NWCC Mr. Miller: Engine Repair SG
Special coolants are required on most hybrid vehicles as the coolant cools the engine and inverter assembly.
TRUE
The hemispherical combustion chamber provides excellent turbulence to the air and fuel mixture.
TRUE
After the combustion of the air/fuel mixture, the inner edges of the cylinder head gasket are exposed to approximately ____________ psi of pressure.
1,000
When must a thermostat be fully opened?
20 Degrees F, above the the "start to open temperature"
Technician A says that the American Petroleum Institute has established an oil viscosity classification system. Technician B says thick viscosity oils receive high rating numbers. Who is correct?
A Only
Technician A says the maximum amount of cylinder out-of-roundness allowed in most cases is 0.0015 inches (.038mm). Technician B says that a cylinder can have a taper of up to 0.010 inches (.254mm) and be acceptable. Who is correct?
A only
Which of the following is a function of the engine's lubrication system?
All answers are correct
Two technicians are discussing the installation of segmented (three piece) oil control rings. Technician A says the ends of the expander/spacer (middle piece) must overlap. Technician B says that says that the end gaps of all three pieces must be evenly spaced apart. Who is correct?
B only
The thermostat is installed with the temperature sensor ( wax pallet) facing toward the ___________.
Block
_______________ is a term used to describe the gases that escape the combustion chamber and enter the crankcase.
Blowby
Hemispherical combustion chambers are being discussed. Technician A says the flame path from the spark plug to the piston head is short, which provides efficient burning. Technician B says cross-flow arrangement of the inlet and exhaust valves allows for a relatively free flow of gases in and out of the chamber. Who is correct?
Both A and B
Technician A check crankshaft endplay or end clearance with a feeler gauge. Technician B uses a dial indicator. Who is correct?
Both A and B
Technician A rotates the engine by hand until all the cam timing marks align to ensure that the cam timing was set properly. Technician B moves the belt tensioner pulley to remove its tension on the belt before removing the timing belt. Who is correct?
Both A and B
Technician A says multivalve engines can have three valves per cylinder. Technician B says multivalve engines can have five valves per cylinder. Who is correct?
Both A and B
Technician A says some seals are designed to keep oil from escaping around a rotating shaft. Technician B says some seals are used to prevent fluid leaks between two fairly rigid flanges. Who is correct?
Both A and B
Technician A unbolts the A/C compressor from its bracket and re-positions it so that the engine can be removed without disconnecting the A/C hoses. Technician B captures the refrigerant using a reclaimer/recycling machine before removing A/C hoses from the compressor, then plugs the the lines and connections at the compressor. Who is correct?
Both A and B
Technician A uses a micrometer to measure the connecting rod journal for taper. Technician B uses a micrometer to measure the connecting rod rod journal for out-of-roundness. Who is correct?
Both A and B
Technician A uses chalk mark to index the position of the rear U-joint and pinion flange. Technician B, when removing drive axles, scribes marks on the suspension and steering parts to ensure that the wheel alignment will be close after reassembly. Who is correct?
Both A and B
Technician A washes parts to remove the ash from them after they have been cleaned in a thermal cleaning oven. Technician B uses shot blasting to remove ash from parts after they have been cleaned in a thermal cleaning oven. Who is correct?
Both A and B
Two technicians are discussing gasket installation. Technician A says if sealant is applied to a gasket designed to be installed dry, the gasket may leak. Technician B says if sealant is required, it will be included in the box with the gasket. Who is correct?
Both A and B
Two technicians are discussing oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter does become plugged, oil can flow directly to the bearings. Who is correct?
Both A and B
The connecting rod journal is also called the_______________?
Crank Pin
A thrust plate is sometimes used to limit the fore and after movement (endplay) of the _____________.
Camshaft
Caustic soda is a strong detergent that is commonly found in solvent and is effective in removing ______________.
Carbon
Water pumps are _________ type pumps?
Centrifugal
A ___________ cooling system has an expansion tank or recovery tanks.
Closed
Which of the following is NOT a core plug design?
Contraction-type
Each half of a split bearing is made so that it is slightly greater than an exact half. Whats is this extension called?
Crush
Which of the following tools can be used to test the operation of the thermostat without removing it from the engine?
Digital infrared thermometer
A damaged bolt should be___________?
Discarded
Most oil pressure gauges are _______________ controlled.
Electrically
A voltmeter is used to check the cooling system for ___________________.
Electrolysis
A damaged threaded hole in an aluminum block should be repaired by using a bottoming tap of the correct size.
FALSE
A pressure relief valve, located inside the oil filter, is designed to limit engine oil pressure.
FALSE
A torque-to-yield bolt can be reused if its not damaged.
FALSE
A typical oil pump pickup filter screen serves to keep microscopic contaminants from reaching the oil pump.
FALSE
All head bolts in an engine are the same length.
FALSE
Prior to adding oil, a freshly rebuilt engine should be cranked for thirty seconds to enable the crankshaft and rod bearings to wear in.
FALSE
Sludge and metal shavings inside the pan are normal and can be disregarded.
FALSE
The radiator cap should be removed only when the engine is at full operating temperature.
FALSE
Tightening a bolt should be done with an impact wrench followed by a torque wrench.
FALSE
RTV Silicone sealing products are also known as ______________ gasket products.
FIP
The surface of a valve that comes into contact with the valve seat is called the valve _______________.
Face
An engine that has enough clearance between the piston and valves so that it will not bend the valves if the timing belt breaks is called an ______________ engine.
Free Wheeling
The holes in the cylinder block that allow the removal of sand used in the casing process are sealed by____________.
Freeze Plugs
Engine oil passages are often referred to as oil ways or _______________.
Galleries
Never use a ___________ drying sealant (such as shellac) on gaskets.
Hard
A vibration damper is often called an ____________ balancer.
Harmonic
Hub, inertia ring, and elastomer (rubber) sleeve are parts of a___________?
Harmonic Balancer
The first step of an engine disassembly usually the removal of ___________ and ____________ manifolds.
Intake and Exhaust
The distance between the valve face and the head of the valve is called the __________________.
Margin
Most camshafts on overhead valve engines use ________ piece bearings.
One
Gasket material must be able to seal valve covers that are made from steel, aluminum, and _____________.
Plastic
Using a _______________ is the best method of prelubricating most modern engines.
Prelubricator
A lifter that has a concave contact face must be ___________.
Replaced
Installed valve spring height can be adjusted with _____________.
Shims
Parts washers are often called _________________ tanks.
Solvent
The flywheel bolts should be loosened in a __________ pattern.
Star
A major advantage of cleaning ovens is that they are a more environmentally acceptable process than chemical cleaning.
TRUE
A used roller lifter can be installed on a new camshaft.
TRUE
After the head has been resurfaced on an OHC engine, a stackable multilayer aftermarket head gasket can be used to restore proper cam timing.
TRUE
Aluminum blocks normally have sleeves or steel liners placed in them to serve as cylinder walls.
TRUE
Aluminum cylinder heads weigh roughly half as much as cast-iron heads.
TRUE
Aluminum expands and contracts almost twice as much as cast iron in response to temperature changes.
TRUE
ECD (ElectroChemical Degradation) usually occurs within two inches of the hose end - not in the middle.
TRUE
Nearly all OHV engines use a timing chain to drive the camshaft.
TRUE
Old core and oil galley plugs are normally removed and replaced as part of cylinder block reconditioning.
TRUE
On some OHC engines, the camshaft's must be removed to adjust the valves.
TRUE
Resurfacing a cylinder head gasket surface may alter the combustion chamber volume.
TRUE
The lobes of a camshaft designed for use with flat bottom lifters are slightly tapered. The taper causes the lifter to rotate in its bore.
TRUE
To protect against scuffing and wear, some valves have coatings of black nitride applied to the valve stem.
TRUE
Water pump failure can be caused by a bent fan blade.
TRUE
Anaerobic sealant can be used for ______________ as well as gasketing.
Thread Locking
____________ is a very rapid movement of gases that causes air and fuel to mix better and improve combustion.
Turbulence
Which cleaning method uses high-frequency sound waves to create microscopic bubbles that loosen dirt from parts?
Ultrasonic