Head torque specs and sequence

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Danthesignman
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Head torque specs and sequence

Post by Danthesignman »

I`m torqueing heads on a 140 tomorrow and have no manual and no idea . Help please , trying to get to the convention .

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terribleted
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Re: Head torque specs and sequence

Post by terribleted »

Torque spec is 32-38 ft lbs. Pattern is as follows: XXX are upper nuts or rocker studs looking at the head from teh valve cover side

-12--------8--------1---------4--------6--------10
XXX-----XXX-----XXX-----XXX-----XXX-----XXX


-11-------7---------3---------2--------5--------9
XXX-----XXX-----XXX-----XXX-----XXX-----XXX

hope that helps.
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Danthesignman
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Re: Head torque specs and sequence

Post by Danthesignman »

Very Cool ! , If I bust ass I can get the thing running by tomorrow .
Thank You !

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Mcwho
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Re: Head torque specs and sequence

Post by Mcwho »

Terrible,
Are your head studs torqued ok, didvu use heli coils, time serts, or original block threads. Any pull out?

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azdave
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Re: Head torque specs and sequence

Post by azdave »

Note this thread is originally from 2010.

Most Vair experts these days (2020) recommend torquing at 30 ft# max to prevent pulling the studs out of the engine case no matter if they have original threads or use repair inserts. Some rebuilders will use a piece of sturdy pipe to test each stud individually at 35 ft# before they actually install the heads and torque to 30 ft# so that if one threaded hole is weak they will find it earlier while the case is still apart and easier to repair.
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terribleted
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Re: Head torque specs and sequence

Post by terribleted »

I also always torque to 30 foot pounds. Above I gave the shop manual spec and copied and pasted that diagram from somewhere.
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
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66vairguy
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Re: Head torque specs and sequence

Post by 66vairguy »

Per Azdave the general consensus is to use 30 ft lbs. for the head torque, then recheck after some time to "settle". The manuals had several different ratings, all seem to be too high. The caveat here is the stud threads must be clean and smooth.

I've never had a head gasket leak using 30 ft lbs.

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Re: Head torque specs and sequence

Post by bbodie52 »

Danthesignman wrote: » Fri Jun 18, 2010 10:36 pm

I`m torquing heads on a 140 tomorrow and have no manual and no idea...
Cylinder Head Torque Detail.jpg

A 13/16" Deep Socket and 9/16" Socket is needed.
HEADNUTS – ORIGINAL STYLE:
Used ONLY on Upper Head Studs These have the original style built-in “collar”, (just a flat washer under a regular nut is not suggested). Our head nuts are heat treated & have been tested to over 55 ft/lb., however, they should not be reused after the engine is run & the nuts removed. Head nuts and rocker studs should only be torqued 32-34 ft/lb. For all Corvairs. 12 needed to do two (2) heads.

CHROME ACORN NUTS: Install after the headnuts to keep the ends of the studs from rusting (for upper studs).
:link: https://ssl.corvair.com/user-cgi/catalo ... ow_page=13


Image

Part number C1089: NUTS-HEAD-SET 12 PLATED (SET 6=C4633) CHROME ACORN NUTS TO COVER END OF STUD =C3413

Weight: 0 lbs 6 oz
Catalog Page(s): 13(69),20,181,329,OT-4 40(RM19)
Price:
1 - 1 $ 6.20


Image

Part number C3413: NUTS-12 CHROME ACORN-UPPER HEAD STUDS

Weight: 0 lbs 6 oz
Catalog Page(s): 13(69),20,181
Price: $ 15.20


The link below will provide you with a list of useful websites that are Corvair-related. Some of the links will lead you to an extensive technical library that will allow you to download shop manuals and other technical references in Adobe Reader format at no cost. There is also a link that will help you to locate nearby CORSA (Corvair Society of America) club chapters. You will also find a list of essential Corvair parts suppliers. Clark's Corvair Parts in Shelburne Falls, MA is the biggest and oldest Corvair supplier in the world. You will find a link that can provide you with a series of videos that amount to a tour of the Clark's Corvair Parts facilities. Parts suppliers such as this truly make our Corvair hobby possible.

Common and Useful Corvair Websites
:link: viewtopic.php?f=225&t=6007

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Attachments
1965 Corvair Chassis Shop Manual - SECTION 6 - ENGINE.pdf
1965 Corvair Chassis Shop Manual - SECTION 6 - ENGINE
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Brad Bodie
Lake Chatuge, North Carolina
Image 1966 Corvair Corsa Convertible

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