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Is it still necessary to Re-torque head after over

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ddg

02-13-2005 07:10:13




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Just got the Super A back together & running. The head was baked & shot peened, milled .015, all new valves & guides, hardned steel inserts under the intake valves, shimmed springs, the whole deal. The rocker arms were ground for new fit on the valve stem, new pistons, rings, sleeves & wrist pins. New wrist, rod & main bearings, rebuilt oil pump. etc. The head gasket said to "seal & re-torque". In this day & age, is it still necessary to re-torque the head? How is that done correctly? Do you just give them all a quarter turn more, or should you loosten them first then tighten again? I went to 65-70 lb. ft. when I put it together.

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gene b

02-13-2005 13:50:09




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
The head gasket said to re-torque.



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John In Iowa

02-13-2005 12:25:10




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
Yes you have to Re-torque the head. Also while you got it warmed up you will need to reajust the valve clearest because of moving the head.

John In Iowa



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CNKS

02-13-2005 09:15:26




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
Without reading the rest of the posts, the revised spec is 80 ft lbs, you retorque to that spec. In your case since you used 70 ft lbs first, I would retorque to 80 ft lbs TWICE. Don't loosen first. You retorque when the engine is hot.



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ddg

02-13-2005 08:52:02




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
I guess I will re-torque it first chance I get. I've started it a couple of times & drove around a little, & got it warmed completely up. I really need a better wrench, mine is an old one with the pointed spring bar, not the click type. The machine shop put the inserts under the small valves, said they weren't needed on the exhaust, unless I misunderstood him. Hate to take the head off to look!



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John In Iowa

02-13-2005 12:30:15




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 08:52:02  
If you take the head off you will have to get a new head gasket. You use them ONLY ONCE.

John In Iowa



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dr.sportster

02-13-2005 11:12:16




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 08:52:02  
ddg,Sorry for all the small posts but one other thing that old beam type torque wrench your using is fine.Just make sure to keep your forearm at a right angle to the wrench handle and "float" the handle.



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dr.sportster

02-13-2005 09:25:16




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 08:52:02  
ddg,The small valves are the exhaust valves. the exhausts probably got the new seats.



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lee

02-13-2005 09:25:08




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 08:52:02  
the exhaust valves are the small valves. I'd just pull the torque up to spec and be done with it.



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Ebbsspeed

02-13-2005 08:41:46




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
Did you put the hard steel inserts under the intake, or exhaust valves? Usually they are put under the exhaust.



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riverbend

02-13-2005 07:42:41




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
You need to get the motor up to operating temperature and retorque the head. When you do it, you will probably find that the nuts are down to around 50-60 ft.lbs.

Some say that the nuts should be loosened a quarter turn so that the static friction does not give you a false sense that they are still to spec. I have always found that the nuts are so loose, it takes a couple steps to get them back up to the torque spec. And then a couple more rounds until they are all evenly tight.

Today might be this day and age, but the motor is still from the old days. You will need to re-adjust the valves after you retorque the head.

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Red Dave

02-13-2005 07:38:50




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
Yes, re-torque is still necessary.
You will probably be surprised at how much movement you get.



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partsman

02-13-2005 07:36:24




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
Yup,, it's still a good idea to retorque. After the engine warms up the heat will cause expansion and make things move about. to retorque, just set the torque wrench to the same spec you used the first time and check hem all in he proper order. Some may tighten a bit more, some might not.



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dr.sportster

02-13-2005 07:35:29




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 Re: Is it still necessary to Re-torque head after in reply to ddg, 02-13-2005 07:10:13  
When you put it together you either used 65 or 70 not 65-70.Anyway I believe you should retorque unless you use red loctite on the threads and go to the high side of the torque specs.Even with loctite there is no garantee that it wont be required.You would just set the wrench and tighten in that direction not reloosen first.The instructions with the wrench are important.Lots of people hold the torque wrench incorrectly causing false readings.Basically how do you know if you have to retorque unless you try the torque wrench on the motor and check tightness.

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ddg

02-15-2005 13:37:37




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 Re: Is it still necessary to Re-torque head after in reply to dr.sportster, 02-13-2005 07:35:29  
I just re-torqued it this morning, and was surprized how much it had changed in a week since I put it back together. I torqued it to about 70 lbs. when I put the head back on last week. This morning, I put the wrench on it again, and the nuts started turning at about 45lbs! I took them up to 80lbs. this time, put the rocker back on, & set the valves to .014 again while still warm. Good advice here, Thanks all..... .DDG

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