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Allis Chalmers Discussion Forum
Show Parts for Model:

WC leaky head gasket

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Matt Reinders

01-03-2018 06:45:57




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I recently rebuilt a 1937 WC engine. I sent the head and block to be machined and leveled prior to the rebuild. I followed the torque pattern/specs, but when I went to add coolant to the engine the head gasket leaked coolant. I am going to remove the head and start again, but asking to see if I missed anything. I did spray the new gasket with copper coat sealant. I used the old studs as well. Just seeking advice. Thank you!

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resden

01-09-2018 15:44:14




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
Where do you get the Hylomar? Went to NAPA and all they had was Permatex spray copper! Is the Hylomar a spray or liquid? Do you apply it to both sides?

I installed a new sleeve and piston on a WC and installed the head with a new gasket, torqued the 1/2 inch studs to 90 and the 3/8 inch to 35 and still had coolant dropping down on the camshaft so I guess I will have to get another new gasket and do as you say!

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wgm

01-04-2018 17:41:46




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
Tighten the head bolts more until the gasket stops leaking.



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old

01-04-2018 19:04:10




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 Re: WC leaky head gasket in reply to wgm, 01-04-2018 17:41:46  
If the seals and mil so they sit flat on the block you can tighten the head bolts till they break and you still will not stop the head/sleeves from leaking. I got a C in years ago that had that problem and could never get it to stop leaking. Use the block with some sleeve I took out of a cracked block and made a good running tractor for a guy



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DrAllis

01-03-2018 14:12:04




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
Earliest engines had 12 bolts or studs. Later engines had 3 extra 3/8" studs on the spark plug side. Sleeves should have been standing up .002" to .005" above the deck surface, never flush. You might try and re-torque all nuts/bolts when COLD and see what happens. That's worth a try instead of ripping it apart.



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Jerry Coulter

01-03-2018 13:28:57




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
That was a chronic problem with the early W engine. Later engines had more studs. I think if you use the suggestions given here, you will overcome that problem.



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KenL

01-03-2018 11:07:03




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
Just did an Oliver 70 that did the same thing. Head was re surfaced, block was off .003"in one spot (that's not where it leaked). Took it apart and used Hylomar. No more leaks.



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DrAllis

01-03-2018 07:17:23




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 06:45:57  
I've worked on those engines for 50 yrs now. I have NEVER had a block surface milled off. If you have skimmed off the top of the block and not cut the sleeve counterbore's deeper, your sleeves are up too high and the gasket isn't getting squished where the water passages are. Copper coat should be OK, but paint 3 coats, letting each one get good and tacky before installation. I use Hylomar sealer myself.

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Matt Reinders

01-03-2018 07:25:18




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 Re: WC leaky head gasket in reply to DrAllis, 01-03-2018 07:17:23  
Thanks for the reply. The sleeves did install flush with the top of the block. I will double check that. My game plan is to remove the head, clean everything up, and redo. This is the first time I have had this problem and I have rebuilt 7 engines, but this is my first WC block.



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old

01-03-2018 08:54:59




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 Re: WC leaky head gasket in reply to Matt Reinders, 01-03-2018 07:25:18  
So you left the sleeve in and had them mill the block right????????? That is a super big no no and is likely to be where your problem is. The sleeve HAVE to stick up just a little bit so as the have the sleeve seal O-ring to seal and to have the head gasket seal correctly



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wgm

01-04-2018 17:44:08




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 Re: WC leaky head gasket in reply to old, 01-03-2018 08:54:59  
Unless I'm missing something I don't remember reading this.



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old

01-04-2018 18:35:43




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 Re: WC leaky head gasket in reply to wgm, 01-04-2018 17:44:08  
Wet sleeve engine so yes the sleeve HAVE to stick up a little or the head gasket and sleeve seals will not seal as they should



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