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Leak under engine


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so I have a leak that’s leaking over night about 1 table spoon pics attached not wet anywhere else and definitely not sump bolt I recon rear main?

 

Edited by Olie1290
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It looks like your profile says you have a 2002 response LX? If so I don’t think those boats came with drip less prop shaft packing. I could be wrong but if they didn’t a teaspoon over night is perfectly fine. There should be a slow drip coming in at rest as the water is used for lubricant.

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I think he is talking about an oil leak.

Always hard to find them when you can't see them - and your picture isn't attached.  But the usual culprits would be the rear main seal, oil drain line connection (if you have one) or an oil pan gasket leak.

Unfortunately not much you can do about any of them with the engine in the boat except the drain line.

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Also check the oil filter just to make sure it isn't leaking on the side away from you.

As for the shaft seal, it shouldn't leak when the shaft isn't spinning.  It should let about six to ten drops per minute in with the shaft spinning at idle speed.

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Can you trace the source of the drip either with a finger or by sliding a dry white paper towel along the oil pan?  I know there's not much room under there.

I had an oil leak on my '01 that turned out to be a failing oil pressure switch.

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There are several potential sources:  rear main seal, oil filter, oil pressure sensors, valve cover gaskets, distributor gasket or even the intake manifold end gaskets.  Based on your comment that you are looking and checking for film / evidence elsewhere the rear main is a likely choice.  Although based on the comment that could assume no oil in the bilge when you stop and the oil accumulates overnight, the likely culprits should be the drain tube, drain tube fitting or the oil pan has some porosity.

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I was surprised on mine how much dried out valve cover grommets (crank case ventilation) can create oil in the bilge.  Quick fix on those.  I also second drain tube, drain tube fitting.  Mine weep a bit, hard to get at.

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