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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 08-16-2013
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"Help" 2GM20F Exhaust flang will not tighten

I have tried i bet 10 time's to get the exhaust flang to tighten up? It will not tihten on both the top and bottom at the same time?
It is the male couplin coming out of the mixing elbow into the exhaust elbow. Does it get a nother coupling of some type?
God help... I'm at my witzzzz end. I dont want to take the exhaust elbow off the block. I dont have a steel gasket and cant look up parts for this engine? No parts manuls out there on line.

Again its the double threaded silver nut in the middle of the photo How do I get them to tighten at both ends at the same time?

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Old 08-16-2013
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Re: "Help" 2GM20F Exhaust flang will not tighten

From your picture, you've already got all the parts off the block, no? I replaced the coupling and mixing elbow on a 2GM20F a few years ago. And if I recall correctly, you need to tighten the coupling onto one part and then spin that combination to tighten onto the other. You use a wrench on the middle of it to keep it from loosening off one end while tightening it to the other.

The short answer would have been, I don't think you can just tighten both at once--the threads are not reversed on the two ends of the coupling and each end needs a clockwise turn. Again, this is my recollection, recalled through the fog of war that surrounds all my boat repairs
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Old 08-16-2013
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Re: "Help" 2GM20F Exhaust flang will not tighten

One of the thread is Reverse. I think its the bottom one. By right you could turn the coupling in one direction and it will tighten both top and bottom. But its easier to do it on a bench vice so that you could make it tight and not leak.
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Old 08-16-2013
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Re: "Help" 2GM20F Exhaust flang will not tighten

Hey,

You can't.

First tighten the coupler into the elbow. I would use thread sealant. Then tighten the mixing elbow into the coupler, again with sealant. If, for some reason, you can't do that, you will need a union.

Good luck.

Barry
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Re: "Help" 2GM20F Exhaust flang will not tighten

Ditto on the sealant. Easier to get apart next time too.
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Re: "Help" 2GM20F Exhaust flang will not tighten

Sorry, the photo is not mine. I just used it as an example. I do not have my exhaust elbow off the block. I do have the mixing elbow and the reverse coupling seperated. I will use pipe dope when connection mine.
Barry, I like your Idea I just dont know it I have the room in extra height?
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Re: "Help" 2GM20F Exhaust flang will not tighten

Can you reuse the gasket?
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Re: "Help" 2GM20F Exhaust flang will not tighten

I think I foun the part number...
128370-13201 yanmar gasket Non-Asb
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Re: "Help" 2GM20F Exhaust flang will not tighten

I was able to do it with the exhaust part still on the engine. I had enough space to turn the mixing elbow with coupling to tighten onto exhaust.
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Old 08-17-2013
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Re: "Help" 2GM20F Exhaust flang will not tighten

Doing it in-situ will probably not be tight enough to prevent leaks.
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