1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 64Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 64

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TROUBLESHOOTING
Oil leak can be internal or external Excessive bearing clearance

High Oil Pressure
Cause Oil too thick Defective oil pressure gauge andor sender Clogged or res