Engine Fundamental

In a serpentine belt system, the pulley edges should be within ________ of alignment with each other

1.6 mm

Simple distillation of crude oil was the only commercial refinement process until the early ______, and the bulk of commercial oil products on the market are still produced by this process, such as conventional engine oils

1970s

When you take the vehicle for a test drive after reinstalling the engine, what speed should the vehicle not exceed for the first 30 minutes?

50 mph

Straightening a cylinder head is usually performed by bolting the head down to a straightening plate with shims placed between the head and the plate so that the head will be under tension. Then the cylinder head is heated up no more than ____ and allo

500°F

What needs to be checked for if a vacuum fill method of filling the cooling system was used?

Air pockets in the system

__________ an engine ensures that there is a consistent combustion pressure on the crankshaft between cylinders.

Blueprinting

Tech A states that the small end of a connecting rod is considered as a reciprocating mass in the engine. Tech B states that the big end of a connecting rod is considered more of a rotational mass.

Both A and B

Technician A says that some engines do not use cover gaskets as they are sealed using RTV. Technician B states the use of rubber style of gaskets on newer vehicles is becoming common place as they do not leak as much as paper gaskets. Who is correct?

Both A and B

Technician A says the ridge at the top of the cylinder is too big if after the carbon has been scraped off it catches a fingernail. Technician B says that if the ridge is significant, and you plan to reuse the pistons, you will need to remove the ridge with a tool called a ridge reamer. Who is correct?

Both A and B

Two technicians are discussing a cracked cast iron head. Technician A says that some cracks can be welded successfully. Technician B says that some cracks can be repaired by pinning them. Who is correct?

Both A and B

The opening and closing of the valves is controlled by the _______.

Camshaft lobe

The ________ is/are best measured with a dial indicator and set of "V"-blocks

Camshaft warpage

If the piston skirt measurement is smaller than that taken at the pin measurement area, then the piston has a ________ skirt and the piston will need to be replaced.

Collapsed

Coolant absorbs the heat from the engine by ________

Convection

Which of the following is LEAST likely to be found in the oil pan of an engine being disassembled?

Core plugs

Performing a _______ can help determine whether to perform a radiator repair or to buy a new radiator.

Cost analysis

Which of these is used when the crack in a cylinder head is in an easy place to deal with and when there will be no issues with internal water jacket when the process is carried out?

Crack welding

When removing a main bearing cap, the lower half of the main bearing inserts may come away with the cap as you remove it, or they may stick to the ________ journal.

Crankshaft

Which of the following statements is true with respect to removing and replacing a thermostat?

Drain at least 50% of the coolant to avoid spills.

What can potentially cause the engine to bend the valves when a timing belt is used?

Failure of the tensioner

All of the following statements regarding the operation of a multi-grind camshaft are true, except:

Fuel economy and performance are reduced when using multi-grind camshafts.

Which of the following is a clamp that can be adjusted using a nut driver?

Gear clamp

In a ________ oil pump, the driving gear meshes with a second gear.

Geared

The _____ consists of many air doors, which are plastic or metal flaps that seal off parts of the air box to control airflow

Heater box

All of the following statements with respect to the pinning process of crack repair are true, except:

Holes are also drilled in between the cracks so as to be filled with pins.

Engine heat is transferred from _____ components to _____ ones.

Hotter; cooler

In an L-head (flat head) engine design, where are the valves located?

In the block, off to one side of the cylinder

Choose the correct statement with respect to reinstalling the engine in vehicles equipped with automatic transmissions:

It is a good idea to consider changing the front transmission seal while the torque converter is removed.

Which of the following tools helps in deciding whether the camshaft should be replaced?

Micrometer

Tech A states that the piston, piston pin, and ring set must be measured together. Tech B states that the pin and ring set can be adjusted. Who is correct?

Neither A nor B

Technician A says that a technician can do his or her own balancing with a small scale. Technician B states that normal engines do not need to be balanced at all. Who is correct?

Neither A nor B

Technician A says that valve overlap is where the valves run into one another. Technician B states that duration is the amount of time combustion takes to occur. Who is correct?

Neither A nor B

Technician A says a timing chain should be replaced at regular intervals. Technician B says that using the wrong oil will have no effect on the timing chain. Who is correct?

Neither technician

Technician A says that a crankshaft that is internally balanced is measured with a harmonic balancer or a flywheel/flex plate installed. Technician B says that an externally balanced crankshaft is measured without a harmonic balancer or a flywheel/flex plate installed. Who is correct?

Neither technician

Technician A says that cylinder deactivation occurs when the engine is not running. Technician B says that the system operates separately from the PCM. Who is correct?

Neither technician

Technician A says that timing cannot be changed when the engine is running. Technician B says that cylinders cannot be de-activated on an engine that is running. Who is correct?

Neither technician

________ is a surface hardening heat treatment that introduces nitrogen into the surface of steel at a temperature range of approximately 930°F to 1,020°F (499°C to 549°C).

Nitriding

Choose the correct statement:

Overhead cam engine is used to simplify the valve train.

Which of these should be used to check the bearing clearance with the crankshaft installed?

Plastigage

After the engine has been given a proper break in, the oil level is inspected and the level is found to be higher and milky in appearance. What is this an indication of?

Possible internal coolant leak

When reinstalling an engine to a manual transmission, the transmission input shaft does not slip into the clutch disc splines, although a clutch alignment tool was used when installing the disc. Which of the following steps will help correct this problem?

Putting the transmission in gear and turning the output shaft.

Most manufacturers recommend the use of ________ to scrape aluminum surfaces.

Roloc™ bristle disc

The ______ is essentially the engine block of the rotary engine.

Rotor housing

Tech A states that a baked gasket must be carefully scraped from the surface without causing scratches on the sealing surface. Tech B states that metal gasket scrapers must not be used when working with cast iron. Who is correct?

Tech A

Technician A says that the machinist picks the method that should be used to check out a set of cylinder heads that were dropped off for inspection. Technician B says that the technician tells the machinist which method to use to check a set of cylinder heads. Who is correct?

Tech A

Technician A says that crankshafts are balanced by either drilling out weight or adding more weight. Technician B says that crankshafts are only balanced in the rotational plane. Who is correct?

Technician A

Technician A says that special oil is used for a premix oil system. Technician B says that any multi-viscosity oil can be used with a two-stroke premix system. Who is correct?

Technician A

Technician A says that the surface area of the radiator is increased by adding fins to the tubes. Technician B says that the materials used to make radiators have to be good insulators. Who is correct?

Technician A

Technician A says that timing belts are always located in the front of the engine. Technician B says that some timing belts are located in the rear of the engine. Who is correct?

Technician A

Technician A says that when the lifter is on the base circle of the cam lobe, the valve is closed. Technician B says that the valve has a small amount of clearance when the valve is fully open. Who is correct?

Technician A

Technician A states that before starting a repair or service task on the cooling system, one should allow sufficient time for the system to cool adequately before opening the pressurized system. Technician B states that presence of coolant does not impact the replacement of the thermostat. Who is correct?

Technician A

To begin cylinder head component reassembly, Technician A says valve stems should be coated with clean engine oil or engine assembly lubricant before installing the valves. Technician B says only the valve stem seals need to be lubricated for reassembly. Who is correct?

Technician A

Two technicians were discussing the installation of various plugs into the heads and block. Technician A said "When installing gallery plugs and soft plugs, you should apply the appropriate sealer to both." Technician B says "always install any plugs clean and dry." Who is correct?

Technician A

Technician A says that main and rod bearings are glued in place with special bearing cement. Technician B says that main and rod bearings are held in place by a precise amount of "bearing crush." Who is correct?

Technician B

Technician A says that to remove the rod caps on an engine, typically start by positioning the number 3 piston at top dead center. Technician B says that to remove the rod caps on an engine, typically start by positioning the number 1 piston at bottom dead center. Who is correct?

Technician B

When discussing intake and exhaust port designs, Technician A says larger ports will increase an engine's torque at low engine speeds. Technician B says larger ports will increase torque at high engine speeds. Who is correct?

Technician B

When reinstalling a repaired engine, Technician A says all components and fasteners should be installed starting at the bottom and working up. Technician B says the exhaust pipes must be aligned with the manifolds or headers as the engine is lowered into place on some models. Who is correct?

Technician B

Any threaded plugs, such as the rear oil gallery plugs, should be coated with a sealer, preferably a liquid ________ or a similar nonhardening sealer.

Teflon

What is flame propagation?

The movement of the flame front away from the spark plug across the combustion chamber

All of the following statements with respect to balancing and blueprinting are true, except:

They help the driver to drive without much effort.

Which of the following is typically the last main bearing cap to torque when assembling a crankshaft?

Thrust bearing cap

Engine machining is performed any time the ________ of an engine component must be adjusted by adding or removing material.

Tolerances

All of the following statements with respect to thrust bearing are true, except:

Usually the thrust bearings are located in the foremost bearing.

The oil analysis report lists physical properties such as ________, condensed water, fuel dilution, antifreeze, acids, metal content, and oil additives.

Viscosity

Choose the correct statement with respect to crack welding:

Welding is done on castings that have enough material to sustain the weld and survive the experience.

The oil additive that reduces the effect of oil churning in the crankcase is known as a(n

antifoaming agent.

If a vacuum fill method of filling the cooling system was used, the cooling system will ________

be full

An overflow tank is used to:

catch coolant that is released by the radiator cap when the coolant heats up

The outward force that is exerted on a rotating body is known as:

centrifugal force.

The passages that oil passes through to get to different parts of the engine are called oil:

galleries.

If the engine is not starting:

increase the fuel level.

The main benefit of using roller rocker arms in the valve train is:

reduced friction and wear.

A camshaft follower performs the same function as a:

rocker arm.

All of the following damages are to be inspected in a timing belt, except:

swaying.

A crescent oil pump is mounted to

the front of the engine

The main issue with a timing gear, due to its design, is:

the noise.

A set of __________ is used instead of a belt or chain to allow for an indefinite service life.

timing gears

A Welch plug is a:

type of soft, round metal disc pressed into the engine block to plug water jackets or passageways.

Down-flow radiators

use tanks on the top and bottom.