Engine Component Identification and Repair Self-Test

Question 1

True or False;
The engine flywheel should be pinned and locked out before entering the crankcase.

Answer 1

True

Question 2

True or False;
An underslung crank has the main bearing caps at the bottom of the crank.

Answer 2

True

Question 3

True or False;
Maximum deck warpage of a block is checked with a straight edge and dial gauge.

Answer 3

False

Question 4

True or False;
Cylinder liners on large engines may be repaired by hard chroming and grinding to size.

Answer 4

False

Question 5

True or False;
Worn or scored cylinder liners affect engine performance and oil consumption, and lead to increase in crankcase pressure.

Answer 5

True

Question 6

True or False;
Aluminum pistons are fitted tighter than cast iron pistons.

Answer 6

False

-fitted looser as aluminium has greater thermal expansion properties over cast iron

Question 7

True or False;
Cam ground aluminum pistons measured at room temperature are out-of-round.

Answer 7

True

Question 8

True or False;
Drilled holes in the piston’s oil ring groove drains oil back to the crankcase.

Answer 8

True

Question 9

True or False;
Rings are installed with the dot, notch, or number toward the crankshaft.

Answer 9

False

Dot faces up(towards pressure)

Question 10

True or False;
Ring gaps should be lined up one above the other prior to piston installation

Answer 10

False

module; stagger ring end gaps so gaps are 180 degrees apart from each other

Question 11

True or False;
A ring should be able to recede into the ring groove by its full radial thickness.

Answer 11

False

Question 12

True or False;
Oil control rings depend only on their expanders to maintain contact with the cylinder walls.

Answer 12

True

Question 13

True or False;
Advancing a nut 120° after 50 lb-ft torque is called the torque turn method.

Answer 13

True

Question 14

True or False;
The connecting rod bearing clearance can be checked by the lift check method.

Answer 14

True

Question 15

True or False;
After torquing the connecting rod bolts the rod should be checked for adequate side clearances.

Answer 15

True

Question 16

True or False;
Crankshafts should be stored by standing them on end, or on a level floor on “V” blocks for larger crankshafts

Answer 16

True

Question 17

True or False;
Four stroke six cylinder engines should have 60° between power strokes.

Answer 17

False

720/6=120

Question 18

True or False;
The cam lobe opens the valve; the valve spring forces the valve closed.

Answer 18

True

Question 19

True or False;
The best method of checking a cylinder head for coolant leaks would be to use the hot water and pressure method.

Answer 19

True

Question 20

True or False;
A valve seat ground too wide will cool the valve better but will trap carbon.

Answer 20

True

Question 21

True or False;
The greatest degree of wear on the cylinder liner is on the top of the ring travel 90° to the crankshaft.

Answer 21

True

Question 22

True or False;
Liner cavitation is caused by air getting into the cooling system.

Answer 22

False

vibration I think?

Question 23

True or False;
Valve overlap occurs when both the intake and exhaust valves are open and the piston is near TDC.

Answer 23

True

Question 24

True or False;
The purpose of the flywheel is to keep the engine in balance.

Answer 24

False

-keep the engine running smooth

Question 25

True or False;
When you have a camshaft gear on a four-stroke engine with 42 teeth, the crankshaft will have 24 teeth.

Answer 25

False

Question 26

True or False;
A valve bridge is used on many industrial engines because two valves can be opened with one cam lobe.

Answer 26

True