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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 >> Fault-tracing

General method description: Fault-tracing

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.

The source of a leak can be located by analyzing sound at the following points.

Exhaust pipe Faulty exhaust valve
Intake manifold / throttle body (TB) Faulty intake valve
Dip stick hole / Crankcase ventilation Faulty piston / piston ring
Adjacent cylinder Faulty cylinder head gasket
Radiator Faulty cylinder head gasket / cracked cylinder wall.
Also check for bubbles in the expansion tank.

A mechanic's stethoscope or a rubber hose can be used as a listening device.

NOTE:

There is leakage at the piston rings even on a perfect engine.

This is the only place where a small leak is permissible.

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