Torqued Head Bolt Out Of Order
11-25-2012, 01:23 AM
#1
Torqued Head Bolt Out Of Order I'm putting my heads on my ls1 block with an MLS .040 Cosmetic gasket and GM Bolts. I got the entire first sequence down (22 ft. lbs), then on the second pass when you have to torque them the 90 degrees, I did 1-6 good, but accidently skipped 7 
. I did 8,9 then saw I missed 7 and did the 90 degrees on that then 10. Anyway, Will I still be ok or do I need to get all new bolts and do them again? If I do, can I still use the head gasket again since it wasn't heated up? Thanks
. I did 8,9 then saw I missed 7 and did the 90 degrees on that then 10. Anyway, Will I still be ok or do I need to get all new bolts and do them again? If I do, can I still use the head gasket again since it wasn't heated up? Thanks 
11-25-2012, 06:58 AM
#2
Never reuse the gasket once it has been torqued down and compressed. The head bolts are also torque to yield and shouldnt be reused.
Now whether or not you need to do it all over again I cant say for sure, but I would. Nothing like putting it all back together to find a leak.
Now whether or not you need to do it all over again I cant say for sure, but I would. Nothing like putting it all back together to find a leak.
11-25-2012, 02:51 PM
#6
ModSquad
iTrader: (6)
I am a firm believer in using a sequence in head bolt torquing. I have been involved in builds from stock to cup level stuff, and always used a sequence...
BUT...I watched the gearz episode where he went to GM's high performance engine assembly plant, and when they got to the head installation booth, there was this giant machine that you pulled down, and it torqued the entire head at once. No steps. No sequence. Nothing. Done.
If you were assembling a high compression race engine, then I'd be concerned. If I were you, I'd run it.
BUT...I watched the gearz episode where he went to GM's high performance engine assembly plant, and when they got to the head installation booth, there was this giant machine that you pulled down, and it torqued the entire head at once. No steps. No sequence. Nothing. Done.
If you were assembling a high compression race engine, then I'd be concerned. If I were you, I'd run it.
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11-25-2012, 03:24 PM
#10
The main concern is warping the head by uneven clamp. Usually a rule of thumb is starting in the middle and working outwards. By looking at the diagram, looks like you still met the intent. A head doesn't know which side you did first.
As discussed before, the machines do them at the same time because it creates an even clamping force. Since we only have 2 hands, we progressively work towards it.
As discussed before, the machines do them at the same time because it creates an even clamping force. Since we only have 2 hands, we progressively work towards it.
11-25-2012, 04:31 PM
#11
The main concern is warping the head by uneven clamp. Usually a rule of thumb is starting in the middle and working outwards. By looking at the diagram, looks like you still met the intent. A head doesn't know which side you did first.
As discussed before, the machines do them at the same time because it creates an even clamping force. Since we only have 2 hands, we progressively work towards it.
As discussed before, the machines do them at the same time because it creates an even clamping force. Since we only have 2 hands, we progressively work towards it.
12-07-2012, 11:33 PM
#13
I once over torqued a top center head bolt and snapped it off. I never replaced it and ran it in an ms3 cammed lq motor for almost a year without a single problem and the bolt twisted off in the block. Not advising it obvously but we all do stupid things and its not always the end of the world,
12-10-2012, 09:06 AM
#14
I once over torqued a top center head bolt and snapped it off. I never replaced it and ran it in an ms3 cammed lq motor for almost a year without a single problem and the bolt twisted off in the block. Not advising it obvously but we all do stupid things and its not always the end of the world,
