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Farmall & IHC Tractors Discussion Forum
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Re Torqueing a Cylinder Head

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scott#2

05-26-2006 19:02:12




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I was wondering what the best way to re torque a head is. After it has a few hours of runtime on it, do you back the bolts off and them re torque? Or do you just set the wrench and tighten them clockwise only, as if to see if any bolts backed off?

Just wondering
Thanks scott#2




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the tractor vet

05-27-2006 17:49:15




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
Well this subject is like A$$ HOLES, everybody has there way and now that i am pushen 60 years old and built many engines the only thing i have found is that if you run the engine to operating temp and i don't mean for five or ten mins. and the oil temp is up to operating temp and water temp is where it should be i toqure them down and have never found a tight head bolt or stud if you take pressure off i have tryed this and ended up with a coolant leak now if your tryen to retorque a cold engine then why bother . Chase all bolt holes with a bottoming tap and chase the threads on the bolts or studs and if it has studs then chase the nuts and make sure that they turn freely into the hole that they are going start with clean dry holes and lightly lube the threads and the bottom side of the bolt or nut and put the darn thing together and then run it till it is hot then retorque and be done with it this is not rocket sicense . And if you are in doubt then have someone that knows what he is doing to help ya .

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ddg

05-27-2006 14:05:04




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
I always like to tighten stuff till it strips, then back off half a turn.



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MagMan

05-27-2006 03:18:06




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
HI SCOTT, I would not follow the directions below unless you want to break the studs. I have been a mechanic for years and the correct way is to lossen the nut. Or back it off a little then retorque. Otherwise you take the chance of streching it just enough where it may break. Believe me I have seen stuberen people do it the other way and pay ten bucks a piece for head studs and pay to have there torque wrench checked. and still break studs becuase they were trying to retorque the nut and each time before it clicked it streched it enough to break. With the new type clicker wrenches it should not happen but it does sometimes. JON

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tom windsor

05-26-2006 21:49:16




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 Re: What are the torque values in reply to scott#2, 05-26-2006 19:02:12  
What are the torque values 80 ft/lb?



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riverbend

05-26-2006 20:34:26




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
The coeffiecient of static friction is higher than that of sliding friction, but everytime I have retorqued a head, static friction was not a issue. The bolts always take 1/4 turn or so to come up to spec. Either way will be fine as long as you re-retorque it.

Greg



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Phlogiston

05-26-2006 19:54:59




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
Don't forget to recheck the valve lash.

Phlogiston



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CNKS

05-26-2006 19:37:31




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
Probably does not make a whole lot of difference, and I'm not the expert. But, I have read on this forum, or perhaps on Tool Talk that you are supposed to loosen first, the re-torque. The reason being that(if this is correct) it takes more torque to get the bolt/nut to begin turning than it does to turn it after starting, theoretically giving a false low reading. That is you need a smooth pull from start to finish. I do not know.

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Jim Broughton

05-26-2006 19:25:38




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
Scott; Phil's answer is correct, also, most IH engines have a particular sequence to follow when torquing , use that same sequence when re-checking or re-torquing your engine. Best of luck. Jim



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Phil Creek

05-26-2006 19:11:03




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 Re: Re Torqueing a Cylinder Head in reply to scott#2, 05-26-2006 19:02:12  
You never loosen a bolt after you have torqued it..you just place the torque wrench on the head of the bolt and retorque it..just as if you had just installed the bolt. Yes, you are checking to make sure that after warming the engine up that the bolt is correctly torqued. The only time you would loosen a bolt after torqueing it would be if you are checking bearing clearances.



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Phil Creek

05-26-2006 19:14:23




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 Re: Re Torqueing a Cylinder Head in reply to Phil Creek, 05-26-2006 19:11:03  
Let me rephrase my reply..I was refering the farmall engines only.



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