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Home >> Volvo >> 2003 >> C70 2.3 53, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Engine - Removal, Replacement And Installation (Coupe)) >> Compression Test, Checking For Cylinder Leaks And Spark Plugs (1998-1999) >> Cylinder leakage test >> General method description >> Check piston

Check piston

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

If a leak is detected that is assumed to come from the valve system, first check that the piston in the relevant cylinder is at top dead center (TDC).

Then try to set the piston just prior to top dead center (TDC) and redo the test.

When repeating the leak test on the same engine, there are usually variations in the results of the measurements.

This is due to changes in the engine coolant temperature (ECT) and the piston not reaching the same position as in the previous test, and is affected by the amount of oil on the piston rings at the time.

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