pads or discs should be used ________. A)On disassembled engine parts only B)According to the specified grit size for the material being cleaned C)But clean the part thoroughly, to wash away the abrasive material D)All of the above

D) All of the above

What precautions should be followed when using gaskets? A) Never reuse an old gasket B) A gasket should be checked to be sure that it is the correct gasket C) Read the instruction sheet D) All of the above

D) All of the above

Which of these is TRUE about checking bearing clearances using Plastigage? A) The journal should be clean and oil free B) The cap should be torqued to factory specifications C) The wider the strip means the narrower the oil clearance D) All of the above

D) All of the above

Pressed-in valve ________ are used in aluminum heads A)Guides B)Seat inserts C)Springs D)Both A and B

D) Both A and B

RTV (room temperature vulcanized) cures under which of these conditions? A) At room temperature B) Moisture in the air C) Without oxygen D) Both A and B

D) Both A and B

What actually does the cleaning when using steam? A)Heat from the steam B)Pressure behind the steam C)Abrasives used D)Both A and B

D) Both A and B

A steel or copper wire used in a head gasket around the cylinder is called ________. A) Armor B) Fire ring C) Ridge block D) Either A or B

D) Either A or B

All of these are procedures that can help a service technician to diagnose engine faults, EXCEPT ________. A) Vacuum test B) Compression test C) Cylinder leakage test D) Fuel level test

D) Fuel level test

Service information states SAE 30 engine oil should be used on the threads of the head bolts, before installation and torquing. Technician A says that SAE 5W-30 will work. Technician B says that SAE that 10W-30 will work. Who is right? A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

D) Neither technician A nor B

Technician A says that all valves rotate to help prevent the valves and seats from burning. Technician B says that positive type valve rotators are only used on intake valves. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

D) Neither technician A nor B

Technician A says that an attendant must be present any time a pyrolytic oven is used. Technician B says that aluminum parts should be cleaned at a temperature greater than 600 deg F. Which technician is correct? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

D) Neither technician A nor B

Technician A says that the exhaust valve is larger than the intake valve to ensure that all the exhaust gases leave the cylinder. Technician B says that the exhaust valve is larger than the intake valve to ensure proper heat dissipation. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

D) Neither technician A nor B

Technician A says that the intake valve runs hotter than the exhaust valve because the intake valve has the greater surface area. Technician B says that the exhaust valves usually do not burn due to the scavenging effect of the exhaust stream. Who is right? A)Technician A only B)Technician B only C)Both technicians A and B D)Neither technician A nor B

D) Neither technician A nor B

Turning the oil pump before starting the engine should be done for all of these reasons, EXCEPT ________. A) Lubricate engine bearings B) Lubricate valve train components C) Supply oil to the camshaft D) To get the distributor in the right position

D) To get the distributor in the right position

The TTY method of tightening bolts involves which of these processes? A) Turning all bolts the same number of turns B) Torqueing to specifications and loosening by a specified number of degrees C) Torqueing to one-half specifications, then to three-quarter torque, then to full torque D) Turning bolts a specified number of degrees after initial torque

D) Turning bolts a specified number of degrees after initial torque

Which of the following is the LEAST LIKELY to cause an engine noise? A) Carbon on the pistons B) Cracked exhaust manifold C) Loose accessory drive belt D) Vacuum leak

D) Vacuum leak

If lift and duration remain constant and the lobe center angle decreases, then ________. A)Valve overlap decreases B)Effective lift increases C)Effective duration increases D)Valve overlap increases

D)Valve overlap increases

All of these are correct except

Engine produces higher horsepower at higher altitude

Which of the following is the most correct statement about the direction of engine rotation

Most engines rotat clockwise as viewed from the front of the engine

How many rotations of the cranksahft is required to complete each stroke of a four-stroke cycle engine?

One-half

Which Component is not needed in a typical overhead cam engine?

Push Rod

Tech A changing connecting rod length changes the engine stroke. Tech B says that changing connecting rod length changes the position of the piston in the cylinder

Tech B

Horsepower is expressed in unites of

foot-pounds

Torque is expressed in units of

pound-feet

Identify

roller lifter