201E - Piston, Piston Rings and Connecting Rod Service

Question 1

What tool is used to prevent piston and ring damage when installing and removing piston rings?

Answer 1

Ring expander

201E pg. 6

Question 2

If a piston pin has a slight interference fit with the pin bore at room temperature, what should be done to remove the pin?

Answer 2

Submerge the piston in 100C water for several minutes.

201E pg. 9

Question 3

When bead blasting pistons, what areas should be protected from the blasting material?

Answer 3

• Ring groove
• Skirt
• Pin bore area

201E pg. 12

Question 4

Where is the outside diameter of a piston skirt measured?

Answer 4

90 degrees to the piston pin bore, midway down the skirt.

201E pg. 16

Question 5

Worn ring grooves allow the rings to rock back and forth resulting in a poor seal.

What three things does this poor seal result in?

Answer 5

• Blow by
• Oil consumption
• Broken rings

201E pg. 17

Question 6

Keystone piston ring grooves must be measured using a:

Answer 6

Ring groove wear gauge.

Tool is inserted into the groove. If the shoulders of the gauge touch the ring lands, the groove is worn out and piston must be replaced.

201E pg. 18

Question 7

What causes piston slap?

Answer 7

A knocking sound caused by excessive clearance between cylinder bore and piston skirt.

201E pg. 19

Question 8

Connecting rods should be inspected for bends and twists. What will a bent connecting rod cause in an engine? (2)

Answer 8

• Reduced compression ratio
• Uneven wear on piston and connecting rod bearing & journal

201E pg. 27

Question 9

What tool should be used to check connecting rods for bends or twists?

Answer 9

Alignment fixture

201E pg. 28