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Tractor Talk Discussion Forum

re-torque head bolts?

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Josh in Pa

12-05-2006 08:17:21




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I am rebuilding an Oliver 1655 diesel. The manual says to torque the head, warm the tractor up to operating temperature and re-torque the head. Do I re-torque the head while the tractor is hot, or let it cool down and then re-torque it? It makes sense that the bolts will stretch a little when hot, so will need to be tightened up a bit to reach the same torque.
Josh




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the tractor vet

12-05-2006 08:26:09




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 Re: re-torque head bolts? in reply to Josh in Pa, 12-05-2006 08:17:21  
Ya get the tractor UP TO operating temp and that means up to 180-200 degrees and just as fast as you can you do the retorque YOU DO NOT LET IT COOL . Now also the head bolt on the i think the right rear corner that is the bolt that oils the rocker arms this bolt DOES NOT GET TORQUED DOWN AS MUCH , now it has been a few years since i have done and oliver and i am thinking that that hollow bot only gets pulled down to like 90-95 ft. lbs. and the rest are now here i am a bit foggy but thinking 110-115 on the rest or is it 115-120 not sure here but the oil hole bolt only gets 90-95 .

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Josh in Pa

12-05-2006 08:52:49




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 Re: re-torque head bolts? in reply to the tractor vet, 12-05-2006 08:26:09  
You've got a pretty good memory! The manual gives the torque for the bolts, and then a lower number for the corner one that supplies oil. I think I read an earlier post when it was suggested to torque to 75% cold and then finish it hot. Is this a good idea or not? I would be worried that without being torqued all the way the head gasket could blow? The tractor had the head and block resurfaced, and the counterbores were redone. What do you think about the spray on sealants? Should I use one or put it together dry?
Josh

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the tractor vet

12-05-2006 12:52:55




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 Re: re-torque head bolts? in reply to Josh in Pa, 12-05-2006 08:52:49  
This is the way i have been doing it since i was taught back manymany moons ago , First ya cgase all the head bolt holes in the block with a bottoming tap then using either or laquar thinner or carb spray cleaner to gut the oil and grease then blow dry then clean and chase all the head bolts and wash them and dry them , then lube the thread litely with white grease copper coat the head gskt both sides and using dowel bolts to guide the head down on and also hold the head gskt. install all the bolts and starting in the center and going by the book tighten them down in three setps starting at around 35-40 ft.lbs. next between 65-85 then to the final torque then set valves put the oil and WATER to her then run her to working temp and i like to let them run in for over a half hour to and hour under somewhat of a load so everything gets warmed up but if ya don't have a dyno then cover the raditor and watch the temp. gauge and let her get up to mid range in the work zone and stay there for a spell so everything is warmed up . Then gp back around all the bolt in order pullen them down to the limit and if your usen a clicker torque wrench then i like to hear her click three times on each bolt . then reset the valves and go over them a couple times and your good to go.

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buickanddeere

12-05-2006 15:18:43




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 Re: re-torque head bolts? in reply to the tractor vet, 12-05-2006 12:52:55  
Correct. The only thing I can thik to add is that new fasteners are cheap insurance.



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the tractor vet

12-05-2006 18:11:29




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 Re: re-torque head bolts? in reply to buickanddeere, 12-05-2006 15:18:43  
Hey this is and Oil ALL OVER and they are not needed as like on the newer deeres or the new cars and trucks . Now sometimes the right rear head bolt has to be replaced because someone over torques it and breaks it as the first one that my buddy and i did we did that sooooo o we know now .



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buickanddeere

12-06-2006 19:23:11




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 Re: re-torque head bolts? in reply to the tractor vet, 12-05-2006 18:11:29  
Doesn't matter the age or manufacture. Fasteners age and who knows who may have damaged them in the past? New fasteners are cheaper than doing the job over again.



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