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Discussion Forum
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Head bolts

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Dale

06-03-1999 06:38:18




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just got my H running again :-)
as a rule of thumb, how long (hours) should I run before re-setting the torque on the head?




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The Red

06-03-1999 09:25:47




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 Re: head bolts in reply to Dale, 06-03-1999 06:38:18  
Dale, I ran mine 2 hours and retorqued. All 16 bolts had backed off of 70 foot pounds considerably. I had two down to 40 foot pounds. I retorqued also at hour 7 and the bolts around #2 and #3 cylinders were around 60 foot pounds. The two center bolts were at 50.

I am going to re torque again at hour 30. I am 2 hours away from reaching 30.



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Dale

06-07-1999 07:30:43




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 Re: Re: head bolts in reply to The Red, 06-03-1999 09:25:47  
Thanks, I spent an hour cutting one small pasture then checked, all where down to about 65-70fp.
I've got another five and a seven acre field to cut, guess I'll check it after each and see what I find.



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Ronnie

06-03-1999 07:03:05




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 Re: head bolts in reply to Dale, 06-03-1999 06:38:18  
You don't have to retorque a head. Or did you see that you need to retorque the head on a H?



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Paul Fox

06-03-1999 08:50:02




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 Re: Re: head bolts in reply to Ronnie, 06-03-1999 07:03:05  
Any good engine builder will tell you that you ALWAYS have to retorque the head bolts. Actually, it's a good practice to do it at least twice.

The first time is after the engine is brought up to operating temperature the first time and allowed to cool back down. You will most likely notice quite a bit of slack.

The second time should be after a few hours of normal operation (5 or so). Lots of folks do it when they do the first oil and filter change after the rebuild. If didn't rebuild, but just had the head off for a valve job or something, I'd do it after 3 to 5 hours just to be sure.

This procedure is necessary because the head gasket compresses a little, and the temperature cycling expands and contracts the metal in the block, head and headbolts at slightly different rates.

For the few minutes it takes, it's cheap insurance, and a lot less hassle than a blown head gasket.

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