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Farmall & IHC Tractors Discussion Forum
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Head gasket sealing?

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leon

11-07-2006 18:03:34




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OK, I have another new head gasket for my SC ordered from Case-IH. Last time I cleaned surfaces good, used copper spray from NAPA and starting at the middle first, torqued her down in increments to a final torque of 80 lb-ft. Still she leaked on the RH side. This time I have checked to be sure the head is flat. Using the best straight edge I have, it looks good to me. What other suggestion might there be to assure success this time?

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Elk Farmer

11-10-2006 12:45:53




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
On my 1940 H there is seepage (sp) at the head gasket on both right and left sides but it's not coolant it's oil. I have not had the head off because the engine runs great. Could this be a bad head gasket or could there be a crack in the head some where or both.

Thanks
Carl from Michigan



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Gauger

11-08-2006 10:25:31




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
Check the sleeve protrusion above the block. Put your straightedge across the top of the sleeves and use a feeler gauge. It must be .003" - .005".
Any more than .005 and you are in the leak zone. All the copper spray in the world won't fix it. The right side is always the first to leak because of the location of the head studs. The studs on the left are close to the edge of the head and can pull it tighter whereas the studs on the right are set in alot farther and have more gasket to compress. I wasted two gaskets figuring this out on my SC. My new sleeves stuck up almost .009" and I figured that the deck of the block had been milled for a previous rebuild which in effect made the sleeve counterbores too shallow. I had to remove the sleeves and face the tops off to achieve the right protrusion and she sealed right up. Let me know how you make out.

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leon

11-08-2006 03:48:54




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
Forgot to add that I did retorque hot - a couple of times! It did appear to bee seeping at the gasket, not at a head crack. Perhaps the suggestion of some stop-leak is a really good one, especially with this cantilevered right hand side type of head design.



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Doc Larry

11-08-2006 19:15:13




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 Re: Head gasket sealing? in reply to leon, 11-08-2006 03:48:54  
The head can be cracked on the contact with the gasket. Consider that if head cracks were easy to see, good machine shops wouldn"t go to the trouble of magnafluxing every head they rebuild.

To me, stop-leak is just a band aid, but I realize some people have good luck with it.

Let us know what you find,

Larry



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Doc Larry

11-08-2006 01:36:07




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
Most automotive machine shops can magnaflux the head for a fairly low price.

Larry



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Tom Windsor

11-07-2006 22:29:46




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
If you have done what you say, and have retorqued it after running it a while and it still leaks, I would suspect a hairline crack in the head or block that opens up when hot. I am not sure that is probable, but, if it continues to leak, after checking and finding the block and head true and not warped, and after proper torque, that is the only remaining alternative. I would then pour some of the magic stuff into the water and let it run till it stops leaking.

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K.B.-826

11-07-2006 20:32:59




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
I agree with old. Sometimes a head gasket will seep a little coolant until it is retorqued hot. Best way to retorque is to get the engine good and warm, wait until it has cooled down just to the point where you can stand to work on it. Then, one at a time, crack each bolt loose and take it right back up to the torque spec.



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Janicholson

11-07-2006 20:24:31




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
The block could be non-true check it with the straight edge. use a .001 feeler under it all along to find low spots. The head the same way. I agree with aluminum paint, or spray on copper coat. JimN



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gene bender

11-07-2006 18:33:52




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
I give mine a couple coats of hi-temp aluminum paint. Been doing that for yrs with no problems.



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old

11-07-2006 18:21:54




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 Re: Head gasket sealing? in reply to leon, 11-07-2006 18:03:34  
Did you returque the head bolts after you had run it for about and hour or so?? If you didn't then that could be where your problem was.



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