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post #1 of 13 Old 02-23-2018 Thread Starter
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Oil in bilge

Hi guys,

Iíve been seeing some oil in my bilge and was wondering how best to track down the issue. The engine is a Yanmar diesel.

Any ideas where to check first/look into?

Thanks!


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post #2 of 13 Old 02-23-2018
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Re: Oil in bilge

What model Yanmar? Clean the engine and the bulge and put a white absorbent oil pad under the engine. This makes seeing a drip easier. Several of the models have an oil line that runs under the flywheel bell housing. the line is steel and can corrode through.

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post #3 of 13 Old 02-24-2018
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Re: Oil in bilge

https://www.defender.com/product.jsp...3277&id=106252

Those placed under your engine will tell you a story of where any oil may be coming from.
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Re: Oil in bilge

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Originally Posted by CalebD View Post
https://www.defender.com/product.jsp...3277&id=106252

Those placed under your engine will tell you a story of where any oil may be coming from.
I swear I want to go in business selling these. All marine dealers ask in the neighborhood of $2 per individual absorbent pad. You can buy them in bulk on Amazon for around 25 cents per pad. I bought a box of 100 a few years ago and always have a handful aboard.

They are like magic, as they'll absorb oil and diesel, but not water, so you can remove the oil from water that needs to be pumped overboard. I believe each pad will hold something like a quart of oil.
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Re: Oil in bilge

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Originally Posted by agg212 View Post
Hi guys,

Iíve been seeing some oil in my bilge and was wondering how best to track down the issue. The engine is a Yanmar diesel.

Any ideas where to check first/look into?
As mentioned, you'll likely need to clean the bilge and engine block to find this, then run it a bit with pads laid out. However, use a good flashlight and look around for a trail. Wiping a clean white paper towel can sometimes identify oil you can't see easily. I would wipe one around the bottom of the filter seal, around the breather hose, base of the valve cover, engine side of the water pump, or any oil returns/lines.

Hopefully, you simply need to tighten something up or replace the filter (I would not try to snug a filter, the gasket might be fouled). Worst case stuff is to find a leak near the seam between the case and head (head gasket) or, god forbid, a case crack. Neither are most likely, without lots of other symptoms.


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post #6 of 13 Old 02-24-2018
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Re: Oil in bilge

cannot say enough good about those engine diapers for absorbing oil not water. they are excellent.
one in the bilge and one under engine. i place a folded one under remote oil filter and hoses also.
is easy to find the inevitable (in my case, perkins) oil drip site with these.
be glad they only 2 bux in your 'hood. they are 250 pesos in mine..that is more than 2 bux, at 18.5 pesos per dollar.


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post #7 of 13 Old 02-24-2018
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Re: Oil in bilge

leaks can move laterally as they move vertically driven by gravity. The drip location UNDER the engine is only an approximate PLAN location of the offending leak.

pay attention... someone's life depends on it
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Re: Oil in bilge

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Originally Posted by SanderO View Post
leaks can move laterally as they move vertically driven by gravity. The drip location UNDER the engine is only an approximate PLAN location of the offending leak.
Absolutely true. There's a saying that only on boats will water run uphill.

Of course, it doesn't run uphill, but when you're out pitching and rolling, uphill can be in a different plane than at the slip.

Still, if you find where the drip came down, you should be able to find a trail back to the source.


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post #9 of 13 Old 02-24-2018
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Re: Oil in bilge

one way to trace a liquid leak is to dust the engine with some talc... lightly and the path will be readily seen back to its origin.

I had a diesel leak but it was hard to see and ultimately figure out the location precisely -- several fittings , hose and so on. I decided to simply remove/ replace / re rout the hose and re tighten all the fittings and leak was gone. Fuel leak I could trace through hoses and so forth.

pay attention... someone's life depends on it
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post #10 of 13 Old 02-24-2018
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Re: Oil in bilge

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Originally Posted by zeehag View Post
cannot say enough good about those engine diapers for absorbing oil not water. they are excellent.
one in the bilge and one under engine. i place a folded one under remote oil filter and hoses also.
is easy to find the inevitable (in my case, perkins) oil drip site with these.
be glad they only 2 bux in your 'hood. they are 250 pesos in mine..that is more than 2 bux, at 18.5 pesos per dollar.
Zee - that's like $13 per pad.

How much are disposable baby diapers where you are - they work just as well.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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