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Old 06-13-2019, 05:16 AM   #1
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Cummins exhaust manifold gasket leak

1996 6CTA 8.3 mechanical engine.

I have slight exhaust manifold leak on #6 cylinder only at the head mounting surface.

Since it's the end cylinder and easiest to get at I was hoping I might be able to remove the bolts and slightly pry the exhaust manifold away and slide a new gasket in there and install new bolts.

Has anyone tried this an been successful?
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Old 06-13-2019, 08:54 AM   #2
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Update: Cummins exhaust manifold gasket leak

After further investigation the leak is actually a crack in the exhaust manifold mounting flange of the cylinder head.

It's been that way for some time, at least 20K miles I would say, so not sure if it's worth it to replace the head or just drive it until it totally fails or maybe it never gets any worse.
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Old 06-13-2019, 11:46 AM   #3
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6CTA 8.3 was a marine series engine. Didn't know Fleetwood used them in RVs
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Old 06-13-2019, 03:14 PM   #4
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.....hmmm...I've seen a lot of exhaust manifold on Cummins 8.3, and seen a lot of blown gaskets, and many cracked manifold, but I've never seen a crack in head your describing

Can you get a picture of it?

I ain't so sure I wouldn't go ahead and pull exhaust manifold. Replace all gaskets, and check if manifold is warped/cracked....riding on with it leaking is going to lead to other issues.

I'm wondering if the manifold is what your seeing with crack.
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Old 06-13-2019, 04:20 PM   #5
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Some will poo-poo this advice, but google 'Belzona'. It's a high end metal repair compound, sort of like epoxy with a very good temperature rating. If you can find a rep local to you see what they have to say. It won't cost anything to talk to them. I've seen it used in severe industrial services with success.

Good Luck with this.
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Old 06-13-2019, 07:08 PM   #6
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Some will poo-poo this advice, but google 'Belzona'.
Wow. Never heard of this stuff. I've done some seemingly impossible repairs with JB Weld, so I'm not going to poo-poo this suggestion.
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Old 06-13-2019, 07:28 PM   #7
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I ok with the poo poo fix, lol, but only once gaskets are replaced....
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Old 06-14-2019, 04:21 AM   #8
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Quote:
Originally Posted by skypilot_1 View Post
6CTA 8.3 was a marine series engine. Didn't know Fleetwood used them in RVs
I may have it labeled incorrectly. It's the 12 valve mechanical 8.3 liter engine.
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Old 06-14-2019, 04:29 AM   #9
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.....hmmm...I've seen a lot of exhaust manifold on Cummins 8.3, and seen a lot of blown gaskets, and many cracked manifold, but I've never seen a crack in head your describing

Can you get a picture of it?

I'm wondering if the manifold is what your seeing with crack.
It's definitely the head that's cracked. I'll try to get a pic of it but its on the bottom side of the exhaust port and I can only feel it and see it in a small inspection mirror.

I've been noticing the soot on the flat land area under the exhaust port for some time now and just assumed it was the gasket but once I looked at it with the mirror I could see a defined soot line on the casting and thought that was odd. So cleaned it up and sur enough I could then see and feel the crack.
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Old 06-14-2019, 05:07 AM   #10
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Here's a link to an article I found online of the same thing (with photos) but much worse. Mine is only cracked on the bottom side of the port in the same place but nothing like this, just a hairline crack at this point. In this guys case it also was the #6 cylinder.

https://talk.newagtalk.com/forums/th...ed&setCookie=1
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