Engine Flashcards
Alkaline cleaners will remove rust and scale.
‘False’.
Technician A says that an air-fuel mixture that is too lean can cause burned internal engine parts. Technician B says an overly rich mixture can cause oil wash from cylinder walls. Which technician is correct?
Both technicians
Technician A says to avoid lubrication on the thrust bearing surfaces. Technician B says when installing main bearing caps, tap them with a ball peen hammer to insure they seat properly. Who is right?
Nether technician
Technician A says that the top compression ring groove wears more than the other ring grooves. Technician B says that full floating, piston pin lock rings should be installed with their openings facing up. Who is correct?
Technician A
During a compression test, a cylinder shows lower readings than expected. Technician A squirts a tablespoon of oil into the cylinder and the compression raises. He says this indicates a problem with the rings. Technician B says this indicates a burned intake valve. Which technician is correct?
Technician A
All of the below are causes of thrust bearing failure, EXCEPT _____.
a correctly installed rope seal
The tenth digit of the VIN code will identify the engine size.
False
A flexplate is used with a manual transmission.
False’.
All of the following are used for chamfering a cylinder EXCEPT a _____.
diamond hone
Technician A says that it is alright to disconnect the air conditioning lines and drain the refrigerant in a pan. Technician B says that certification is required to operate a refrigerant recycling machine. Who is right?
Technician B
Technician A says that to identify a vehicle all you need to know is the make and model. Technician B says that the VIN code can be found in the owner’s manual. Who is right?
Neither technician
Most of today’s cars are powered by _____-cycle engines.
Otto
The first oil change on a rebuilt engine should be performed at
Answer
miles.
500
Technician A says some manufacturers recommend head bolts going into a coolant passage be sealed with liquid thread sealant. Technician B says RTV stands for right torque value. Who is correct?
Technician A
Without protective gloves, it is possible for acid from your hands to etch engine bearings.
True’.
Two technicians are discussing “blowby.” Technician A says that “blowby” is gases escaping past the valves. Technician B says that “blowby” is gases escaping past the rings. Which technician is correct?
Technician B
Undersize bearings have a thinner bearing back.
False’.
Ring gaps on an opposed engine design should be faced down.
False’.
Technician A says a hot spray washer is sometimes called a jet washer. Technician B says an advantage of a spray washer is that it cleans oil galleries as well as a hot soak tank. Who is right?
Technician A
Automobile piston pins are either pressed fit or full floating.
‘True’.
Some main bearings have dowels that must fit into a hole in the block.
‘True’.
Of the measuring devices listed below, which is the most accurate in measuring cylinder bore size?
cylinder dial bore gauge
Technician A says the rotating end of the connecting rod is the big end. Technician B says the reciprocating end of the connecting rod is the big end. Who is correct?
Technician A
Technician A says grounding out a plug wire to a cylinder with a cracked piston will can increase the noise. Technician B says a rod knock will become quieter as its cylinder is grounded. Who is correct?
Both technicians
The camshaft controls the rate at which the engine breathes.
True’.
Technician A says that most automotive gasoline engines have four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four-stroke cycle. Which technician is correct?
Technician A
Technician A says that a good piston can be ruined by cleaning the grooves on a wire wheel. Technician B says an old, broken piston ring works well to clean the ring grooves. Who is right?
Both technicians
Two technicians are discussing engines. Technician A says that a long block is a short block with the addition of the cylinder heads. Technician B says that the term “short block” refers to the engine’s displacement. Which technician is correct?
Technician A only.
Technician A says the click-type torque wrench is best because it is the most accurate. Technician B says that an inch-pound torque wrench should be used when measuring smaller torque values. Who is correct?
Technician B
Oil consumption problems are being discussed. Technician A says a lack of regular services can cause the oil control rings to plug. Technician B says worn compression rings can cause oil consumption problems. Who is correct?
Both technicians
The gasoline engine is also known as a spark ignition engine.
True’
How many degrees is a complete cycle on a four stroke engine?
720
Technician A says powder forged rods are not cut; they are fractured (broken). Technician B says some rods have a spit hole to lubricate the cylinder walls at lower rpms. Who is right?
Both technicians
Technician A says that valvetrain noise will occur at half the speed of engine rpm. Technician B says valvetrain noises coming from inside the timing cover can be caused by a bad timing chain or chain guide. Which technician is correct?
Both technicians
Technician A says that during engine disassembly, all main and rod bearings should be kept in order in case they will be reused. Technician B says that there is no need to keep bearings in order if new parts are to be used. Who is right?
Technician A
Most oval wear on a cylinder is away from the major thrust side.
False’.
On an engine with a standard transmission, insure the flexplate is installed correctly.
‘False’.
An ultrasonic thickness gauge is used to check cylinder wall thickness.
‘True’.
Engine operation is being discussed. Technician A says preignition can cause engine damage. Technician B says carbon deposits on the pistons can increase the compression ratio. Who is correct?
Both technicians
A heli-coil is a thread repair device.
‘True’.
During engine removal with an automatic transmission, the torque converter stays with the engine.
‘False’.
How fast does the crankshaft rotate in relationship to the camshaft?
Twice as fast
Most of today’s automotive pistons are slipper skirt pistons.
‘True’.
Piston rings are made from all these materials, EXCEPT _____.
aluminum wire
Hypereutectic is the description of a popular cast aluminum alloy referring to the percentage of silicon in the aluminum in a piston.
True’.
Technician A says a faulty head gasket can cause the oil to mix with coolant. Technician B says bubbles forming in the coolant during engine operation could indicate a leaking head gasket. Which technician is correct?
Both technicians
Technician A says that there is a correct sequence to follow when removing head bolts. Technician B says that when a cylinder wears, a ridge forms at the bottom of the cylinder. Who is right?
Technician A
Technician A says that all vehicles have vacuum diagrams under the hood and there is no need to mark the vacuum lines. Technician B says that for late model vehicles, microfiche will have all the information you need to rebuild the engine. Who is right?
Neither technician
The engine has to be removed to replace a one piece rear main (crankshaft) oil seal.
‘True
A feeler gauge is used to measure mechanical valve lash.
True’.
While discussing an in-vehicle engine repair, Technician A says that sometimes the engine mounts need to be loosened to remove the oil pan. Technician B says that sometimes the oil pump must be unbolted in order to remove the oil pan. Who is right?
Both technicians
Technician A says to label the core plugs as they are removed so they can be reinstalled. Technician B says to remove the core plugs before hot tanking the block. Who is correct?
Technician B
Technician A says excessive drive belt tension can cause wear on the upper, front main bearing. Technician B says maintaining proper oil clearance and a lower viscosity oil will increase the fatigue life of a bearing. Who is right?
Technician A
The engine should be cold before removing the head.
‘True’.
After glaze breaking or cylinder honing, clean the block with _____.
hot soapy water
Technician A says a piston usually has a direction identifying notch that faces the rear of the engine. Technician B says a piston exhibits more wear on its major thrust side. Who is right?
Technician B
Two technicians are discussing the power stroke. Technician A says that on a V8 engine, a power stroke occurs every 90 degrees. Technician B says that on an inline six-cylinder engine, the power stroke occurs every 120 degrees. Which technician is correct?
Both technicians
A full skirt piston used on longer stroke engines is known as a(n) ____ piston.
trunk
The purpose of the harmonic balancer is to____________.
Absorb the twisting of the crankshaft.
What cylinder number is the closest to the front of the engine on almost all V-type engines?
1
