Air leak around oil pump

[seadoodle]

So I performed a pressure test on the engine and found air leaking out from around the oil pump. In the shop manual (1992), it shows that there is supposed to be an o-ring to seal the oil pump. But on the later year seadoos, they use a gasket between the oil pump. Should I go to a hardware store and buy the o-ring, or can I get away with just using the gasket found on new models? I feel like the gasket is an improvement over the O-ring, but I know the gasket thickness might impact the alignment of the oil pump to the RV teeth. Any suggestions?

 

[seadoodle]

Actually just realized the gasket in asking about isn't the right shape. So what should I do?

 

[jjsinaz]

If you're pressure testing the engine correctly, and there's air leaking from around the oil pump, I'd be more inclined to think you have a crankshaft seal leak

 

[Chester]

Yup, you need a new front crank seal. Time for a teardown.

Chester

 

[jjsinaz]

Okay, after reading the op, this is an older ski that the oil pump drives off the rotary valve gear, not the front of the crankshaft. Not sure what would be causing that leak Replace the o ring and test it again. Sorry for the bad info first time around

 

[seadoodle]

Yes, you are correct. I figured it out. I just put some grease on the o ring and torqued it down and that stopped the leak. I just now discovered that one of the oil line barbs on the RV cover was leaking air. I didn't realize how frustrating pressure testing is.