1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 67Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 67

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TROUBLESHOOTING
Water in Crankcase Oil
Cause Water seeping past piston rings or valves Engine running cold Intake manifold leaking near water passage Cracked or porous casting Special Info