1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 38Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 38

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MAINTENANCE
1 Raise drive unit to full UP position2 Install flushing attachment over water pickup holes in gear housing as shown3 Attach water hose between the flushing attachment and water tapa