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head bolt torque

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02 Jun 2021 16:34 #43289 by Laurent
head bolt torque was created by Laurent
Hello
I am replacing the head gaskets on a Cord 812 and I don't know the 7/16 bolt torque? I have checked the manual but there is no information about torque specs of the head bolts. Any recommandations/advice here?
Thank you very much
Laurent

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02 Jun 2021 21:08 #43293 by 1748 S
Replied by 1748 S on topic head bolt torque
Your best bet is to find the specs for the 7/16 fine thread bolts because back when the Cord engine was made no torque wrenches were used or made . We have several engine rebuilders reading this and Stan Gilliand of Kansas has all the now used torque values.


Gary Parsons
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  • Terry Cockerell
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02 Jun 2021 22:22 - 02 Jun 2021 22:27 #43296 by Terry Cockerell
Replied by Terry Cockerell on topic head bolt torque
You can purchase a book called Cord 810 812 Service Manual from the museum in Auburn which covers a lot of maintenance work on the cars.
In the books it states.
If the block threads are in perfect condition, 55 to 60 lb/ft cold, beginning at 45 then 50 and finally 55. Start engine , warm it up, let it cool then retorque heads.
If the threads are not so good, 45 to 50 lb/ft cold, beginning at 35, then follow the above procedure.
You must use Permatex Aviation Sealer on the threads to stop coolant leaks and also to prevent the bolts and block threads rusting together.
The attached diagram shows the bolt tightening pattern supplied with Higman heads with the deeper coolant jackets.
The procedure is the same for original heads.

T cockerell
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Last edit: 02 Jun 2021 22:27 by Terry Cockerell. Reason: Adding picture and revising text
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03 Jun 2021 00:39 #43298 by mikespeed35
Replied by mikespeed35 on topic head bolt torque
I torque heads, let engine set for 24 hrs without starting it. Retorque the heads then start it etc. You will be surprised how much the torque relaxes in that 24 hrs. with out starting it.
CORDiallyMike

Mike Huffman

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03 Jun 2021 05:17 #43300 by Terry Cockerell
Replied by Terry Cockerell on topic head bolt torque
Interesting comments Mike, never checked that.
Actually these postings are in the wrong location. How can they be moved?

T cockerell

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07 Jun 2021 14:07 #43310 by Laurent
Replied by Laurent on topic head bolt torque
Thank you very much Terry, Garry and Mike for these useful pieces of information.
I will put the heads back today and we shall see....
Thanks again
Laurent

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