Oily Sheen in Raw Water Exhaust

SCSeaside

Member
Joined
Apr 17, 2006
RO Number
20895
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1
I have Crusader 454 350 engines in my 1969 Uniflite 36 Costal Crusier. The port engine raw water exhaust has recently started to show an oily sheen when she is sitting at idle at the dock. Mechanic thought it might be fuel related so she has a new fuel pump, new carburetor, and no evidence of lubricant loss for either the engine or transmission.
I'm stumped. Anyone out there that has experience this problem? Any suggestions as to where to look?
Thanks in advance.
 
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