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Old 09-22-2017, 03:09 PM   #11
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Have you been able to determine if it leak just sitting?
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Old 09-23-2017, 02:31 PM   #12
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Will be some time. Boat is laid up for the better part of the next week. Schedule takes me elsewhere. We'll see, but to the eye it doesn't appear to be leaking when not running. The paper towels will tell.
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Old 09-23-2017, 03:36 PM   #13
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Will be some time. Boat is laid up for the better part of the next week. Schedule takes me elsewhere. We'll see, but to the eye it doesn't appear to be leaking when not running. The paper towels will tell.
Understood, if it doesn't leak sitting that rules out a leaking drain plug or rusted out oil pan. What remains is oil pan gasket, dipstick, front or rear crank seal, corner of a head gasket, intake gasket, oil sendor, valve cover gasket.

If I recall the leak is loosing a fair amount of oil in a short time so oil pan gasket, crank seal are most likely.
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Old 10-10-2017, 04:21 PM   #14
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OK, had a chance to get back into the boat, and the oil leak, over the long weekend. Now I can see that the majority of the leak comes while running. It comes from low on the engine (4.3 ltr.), there is no oil evident on top.

I think it's pretty substantial in that it's about 3/4 cup or so, after only about 2.5 hrs. running time on it; very light loads; 2600 rpm, cruising speed. Thru the end of the season, I'll see about rigging up some sort of drip pan using one of those, throw away oven roasting pans, just to keep it contained, and look to keep the oil topped off.

But long term, i have to think the boat, though very lightly used (180hrs, total, now) was not well maintained, and I imagine it was used for towing, with nobody looking at the oil. Cannot be good for the motor.

The realist in me says, this is something like a front crankshaft seal. I would be lucky if this was only an oil pan gasket.

Any thoughts are greatly appreciated.
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Old 10-10-2017, 05:02 PM   #15
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Toss a few oil absorbing sheets down in the bilge and replace them after each outing. It'll be easier than a roasting pan in the long run.
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Old 10-10-2017, 10:07 PM   #16
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Front crank seal is easier than the pan gasket. Could also be rear main seal which requires pulling the engine. Do you have a remote oil filter kit? Mine had leaking hoses.
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Old 10-11-2017, 09:28 PM   #17
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no on the remote oil filter. I guess simplest thing to do is go with the oil absorbing pads for now.
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Old 10-11-2017, 09:49 PM   #18
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no on the remote oil filter. I guess simplest thing to do is go with the oil absorbing pads for now.
Yep basically what I said in post #6
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Old 10-11-2017, 11:29 PM   #19
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Easiest way to trace an oil leak that's not easily visible to the eye, put dye in the oil.
Get yourself some of these, and the UV flashlight.
https://www.amazon.com/Tracer-Produc.../dp/B000JFHNTM

See article here => Finding Oil Leaks
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