Cracked exhaust manifold 190 gas
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=137235
Printed Date: 07 Oct 2025 at 4:31am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Cracked exhaust manifold 190 gas
Posted By: Jamz
Subject: Cracked exhaust manifold 190 gas
Date Posted: 10 Apr 2017 at 3:28pm
I can not find a replacement exhaust manifold for my 190 gas, it appears they aren't available NOS, aftermarket, or used and from the sound of it, I wouldn't want one anyway because they always crack. One crack had been welded and didn't hold.. I think I can clamp a soft aluminum gasket around both cracks and install new manifold gaskets(readily available) and be OK.
Or, perhaps others in this situation have found better a solution ?
I would like to replace the intake manifold gaskets also because I think they're leaking and causing it to run rough after an hour or so of proper operating temperature....but I cannot find them anywhere.
Can anyone help me find them ? It's an early 190, sn# 1364 if that matters.
Thanks
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Replies:
Posted By: farmboy520
Date Posted: 10 Apr 2017 at 3:52pm
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Do you have one? Are you wondering if you can fix one? What are we dealing with? We want to help you.
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Posted By: Jamz
Date Posted: 10 Apr 2017 at 4:16pm
Sorry Farmboy, I fat fingered and sent the post before writing it,
it should be updated now.
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Posted By: 45 turboa-
Date Posted: 10 Apr 2017 at 4:22pm
I have one off a 180 gas I think it is the same i'll CK part # to be sure.
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turbocharged
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Posted By: Jamz
Date Posted: 10 Apr 2017 at 4:51pm
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Part# on my cracked one is 4023626
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Posted By: LeonR2013
Date Posted: 10 Apr 2017 at 5:18pm
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They can be welded, but it takes a man that knows what he's doing. If your intake is not cracked they can be surfaced.
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Posted By: ac fleet
Date Posted: 10 Apr 2017 at 8:17pm
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What about one off a combine engine??? different OR same??? thanks; ac fleet
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Posted By: Matt (Jordan,MN)
Date Posted: 10 Apr 2017 at 8:43pm
Have a nos one for sale. Send me a PM if interested
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Owner of Matt Scott LLC
Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair
http://www.mattscottllc.com/
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Posted By: DrAllis
Date Posted: 11 Apr 2017 at 7:24am
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A new A-C replacement manifold is probably different than the original. A-C took out some of the sharp bends in the runners to help keep the cracks from forming.
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Posted By: Calvin Schmidt
Date Posted: 11 Apr 2017 at 10:28am
When I was looking for one last year, I found that there are 3 part numbers each superseding the previous one. I bought a nice properly welded used one and had it resurfaced before instalation which is a must in my opinion.
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Nothing is impossible if it is properly financed
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Posted By: AndrewGubbels
Date Posted: 11 Apr 2017 at 10:44am
The combine manifolds will work and as was stated earlier in multiple posts the later ac manifold was redesigned without allis chalmers written on the exhaust side. The later g gleaned and we also have a 1970 190xt gas with the later style. They do not have the issues breaking. Also definitely have it surfaced or be checking this. I like to do the exhaust and intake together bolted up so there is as little chance of a bind as possible.
Andy
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Andrew Gubbels
Gubbels Restoration
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Posted By: Jamz
Date Posted: 11 Apr 2017 at 5:59pm
Thanks guys, this is good info ! It may explain why ALL STATES parts catalog does
have an item(101486) that replaces OEM no. 74007652 and 74007653. No mention of my
4023626. However, the picture they have of that item definitely does not look like it would work, it has the outlet square in shape being off center while mine is a round threaded outlet that's centered. Maybe it's just the picture in their book that's wrong.
If anyone knows what part number(s) the newer ones are, I'd appreciate it ! Or if the one from the combine is the later style.... and if so, has the same part number.
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