Engine Mechanical Testing

Cylinder leakage is measured when the piston is at __________.

• TDC

• BDC

• In the middle of the cylinder

• 3/4 to the top of the cylinder

When performing a cranking compression test, the readings between cylinders should be _____________.

• 0% - 5%

• 5%-10%

• 10% - 15%

• 20% - 25%

A coolant leak would emit _____________ smoke from the exhaust.

• blue

• white

• black

• green

An engine has a fast cranking sound, what could possibly be the issue?

• bad starter motor

• high compression

• bad spark plug

• broken timing belt or timing chain

During a vacuum test on an engine, a technician gets a low, but steady reading. What could be a potential issue?

• failed catalytic converter

• late ignition timing

• failed piston rings

• burned valve

The amount of vacuum in an engine depends on:

• Piston rings

• valves

• ignition timing

• all of the above

In a 4 cylinder engine, cylinders #2 and #3 are reading very low. What could be the issue?

• bend valve

• worn piston rings

• bad camshaft

• Failed Head gasket

During a cylinder leakage test, air can be heard escaping from the tailpipe. What could cause this?

• This is normal for most engines

• Intake valve is bent

• Exhaust valve seat failure

• intake valve seat failure

What kind of issue could be found in a WET compression test?

• Worn piston ring

• hole in the piston

• worn valve

• worn camshaft

The Unit of measure for a compression tester or cylinder leakage tester is:

• psi

• kPa

• both psi and kPa

• none of the above