The crankshaft gasket has been leaking oil it would have been an easy job except for one bolt which I couldn’t get out without removing the pulleys.

A little bit of anaerobic gasket sealant.

What’s behind the cover on a 300HP engine!

A new gasket. However, as with all jobs on this boat more jobs are created everytime I do one I find another three to do! When I removed the pullies I found the alternator adjuster which allows the belts to be tightened is fully seized up. Despite PB blaster, hammering it and lots of heat and cold shock it is still well siezed. Time for cracking the nuts or a hacksaw.