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Old 04-17-2016, 09:33 PM   #1
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A gap between flange and housing of the turbo

on my isc 350. the exit flange and the turbo housing has a small gap about 1/16" wide and 2" inches long. whenever engine is running, a portion of the exhaust air escapes from there. not only reduces it the efficiency of pacbrake adjacent, but also the wasted air fills up the area and gets inside the coach. i was thinking to fill the gap with jb weld, but considering the super hot and cold on the spot, jb weld may not stand long. does anyone have a recommendation what kind of fillers are to be used? tia.
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Old 04-17-2016, 09:39 PM   #2
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Quote:
Originally Posted by CountryFit View Post
on my isc 350. the exit flange and the turbo housing has a small gap about 1/16" wide and 2" inches long. whenever engine is running, the exhaust air will be streaming out. not only reduces it the efficiency of pacbrake adjacent, but also the wasted air fills up the area and gets inside the coach. i was thinking to fill the gap with jb weld, but considering the super hot and cold on the spot, jb weld may not stick well. does anyone have a recommendation of the kind of fillers? tia.
Any kind of filler will only be temporary. You need to get a new flange. The pipe will have to be cut and the new flange welded to the old pipe.
Not only is the leaking exhaust gas a health hazard, it is a fire hazard as well.
There are only two ways to repair this. The right way or again. In this case, again and again and again and again.
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Old 04-17-2016, 09:41 PM   #3
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Sounds like you need a new exhaust pipe. The exhaust pipe that connects to the turbo often has a flange or flare on it that can be eaten away after many miles.

Years ago I had an International work truck with a DT466 and an exhaust brake. The exhaust pipe between the turbo and the exhaust brake would burn out about every 30,000 to 50,000 miles.
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Old 04-17-2016, 09:56 PM   #4
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thanks gents. i observed that the flange is bolted onto the turbo housing by 4 bolts, and the flange appears to be flat but the housing in the contact has been eaten out with a slight curve (forming a gap of about 1/16"). the other side of this flange is mated with the packbrake which is fine. i wonder if i should weld the gap directly...
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Old 04-18-2016, 07:02 AM   #5
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If it is the flange I think it is on one turbo I had off it had a gasket and the new turbo did not have a gasket in the same location. But if it already has a gap I don't think a gasket would work now.
I would never try welding on the turbo housing.
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Old 04-18-2016, 09:58 PM   #6
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Lots of new hi tech hi temp sealants out there. Maybe worth trying. Don't see a downside to trying as its downstream from the turbo (correct?)
See this link for example. Maybe I'm all wet but for such a small leak it might work.

Deacon Industries, Inc. | High Temperature Sealant Specialists
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Old 04-18-2016, 10:54 PM   #7
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If it is the flange I think it is on one turbo I had off it had a gasket and the new turbo did not have a gasket in the same location. But if it already has a gap I don't think a gasket would work now.
I would never try welding on the turbo housing.
you are right, mine doesn't have a gasket in it, and not the flange issue.

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Lots of new hi tech hi temp sealants out there. Maybe worth trying. Don't see a downside to trying as its downstream from the turbo (correct?)
See this link for example. Maybe I'm all wet but for such a small leak it might work.

Deacon Industries, Inc. | High Temperature Sealant Specialists
thanks for the link! yes, it's at the downstream. there will be no damage if it doesn't work.
i'll call the seller to find out if something i can use.
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