Head torque specs and sequence
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Head torque specs and sequence
I`m torqueing heads on a 140 tomorrow and have no manual and no idea . Help please , trying to get to the convention .
- terribleted
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Re: Head torque specs and sequence
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.
-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.
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia
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- Posts: 66
- Joined: Wed Jan 20, 2010 5:53 pm
Re: Head torque specs and sequence
Very Cool ! , If I bust ass I can get the thing running by tomorrow .
Thank You !
Thank You !
Re: Head torque specs and sequence
Terrible,
Are your head studs torqued ok, didvu use heli coils, time serts, or original block threads. Any pull out?
Sent from my SM-G965U using Corvair Forum mobile app
Are your head studs torqued ok, didvu use heli coils, time serts, or original block threads. Any pull out?
Sent from my SM-G965U using Corvair Forum mobile app
1965 Corvair Monza Coupe 110, 4 speed, Liberty Blue
Re: Head torque specs and sequence
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.
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.
Dave W. from Gilbert, AZ
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
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Re: Head torque specs and sequence
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.
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia
Currently working full time repairing Corvairs and restoring old cars.
https://www.facebook.com/tedsautorestoration/
Located in Snellville, Georgia
Re: Head torque specs and sequence
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.
I've never had a head gasket leak using 30 ft lbs.
- bbodie52
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Re: Head torque specs and sequence
Danthesignman wrote: » Fri Jun 18, 2010 10:36 pm
I`m torquing heads on a 140 tomorrow and have no manual and no idea...
A 13/16" Deep Socket and 9/16" Socket is needed.
https://ssl.corvair.com/user-cgi/catalo ... ow_page=13HEADNUTS – 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).
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
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
viewtopic.php?f=225&t=6007
- Attachments
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- 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
1966 Corvair Corsa Convertible
Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible