Deck 49: Diagnosing Engine Mechanical Problems

Question 1

____________________ occurs when oil is washed from cylinder walls.

Answer 1

Oil wash

Question 2

Which of the following would LEAST-Likely be used to check for internal air leaks before the engine is disassembled?

A)Smoke test
B)Cranking vacuum test
C)Compression test
D)Propane test

Answer 2

C

Question 3

Internal leaks are those that are enclosed within the ____________________.

Answer 3

engine

Question 4

While having a discussion, Technician A says that according to the Ford Motor Company, there are approximately 36,500 drops of oil in 1 quart. Technician B says that according to Ford, there are approximately 16,500 drops of oil in 1 quart. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 5

All of the following statements are true EXCEPT:

A)accessories often cause noises that can be mistaken for other problems.
B)a fan clutch on a coolant pump can cause a noise that sounds serious and is hard to pinpoint.A stethoscope can be used to listen to the noise.
C)to isolate noises from defective belt-driven parts or accessories, disconnect the drive belt and run the engine for a short time at idle.
D)belts are a common source of noise.

Question 6

The condition that will MOST-Likely intensify noise caused by excessive rod side clearance is:

A)cracked piston
B)spark knock
C)flat cam
D)broken ring

Question 7

When a starter motor will not crank the engine over and the engine cannot be turned over by hand, this is called a(n) ____________________.

Question 8

A valve job increases compression, but it also increases ____, which can cause more oil to be sucked past the worn piston rings into the combustion chamber.

A)engine vacuum
B)engine knock
C)oil wash
D)piston slap

Question 9

The part that is MOST-Likely to be a good indication of what is taking place in a cylinder is the:

A)piston ring
B)head gasket
C)spark plug
D)valve

Question 10

All of the following statements are true EXCEPT:

A)crankshaft noises are generally deeper in pitch than other engine noises.
B)excessive front main bearing clearance results in a heavy knock after the engine warms up.
C)piston slap is the movement of the crankshaft in a forward and backward direction.
D)excessive end thrust will cause a clunk when the vehicle leaves a stop sign.

Question 11

One effective way to test for hard-to-find oil leaks is to use a ____.

A)passive sensor
B)thermistor
C)monitor
D)black light

Question 12

When looking for a cause for oil consumption, technicians will often check an engine's ____________________.

Question 13

When engine oil has not been regularly changed, thick, dirty oil can plug the oil return holes in the cylinder head.

Question 14

While having a discussion, Technician A says that a rear main bearing seal leak is indicated when there is oil on the transmission side of the torque converter. Technician B says that a rear main bearing seal leak is indicated when there is oil on the engine side of the flywheel or torque converter. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

On a rebuilt engine with relatively low mileage, oil leakage past the valve guide seals is a more likely cause of oil consumption than leakage past piston rings.

Question 16

Internal oil consumption can sometimes be spotted as an oily coating on the inside of the exhaust pipe.

Question 17

Water leaking into the crankcase will contaminate the oil. This is called ____________________.

Question 18

Internal leaks are diagnosed using the compression tester.

Question 19

Which of the following is LEAST-Likely the cause of compression loss?

A)Engine knock
B)Broken piston rings
C)Blown head gasket
D)Burned valves

Question 20

A leaking head gasket will always show up on a pressure test.

Question 21

Why do valve train noises occur at half the speed of engine crankshaft rpm?

Question 22

How would you test for a cracked flexplate?

Question 23

In which locations can internal leaks occur?

Question 24

What are the possible causes of lifter noise?

Question 25

Why should you properly diagnose an engine before disassembly?