Crankshaft Assembly and Pistons Module

Question 1

True or False;
Four stroke 6 cylinder engines should have 60 degrees between power strokes.

Answer 1

False

720/6=120

Question 2

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

Answer 2

True

Question 3

What is the purpose of a crankshaft?

Answer 3

To change reciprocating motion into rotary motion

Question 4

Crankshaft journal fillets must be maintained to:

Answer 4

Prevent crankshaft breakage

Question 5

What is mounted onto the flywheel to aid in starting purposes?

Answer 5

A ring gear

Question 6

A harmonic balancer that has an interference fit should be removed using?

Answer 6

A Puller

Question 7

Another name for friction bearings used in engines is?

Answer 7

Precision Inserts

Question 8

Localized(Spot) wear on a bearing is likely caused by?

Answer 8

Foreign material between the bearing shell and bearing bore.

Question 9

When installing bearings, you should not lubricate what part?

Answer 9

The bearing backs

Question 10

When removing main and/or connecting rod bearings, you should mark them for;

Answer 10

Reinstallation
Future analysis

Question 11

Plastigauge is?

Answer 11

Pliable plastic string

Question 12

What are the 4 main components of a piston and connecting rod assembly?

Answer 12

Connecting Rod
Piston
Piston rings
Piston Pin

Question 13

What is the purpose of a connecting rod?

Answer 13

It forms a link between the piston and the crankshaft, that transmits the force of combustion

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;
Aluminium pistons are fitted tighter than cast iron pistons.

Answer 15

False
Aluminium expands more than cast iron.

Question 16

True or False;
Drilled holes in the pistons oil groove drains oils back to the crankcase.

Answer 16

True

Question 17

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

Answer 17

False - the dots face the pressure

Question 18

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

Answer 18

False - must be staggered to prevent leakage

Question 19

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

Answer 19

True

Question 20

True or False;
Keystone, or Trapezoidal rings are self cleaning.

Answer 20

True