1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 417Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 417

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SEAWATER COOLING SYSTEM
Removal
1 Drain water from cylinder block and exhaust manifolds2 Remove thermostat housing and related components3 Remove thermostat

- Retaining BoltsW