1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 60Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 60

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TROUBLESHOOTING
Noise Location Possible Causes Crankshaft timing sprocket damaged Camshaft area, front of engine, timed to 12 engine speed Timing chain damaged Valve lifter damaged Cam bearings