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Volvo XC90 Engine >> CRANKSHAFT/CAMSHAFT SEAL OIL LEAKS
Volvo Crankshaft/Camshaft Seal Oil Leaks
Possible oil leaks around the crankshaft, camshaft or other engine gaskets may be due to a clogged flame trap in the PCV system. This does not seem to happen on turbocharged models.
The plastic Y-shaped flame trap is located in the PCV apparatus and may become clogged if engine oil is infrequently changed. Low grade or inexpensive oil may also cause stoppage which allows internal crankcase pressure to build, thus forcing an oil leak. In some cases, the pressure will force the oil dipstick to pop out.
A clogged flame trap should either be cleaned or replaced, says Volvo, and normal maintenance calls for routine cleaning of the trap every 15,000 miles.
The AERA Technical Committee
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