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Old 01-07-2012, 09:21   #1
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Yanmar 3 cylinder - cooling leak

Hi,
I have a Yanmar diesel that leaks water out of a 90 degree fitting at the back and top of the of the engine, same level as the the fill cap, ( directly behind it). I can spin the fitting by hand. I'll post a picture later today. Anyone ever see this?

Thanks,
Neil
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Old 01-07-2012, 09:25   #2
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Click image for larger version

Name:	image-2259118381.jpg
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Size:	198.1 KB
ID:	42938

This is not my engine, but the fitting is just ahead of the exhaust elbow, copper colored. Thanks.
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Old 01-07-2012, 10:16   #3
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Engine Series?

What is your exact engine model #?
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Old 01-07-2012, 15:43   #4
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it's a 3GM30F.
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Old 01-07-2012, 16:30   #5
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Re: Yanmar 3 cylinder - cooling leak

The picture is not very clear, but the fitting seems to have a bolted flange connection. If that is the case, then no. The fitting cannot be spun off. It needs to be unbolted and the gasket would need to be replaced during reinstallation.
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Old 01-07-2012, 16:51   #6
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Re: Yanmar 3 cylinder - cooling leak

It's hard to tell with the wire in the way But it sorta looks like it might be a pipe thread bottom theres sure a wrench flat behind the brass hose fitting, if so maybe it's striped? just a thought, if the wire was moved we could really see the fitting ! this engine is unfamiler to me sorry thats all I can come up with
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Old 01-07-2012, 17:32   #7
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Here's another shot of a Yanmar
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Old 01-07-2012, 17:58   #8
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Re: Yanmar 3 cylinder - cooling leak

If I'm looking at the right fitting it is the saltwater plumbing leaving the heat exchanger and going into the exhaust elbow. However, I may be missing the fitting you are referring to.
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Old 01-07-2012, 18:11   #9
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Correct... on my boat that fitting has a hose going up to a siphon break, (U shaped), the return comes back into the exhaust mixing elbow.
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Old 01-07-2012, 18:20   #10
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BINGO

Was using search engine to see if someone had loaded a Service Manual / page, no luck yet
Here's drawing of your engine that confirms finding
Yanmar 3GM30F drawings - Marine Power Ltd. - Yanmar - Mercruiser - Hydrive

picture
Yanmar 3GM30F - Marine Power Ltd. - Yanmar - Mercruiser - Hydrive

Looks like hose over with clamps
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Old 01-07-2012, 18:25   #11
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Re: Yanmar 3 cylinder - cooling leak

What ever ! if it's spining around and leaking, it's Broke ! LOL has to come off and be repaired! no getting around that ! see if it has bolts holding it down if not its treaded ! change it and your good to go ! sorry but thats the only answer I can see ! Not being a wise ass but it needs to be fixed LOL
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Old 01-07-2012, 18:32   #12
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I don't think it's threaded... it may have a flange nut under, and inside the exchanger...??
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Old 01-07-2012, 18:46   #13
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Re: Yanmar 3 cylinder - cooling leak

I think my diagram shows an o-ring on the elbow fitting, the bolt is what holds the fitting from coming out.

John
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Old 01-07-2012, 18:49   #14
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Re: Yanmar 3 cylinder - cooling leak

Better Photo

Yanmar 27HP 3 CYL WITH SHAFT DRIVE For Sale | Boats for Sale on Boat Deck

Appears that manuals - service & parts are avail - free or pay- search away
example
http://boatdiesel.com/Engines/Yanmar...ads-Page11.cfm
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Old 01-07-2012, 21:20   #15
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There's a small set screw behind the fitting, I removed it and gently pulled up on the fitting, it didn't seem to want to come out, maybe I should pull a bit harder.
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