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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Re-torquing head bolts-1655 diesel

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Josh in Pa

12-30-2006 14:40:06




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I am rebuilding a 1655 diesel and was advised to get it hot, and re-torque the head bolts while it was hot. I have also read about torquing 10-20% over to help retain the head gasket. While putting it together I noticed that you can't torque the head bolts with the rocker arms in place. What have you done before? Get it hot, take it apart quick, and re-torque? How much over-torque is a good idea? The block has been resurfaced and the counterbores redone, and the head has been surfaced as well. The tractor gets used a lot, so I want to make sure it will be reliable.
Josh

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Don-Wi

12-30-2006 17:57:41




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 Re: Re-torquing head bolts-1655 diesel in reply to Josh in Pa, 12-30-2006 14:40:06  
The re-tourque is the one thing I missed when I first rebuilt my 1600 (gas), so after about 10-12 hours I was getting compression in the radiator and it was over heating. I had to remove the head and clean both surfaces and install the new gasket. I then let it run for about 15-20 minutes and then retourqued them. Now about 80 hours on the engine and no more problems. Shoulda done it in the first place, woulda saved me a heck of a lot of trouble...

Donovan from Wisconsin

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J Schwiebert

12-30-2006 14:49:04




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 Re: Re-torquing head bolts-1655 diesel in reply to Josh in Pa, 12-30-2006 14:40:06  
You asked. Are you putting the head on? What did you lube the bolts with? Did you put a drop of oil or other suitable lube under the head of the bolt. If you torque it, bring it up to the minimum torque spec. Get it at operating temp and retorque it and then tighten to the maximum spec. If a bolt does not give which happens once in a while, loosen that bolt 1/4 turn and then bring it to the maximum torque value. How much liner protrusion do you have are all 6 within 002? DO not overtorque!. After 130-150 hours recheck it. I still need some dimension from you. You also need an offset wrench available from tool trucks to this. It may be cheaper to remove the rocker arms. More questions? J.

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Josh in Pa

12-30-2006 14:58:31




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 Re: Re-torquing head bolts-1655 diesel in reply to J Schwiebert, 12-30-2006 14:49:04  
Liners protrude .002, all within .001. I lubricated the bolts with white grease, and a little dab under the washer as well. I will get it warmed up to operating temperature, take the rocker arms off, and re-torque to max specs. The piston height before the rebuild was .006 below the block surface, within .002 of each other. Thank you for the help,
Josh



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Josh in Pa

12-30-2006 15:01:13




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 Re: Re-torquing head bolts-1655 diesel in reply to Josh in Pa, 12-30-2006 14:58:31  
The liner protrustion may be .003, I can't remember and it is written in the shop, but they were all close to each other, within .001 for sure, and maybe closer to .0005.
Josh



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