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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

torque specs for head bolt on a Farmall A!

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CARL C. CUMMINS

01-03-2006 08:27:57
68.250.130.130



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I have a blown head gasket (mostly just leaking) on my 1939 Farmall A! Im getting ready to replace it and I need to know the torque specs for the head bolts (studs)! I also priced new head bolts (studs) from my local dealer. I just about fell over when he told me $10.81 each. For those who are not sure there are 9 studs! Anybody know a less expensive place to buy? Thanks in advance for any help!

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BillWV

01-04-2006 05:21:23
129.71.136.189



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 Re: torque specs for head bolt on a Farmall A! in reply to CARL C. CUMMINS, 01-03-2006 08:27:57  
The head bolts that need to be replaced are the torque-to-yield type. They are typically torqued in steps up to a certain torque, then an additional twist of 1/4 or 1/2 turn is added. They are stressed to material yield; if you looked at a used one, you"d see they are longer and smaller in diameter than an unused bolt. Using one a second time would break it.

They are used in specific applications; the only place I"ve seen them are on modern autos.

I"d think that head bolts on an A could be used forever as long as the threads are OK and aren"t corroded too bad or otherwise damaged.

Good luck,
Bill

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Red Dave

01-03-2006 10:46:36
24.104.94.34



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 Re: torque specs for head bolt on a Farmall A! in reply to CARL C. CUMMINS, 01-03-2006 08:27:57  
Older manuals call for 65 ft/lbs. I have a newer Case/IH publication that specifies 80 ft/lbs on A&B headbolts.

Webers Reference page calls for 80 ft/lbs.

I've used 80 ft/lbs on the last couple I've done with no trouble.



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EL Toro

01-03-2006 09:22:45
205.188.117.73



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 Re: torque specs for head bolt on a Farmall A! in reply to CARL C. CUMMINS, 01-03-2006 08:27:57  
If the threads are ok I would use the old studs.
Some autos had head bolts that you were suppose to use once. What size are the studs? Hal



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jnewark

01-03-2006 08:48:18
167.21.254.13



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 Re: torque specs for head bolt on a Farmall A! in reply to CARL C. CUMMINS, 01-03-2006 08:27:57  
my IT manual says 65 ft-lbs... when tightening them I usually do every other one..then come back and do the ones I skipped..torque to ~55 ft lbs.. then do the final torque of 65 ft lbs.. let her set for a few days and retorque,,, or run her for a half hour.. let her cool then retorque... why do you want to replace the studs??
jack



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CARL C. CUMMINS

01-03-2006 08:55:34
68.250.130.130



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 Re: torque specs for head bolt on a Farmall A! in reply to jnewark, 01-03-2006 08:48:18  
I always heard at it is a good rule of thumb to replace the head bolts whenever you replace the head gasket! At $10.81 each I may ignore that rule! Thanks for the help!



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Janicholson

01-03-2006 10:40:32
199.17.6.162



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 Re: torque specs for head bolt on a Farmall A! in reply to CARL C. CUMMINS, 01-03-2006 08:55:34  
The rule of thumb was pointing directly at the parts counter bottom line.
Bolts that have pulled or damaged threads, or are corroded/pitted should be replaced (in this case with used bolts. Aircraft, some specialty engines, and race cars may require, or afford new bolts.
I tighten from the center to both ends in 4 stages. 1/4 of torque spec, 1/2, 3/4, and full.
JimN



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