ASE A2 Friction and Reaction Units

Question 1

A technician measures clutch pack clearance with a feeler gauge between the pressure plate and the snap ring and finds it greater than specification. Which correction is appropriate?

Accepted Answer

Install a thicker selective snap ring or pressure plate

Answer

A thicker snap ring or pressure plate takes up space in the stack and reduces clearance. A thinner one would increase it.

Question 2

When air testing an assembled clutch drum by directing compressed air into its apply passage, which result points to a failed piston seal?

Accepted Answer

Air escapes with a hiss and the piston moves weakly or not at all

Answer

If the piston seals leak, air escapes and the piston cannot build enough force to move. A good clutch applies with a dull thud and releases when air is removed.

Question 3

A technician disassembling a clutch pack finds the steel plates blued and the friction plates dark, glazed and flaking. What is the most likely cause?

Accepted Answer

Prolonged slippage that generated excessive heat

Answer

Blued steel plates and burned friction material result from heat produced by a slipping clutch.

Question 4

Why must new clutch friction plates be soaked in the specified ATF before assembly?

Accepted Answer

To saturate the lining so it does not scuff or burn on its first engagements

Answer

Soaking saturates the lining with fluid so it is lubricated and cooled from the first apply. Dry plates can scuff or burn before fluid reaches them.

Question 5

A technician checks an installed one-way roller clutch by turning the inner race by hand. Which behavior is correct for a good unit?

Accepted Answer

It locks in one direction and freewheels in the other

Answer

A one-way clutch must hold in its driving direction and overrun freely in the opposite direction.

ASE A2 Practice Test

ASE A2 Practice Test

ASE A2 Friction and Reaction Units