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Old 05-20-2019, 01:43 PM   #1
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Dt466 cracked exhauat manifold

I found a pretty big crack is it worth tryinf to grind out and weld for 0$ or should i source a new used one? will the dt466e manifold be the same? I want a bigger turbo what would be the cheapest yard one to get?
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Old 05-20-2019, 02:08 PM   #2
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Old 05-20-2019, 02:30 PM   #3
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Far from being a metallurgical expert here, but I thought cast iron can't be welded...
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Old 05-20-2019, 02:39 PM   #4
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Originally Posted by haz.matt.1960 View Post
Far from being a metallurgical expert here, but I thought cast iron can't be welded...
it can be welded using the proper procedures - pre-heating the cast being one of them
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Old 05-20-2019, 03:20 PM   #5
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Depends on the quality of the iron. Cast iron is a somewhat of a relative term.

Your better cast alloys can be welded with a nickel rod($$).

You have to drill the ends of the crack, v the crack out with a grinder, Pre heat the entire piece to a suitable temperature, perform the weld, peen the welded area, and then let cool at a controlled rate.

Most often, it isn't worth it time or financially, which is why manifolds are often replaced.

In this situation, I'd replace it, because the crack is in a high stress/flex area being near the turbo.
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Old 05-20-2019, 03:39 PM   #6
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I can’t see the crack ��
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Old 05-20-2019, 04:11 PM   #7
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The Phillips' point at it's ends.
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I canít see the crack ��
Thanx, all y'all, I didn't know that.
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Old 05-20-2019, 04:57 PM   #8
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i have also had success drilling the ends of the crack beveling the crack preheating the area to cherry red and running a mig gun across it for small area,s if its not to close to a gasket.
A brass flux coated brazing rod will also work [or have had success with many times ] because you have to pre-heat the area to braze anyway.
using the same drill the ends and bevel the crack.
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Old 05-20-2019, 05:43 PM   #9
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i have also had success drilling the ends of the crack beveling the crack preheating the area to cherry red and running a mig gun across it for small area,s if its not to close to a gasket.
A brass flux coated brazing rod will also work [or have had success with many times ] because you have to pre-heat the area to braze anyway.
using the same drill the ends and bevel the crack.
a friend of mine ( an ingenious old Swiss guy that trained as a machinist as a young man in Switzerland ) uses (used) Borax as a flux when he brazes - he used to have his own carbide generator and lot of old fashioned tools - seemed to be able to fix most anything from tiny to bulldozers and have the repair wind up stronger than new - kind of guy that had a solution to any mechanical problem - loved working in the bush with him - always considered myself to be a bit on the ingenious side, but working with Joe was like being in the presence of a master - Joe was injured in a snow slide and a blow to his head caused him to go blind, so he isn't able to do any of that now - he was awarded a medal a few years back in honour of the support he gave to our community - one of his accomplishments was to design his own T-Bar lift on our community ski hill - he designed and built the retractable T-bars, the cable towers and many of the other things needed for smooth and safe operation - and cleared the ski run with his own cat - all volunteer -the kind of person every community needs
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Old 05-20-2019, 06:51 PM   #10
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DT-466 manifolds are an easy find.. toss it and get another.
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