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Old 06-23-2013, 08:55 PM
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SWGA Boater SWGA Boater is offline
TT Enthusiast
Join Date: Oct 2012
Boat: Not a MasterCraft
Location: Southwest Georgia
Posts: 203
Still have excessive crankcase pressure/oil leak

Ran the boat with the engine cover off this afternoon. Have isolated the oil leak to blow by out of the dipstick tube. Almost immediately after getting into the throttle dipstck pops up and starts spitting oil out. Had previously installed a new pcv valve and a breather oil fill cap. So much pressure was coming out of the breather cap it literally looked like smoke. Put my nonvented oil fill cap back on which leads to more blow by/oil coming from the dipstick tube. Should have taken a video...

I'll try and pick up or rent a compression gage tomorrow. Piston ring blow by is the only thing I can think of causing this much pressure. Seems to idle fine and no skipping under a load though.

Any other thoughts?
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