1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 136Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 136

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377 CID6.2L ENGINES
Cleaning and Inspection
1 Clean crankshaft seal running surface2 Clean the seal retainer bore
Installation
1 Apply thin coat of clean engine oil to the bore