Volvo Workshop Manuals
XC70 L5-2.5L Turbo VIN 59 B5254T2 (2003)
Powertrain Management > Tune-up and Engine Performance Checks > Compression Check > System Information > System Diagnosis > Compression Test > Page 3858
Compression Check: Testing and Inspection
Cylinder leakage test
General method description
The cylinders can be checked for leakage as an alternative to a compression test
Using this method, the amount of leakage at the engine cylinders is measured and it is possible to locate the source of any leaks.
How is the cylinder checked for leakage?
The engine should be run to operating temperature so that the thermostat is open
The piston in the cylinder that is being checked must be set to top dead centre (TDC) at the compression phase
A metered air pressure is connected to the relevant cylinder via an adapter that is secured in the spark plug / glow plug well
A gauge is used to measure the size of the leakage from the cylinder.
This is a pressure sensor with a regulator and displays the size of the leak expressed as a percentage.
The source of a leak can be located by analyzing sound at the following points.
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