torque settings

J

joe williams

New member
Oct 31, 2016
31
0
0
can anyone tell me if there is some place that lists all the torque settings for the gmc , I have all manuals but can't find any spec on thermostat
housing if there is one .
thanks
Joe
--
Joe Williams
1978 Royale rear twin
 
Look under Engine section .

> can anyone tell me if there is some place that lists all the torque
> settings for the gmc , I have all manuals but can't find any spec on
> thermostat
> housing if there is one .
> thanks
> Joe
> --
> Joe Williams
> 1978 Royale rear twin
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
Joe,
The torque requirements are scattered thru out the manuals either in the
section that you are using or at the end of most sections. If you go to
X7725 Section 6a page 68+ you can find most of the engine torque
specification. The thermostat housing is apparently not listed. It is
5/16 bolt and I would suggest no more than 12 to 15 FT/LBS as you can strip
out the treads out if you have an aluminum manifold. You should also be
using the correct sealant.

Thermostat gasket:

<
https://www.autozone.com/gaskets/performance-thermostat-gasket/mr-gasket-performance-thermostat-gasket/153321_957471_0
>

Correct sealant, must be compatible with glycol type coolants, the red,
blue and black silicone sealants are not the best for this application:

<
https://www.autozone.com/sealants-glues-adhesives-and-tape/gasket-sealant/j-b-weld-water-pump-and-thermostat-housing-gasket-maker-and-sealant/848004_0_0
>
or
<
https://www.autozone.com/sealants-glues-adhesives-and-tape/gasket-sealant/permatex-water-pump-and-thermostat-rtv-silicone-gasket/516195_0_0
>

J.R. Wright
GMC Great Laker
GMC Great Laker Tech Editor
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 30' Stretch
75 Avion (Under going Frame up Restoration)

On Sat, Mar 31, 2018 at 11:06 AM, Jim Kanomata
wrote:

> Look under Engine section .
>
>

>
> > can anyone tell me if there is some place that lists all the torque
> > settings for the gmc , I have all manuals but can't find any spec on
> > thermostat
> > housing if there is one .
> > thanks
> > Joe
> > --
> > Joe Williams
> > 1978 Royale rear twin
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
I recently replaced a thermostat on a 403 and have done so on 455s including mine. Go lightly on the torque. You are not holding anything on like a
wheel that has any mechanical stress on it. The housing bolts go through the manifold and into the coolant / water carrying area of the manifold.
There is not many threads there as the area is very thin. If you do not put sealant on the threads of those bolts, coolant sometimes seeps up the bolt
threads and on to the top of the manifold.

I use aviation Permatex on the bolt threads before installing. It is available at most auto parts stores. I stick the gasket to the clean thermostat
housing surface using anything. Permatex or silicone will work. You are only holding it in place during installation not trying to seal with it. I
let the gasket do the sealing and put nothing on the manifold surface side of the gasket.

So go light on the torque 10 or 12 ft pounds will do.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
I did an Internet search for" torque specs Olds 455” and in four different places found it listed at 20lb-

Emery Stora
77 Kingsley
Frederick, CO

>
> Joe,
> The torque requirements are scattered thru out the manuals either in the
> section that you are using or at the end of most sections. If you go to
> X7725 Section 6a page 68+ you can find most of the engine torque
> specification. The thermostat housing is apparently not listed. It is
> 5/16 bolt and I would suggest no more than 12 to 15 FT/LBS as you can strip
> out the treads out if you have an aluminum manifold. You should also be
> using the correct sealant.
>
> Thermostat gasket:
>
> <
> https://www.autozone.com/gaskets/performance-thermostat-gasket/mr-gasket-performance-thermostat-gasket/153321_957471_0
>>
>
> Correct sealant, must be compatible with glycol type coolants, the red,
> blue and black silicone sealants are not the best for this application:
>
> <
> https://www.autozone.com/sealants-glues-adhesives-and-tape/gasket-sealant/j-b-weld-water-pump-and-thermostat-housing-gasket-maker-and-sealant/848004_0_0
>>
> or
> <
> https://www.autozone.com/sealants-glues-adhesives-and-tape/gasket-sealant/permatex-water-pump-and-thermostat-rtv-silicone-gasket/516195_0_0
>>
>
> J.R. Wright
> GMC Great Laker
> GMC Great Laker Tech Editor
> GMC Eastern States
> GMCMHI
> TZE Zone Restorations
> 78 Buskirk Custom 30' Stretch
> 75 Avion (Under going Frame up Restoration)
>
>
> On Sat, Mar 31, 2018 at 11:06 AM, Jim Kanomata

>
>> Look under Engine section .
>>
>>

>>
>>> can anyone tell me if there is some place that lists all the torque
>>> settings for the gmc , I have all manuals but can't find any spec on
>>> thermostat
>>> housing if there is one .
>>> thanks
>>> Joe
>>> --
>>> Joe Williams
>>> 1978 Royale rear twin
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Newark,CA
>> jimk
>> http://www.appliedgmc.com
>> 1-800-752-7502
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Joe,

Google "Torque Tables" and download one that you like and refer to it whenever the maintenance manual doesn't provide a torque spec
for the bolt / nut you are tightening.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Joe williams
Sent: Saturday, March 31, 2018 5:06 PM
To: gmclist
Subject: Re: [GMCnet] torque settings

thanks all , I went with 20lb , up and running no leaks .
--
Joe Williams
1978 Royale rear twin
 
Too late now, Joe, you have it together and probably weren't using an
aluminum manifold anyway.

But pursuant to John's comments, for the aluminum manifold, one thing to
remember is that the holes are not drilled through as they are on the iron
manifold. Getting a bolt exactly the right length not to either bottom out
or engage too few threads is a struggle. For this reason, I used studs,
screwed tight against the bottom of the hole, with nuts to hold down the
thermostat housing.

Rick "for posterity" Denney

> Joe,
> The torque requirements are scattered thru out the manuals either in the
> section that you are using or at the end of most sections. If you go to
> X7725 Section 6a page 68+ you can find most of the engine torque
> specification. The thermostat housing is apparently not listed. It is
> 5/16 bolt and I would suggest no more than 12 to 15 FT/LBS as you can strip
> out the treads out if you have an aluminum manifold. You should also be
> using the correct sealant.
 
You must log in or register to reply here.
Get your shine on at www.cruzingear.co
GMCMI Spring 2026 Rally

Share this page

Share this page
Top Bottom
Back