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Torquing heads sequence?
Posted by: joe moore ()
Date: August 16, 2013 05:51PM

Old topic some guys torque heads by the book some torque by other specific which works the best joe



Edited 1 time(s). Last edit at 08/16/2013 06:08PM by MattNall.

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Re: heads
Posted by: MattNall ()
Date: August 16, 2013 05:53PM

At the recommended today 30 ft. lb.... it doesn't really matter..





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Re: heads
Posted by: joe moore ()
Date: August 16, 2013 05:59PM

Sorry did not mean ft lb I ment bolt. Sequence starting at number 1going to number 2 and so on

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Re: heads
Posted by: MattNall ()
Date: August 16, 2013 06:04PM

Makes no difference in my opinion.... way too low of a torque to warp a head.





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Re: heads
Posted by: joe moore ()
Date: August 16, 2013 06:10PM

OK than why not just torque the head bolts top to bottom rather than Chris cross

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Re: heads
Posted by: MattNall ()
Date: August 16, 2013 06:13PM

Doesn't matter if you snugged them all up 1st...that's usually 10-15 ft. lb.

then it doesn't matter...





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Re: Torquing heads sequence?
Posted by: 66corsa ()
Date: August 16, 2013 06:18PM

don,t you have a factory shop manual? I looked in mine and it says start all nuts to finger tight . then start torque and work towards 40 ftlbs and follow torque sequence as outlined in manual, engine and head assy. section.

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Re: Torquing heads sequence?
Posted by: joe moore ()
Date: August 16, 2013 06:20PM

Matt just said No need to do that

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Re: Torquing heads sequence?
Posted by: MattNall ()
Date: August 16, 2013 06:23PM

66CORSA...... that's old! After 40 -50 years... you go to 40 ft. lb. and you'll most likely pull the studs out of the block.

But the venders love you guys that go by the book!! ggg No one is at fault!! gg





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Re: Torquing heads sequence?
Posted by: joe moore ()
Date: August 16, 2013 06:30PM

The subject is not ft lb it is the ideas some people have regarding. The way the head .bolts. are sequence

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Re: Torquing heads sequence?
Posted by: MattNall ()
Date: August 16, 2013 06:32PM

Joe, please remember...what I write.. is "MY OPINION" only..


But I do have some experience ggg





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Edited 1 time(s). Last edit at 08/16/2013 06:33PM by MattNall.

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Re: Torquing heads sequence?
Posted by: cnicol ()
Date: August 16, 2013 06:33PM

I start at 10#, then follow the sequence in 5# steps up to 30#, then repeat the sequence at 30#. I've built many engines and never a head gasket failure. Why mess with success or take chances on such a simple process?

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Re: Torquing heads sequence?
Posted by: Pacerace ()
Date: August 16, 2013 06:35PM

I followed the sequence and torque in the Fitch How To Keep Your Corvair Alive book. 35 pounds, and a modified pattern from the shop manual.

Now I noticed that the torque does seem pretty low, and assumed this is because the cylinder expands more than the studs and it tightens up when it warms up. Am I correct?

________________________________________________________

Chandler
Roswell, GA.


1965 Corvair Monza 110/4sp Coupe

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Re: Torquing heads sequence?
Posted by: MattNall ()
Date: August 16, 2013 06:36PM

cnicol Wrote:
-------------------------------------------------------
> I start at 10#, then follow the sequence in 5#
> steps up to 30#, then repeat the sequence at 30#.
=====================================================

What I do from habit...


but I doubt it matters...

And I couldn't answer Joes question definitively!





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Re: Torquing heads sequence?
Posted by: MattNall ()
Date: August 16, 2013 06:36PM

Pacerace Wrote:
-------------------------------------------------------
> I followed the sequence and torque in the Fitch
> How To Keep Your Corvair Alive book. 35 pounds,
> and a modified pattern from the shop manual.
>
> Now I noticed that the torque does seem pretty
> low, and assumed this is because the cylinder
> expands more than the studs and it tightens up
> when it warms up. Am I correct?
=====================================================

Correct!





MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
.............................PG...................................Turbo

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Re: Torquing heads sequence?
Posted by: joe moore ()
Date: August 16, 2013 06:43PM

LtHi Chandler. You finally. Got it you use Fitch instead. Of the book any body else use something. Different to sequence their head bolts. Joe

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Re: Torquing heads sequence?
Posted by: Pacerace ()
Date: August 16, 2013 07:36PM

I would quote the book for you, but I don't have it with me. It mentions that a GM mechanic from back then even said it was incorrect and directed fitch towards the proper method.

The pattern:
5-11-1-7-3-9
12-6-8-2-10-4

It basically says this is a typical criss cross which is easy to see, but modified to go evenly over the 3 cylinders instead of crossing each one at a time. It was easy to remember, but annoying because you have to switch sockets for each bolt. I did use a trick for the lower studs as well. A 13/16 spark plug socket fits but has a beveled edge and can slip off if tilted at all. a 3/8 drive socket that fit into the 13/16 spark plug socket without the rubber helped. The 3/8 square fits over the stud threads and prevents the socket from tilted. It didn't noticable damage the threads for me either.

________________________________________________________

Chandler
Roswell, GA.


1965 Corvair Monza 110/4sp Coupe

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Re: Torquing heads sequence?
Posted by: davemotohead ()
Date: August 16, 2013 07:45PM

I follow the book pattern and torque to 30ft lbs,I do it the same as craig,200 engine's or more running good agree.smoking smiley



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Re: Torquing heads sequence?
Posted by: 66corsa ()
Date: August 16, 2013 07:52PM

I agree that with these old engines and metal being old and having gone through many heat and cooling cycles that the factory torque may be too high . give the old alum and steel bolts . that 30 ftlbs should be fine . but I,d still follow the proper sequence . just to make sure I did not pull a stud from the block . well just finished packing heading to az .for other projects.

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Re: Torquing heads sequence?
Posted by: joe moore ()
Date: August 16, 2013 08:27PM

Ha have fun stay safe joe

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