How Do You Do a Leak Down Test on an Engine

To use a leak-down tester, you remove the spark plugs as above and rotate the engine until the piston is at top dead center for the cylinder you are testing. Insert the leak-down tester hose into the spark plug hole, then connect it to a compressed air source of at least 100 psi.

How do you perform a leak down test on an engine?

To use a leak-down tester, you remove the spark plugs as above and rotate the engine until the piston is at top dead center for the cylinder you are testing. Insert the leak-down tester hose into the spark plug hole, then connect it to a compressed air source of at least 100 psi.

What is the difference between a compression test and a leak down test?

A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure.