Measurement Procedure

WARNING: This page is about a different variant/trim than selected.

Rotate the crankshaft to place the piston in the cylinder being tested at top dead center (TDC) of the compression stroke.

NOTE:

It may be necessary to hold the crankshaft balancer bolt to prevent the engine from rotating.

Install a suitable leakdown tester and EN-46722 Compression Gauge Adapter.
Apply shop air pressure to the tester and adjust according to the manufacturers instructions.

NOTE:

A leakage test may be performed to measure cylinder/combustion chamber leakage. High cylinder leakage may indicate one or more of the following:

Record the cylinder leakage value. Cylinder leakage that exceeds 25 percent is considered excessive and may require component service. In excessive leakage situations, inspect for the following conditions:
- Air leakage sounds at the intake manifold tube, may indicate a worn, stuck or burnt intake valve, broken valve spring, incorrect valve lash or damaged valve train components.
- Air leakage sounds at the exhaust system tailpipe may indicate a worn, burnt, or stuck exhaust valve, broken valve spring, incorrect valve lash or damaged valve train components.
- Air leakage sounds from the crankcase, oil level indicator tube, or oil fill tube may indicate worn piston rings, a damaged piston, a worn or scored cylinder bore, a damaged engine block or a damaged cylinder head.
- Air bubbles in the cooling system may indicate a damaged cylinder head or gasket.
Remove the leakdown tester and EN-46722 Compression Gauge Adapter.
Perform the leakage test on the remaining cylinders and record the values.