1983 Volvo md17d oil leak - SailNet Community
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post #1 of 18 Old 01-09-2020 Thread Starter
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1983 Volvo md17d oil leak

My diesel used to just burn oil. Now it leaks it too! Anyone have any ideas what this "cap" looking bit is? Its weeping oil from there when running.
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post #2 of 18 Old 01-09-2020
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Re: 1983 Volvo md17d oil leak

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Originally Posted by Scottrgrewe View Post
My diesel used to just burn oil. Now it leaks it too! Anyone have any ideas what this "cap" looking bit is? Its weeping oil from there when running.
Do you have the service manual? I have it on board. I'll check on the weekend

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Re: 1983 Volvo md17d oil leak

Maybe blowby crankcase pressure is increasing or whatever acts as PVC is plugged. Gasket on that plug is not up to the task.
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Re: 1983 Volvo md17d oil leak

Scott...

I have an MD17c.
Don't worry much about that one.
Prise it out from the edges, clean it up, clean up the recess, slap some sealant on there, and press it in again.
Any decent sealant will do it.

Remember to drain the motor in the winter. Don't let it freeze. Been there, done that.

As regards burning oil, if the engine is starting OK, live with it. Just watch it carefully and pour some more oil in there when it needs it.
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Re: 1983 Volvo md17d oil leak

Is that plug/cover on the housing the transmission is bolted to - the bell housing? If so, then you may have a leaking rear crankshaft seal. The bell housing is hollow, so any oil that leaks from the rear seal gets slung around in there and comes out in places like that. I suspect it is only a plastic plug that just covers a hole in the bell housing used for other purposes that you don't have.

Pull the plug and look inside to see how much oil is in there.

Mark
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I found a replacment rubber plug. When I took the old one off I looked inside with an endoscope. There was oil- but it was low down in the engine, I'm assuming I was looking into the sump. New plug doesnt leak!
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Re: 1983 Volvo md17d oil leak

If that is the bell housing, I don't think you are looking down into the oil sump. If there is oil pooled there, it is almost certainly a leaking rear seal.

If it is not the bell housing, then I don't know what it leads to. Again, I can't really tell from the picture where on the engine that plug is located.

If it is the rear seal, stopping the leak out of the plug is like painting rotten wood to look new. It doesn't hurt anything to have a leaking rear seal until it gets so bad that you are pouring oil in constantly.

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Re: 1983 Volvo md17d oil leak

Port for optional oil extraction/change pump...?
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Re: 1983 Volvo md17d oil leak

I found this in the shop manual
I am thinking the plug Scott refers to is on the stbd side below the #13 and to the right of #21
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Yep that's it. That round rubber plug.
Not the bell housing- right?
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