ASE Engine Repair 3

Question 1

A cylinder leak-down test showing air escaping from the tailpipe points to a leaking:

Accepted Answer

Exhaust valve

Answer

Air heard at the tailpipe indicates the exhaust valve is not sealing.

Question 2

Air bubbling in the radiator with the engine running often indicates:

Accepted Answer

Combustion gases leaking past the head gasket

Answer

Combustion gases entering the cooling system bubble into the radiator, signaling head gasket failure.

Question 3

Valve stem seals primarily control:

Accepted Answer

Oil entering the combustion chamber along the stem

Answer

Stem seals limit oil from running down the valve stem into the chamber.

Question 4

A dial indicator is used to measure crankshaft:

Accepted Answer

End play

Answer

A dial indicator measures crankshaft end play by reading axial movement.

Question 5

An overheating engine with a collapsed lower radiator hose at high RPM indicates a faulty:

Accepted Answer

Hose or missing internal spring

Answer

A collapsing lower hose lacks its anti-collapse spring or has softened, restricting flow.

ASE Practice Test