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Allis Chalmers Discussion Forum

WD-45 head, manifold surface

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07-30-2011 11:31:09

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I recently had a valve job done on a head for a WD-45 I'm restoring. When I put the manifold on I noticed a large gap between the head and manifold on the outside exhaust ports. When I checked both with a straight edge the head was off more than the manifold. The manifold is being planed flat. Is there anything similar to epoxy I can build the head surface up with that will withstand the heat? I should have checked this before I bolted the head on. I've been told MIG welding is the best thing to do and have it machined flat again. Or just try using more gasket on the ends. I'm probably not the first guy to have this problem so I thought I'd see what some of you think. Thanks.

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08-01-2011 17:03:42

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 Re: WD-45 head, manifold surface in reply to S.C., 07-30-2011 11:31:09  
I set the head up on the horizontal mill & took a clean up. I recut the manifold, I'm fairly sure the intake ports are supposed to be about .020 higher than the exhaust. If the exhaust leaks, no big deal. If the intake leaks........

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Wierd Harold

07-30-2011 18:42:10

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 Re: WD-45 head, manifold surface in reply to S.C., 07-30-2011 11:31:09  
I've encountered the same problem restoring a couple of D17's. I was sucessful in finding a machine shop to mill the manifold mating surface. Milling appeared to me to be the only option because of the recessed area where the manifold mates. They really turned out well.

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07-30-2011 13:42:05

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 Re: WD-45 head, manifold surface in reply to S.C., 07-30-2011 11:31:09  
I used JB or some kind of epoxy. It held for awhile. Not long enough to make it worth while.

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Mike Bock

07-30-2011 13:07:01

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 Re: WD-45 head, manifold surface in reply to S.C., 07-30-2011 11:31:09  
i have brazed the head up before and filed it flat again worked good but head was off tractor if you are real good could probably do it on tractor with out pulling head , probably would be best to go and pull the head and do what you should of done in the first place jb weld might work but i doubt it would handle the heat

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08-01-2011 12:12:36

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 Re: WD-45 head, manifold surface in reply to Mike Bock, 07-30-2011 13:07:01  
Attn. Mike Bock, my grandparents last name was Bock, Jacob Bock. And i'm interseted in where you are from because it would be nice to know your location.

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little willy

08-04-2011 19:21:55

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 Re: WD-45 head, manifold surface in reply to D.D.S, 08-01-2011 12:12:36  
i live in s IL by mt vernon my great grandfather lawrence Bock lived in Colorado for a while

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Bob Bancroft

07-30-2011 11:44:41

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 Re: WD-45 head, manifold surface in reply to S.C., 07-30-2011 11:31:09  
I have used more than one gasket on the ends, plus a little high-temp. silicone to try to hold things together.

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MN Mike

08-01-2011 05:11:44

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 Re: WD-45 head, manifold surface in reply to Bob Bancroft, 07-30-2011 11:44:41  
Ditto to Bob's post. I doubled up to make up the gap on mine. That seemed to be enough to fill the void, seal things back up and not break the bank doing it.

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