| What is the Thermostat housing Bolt size??? [message #250070] |
Sun, 18 May 2014 18:44  |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Senior Member |
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Still trying to get my 73 back on the road . Another novice thing holding me up - what is the proper size bolt to hold the thermostat housing (outlet-engine water) down to the intake manifold?
The parts book shows item #9 on page 8-8: SCREW,CAP,HEXAGON HEAD Part No. 9418918 but that does not help me much at the hardware store. I don't seem to have any bolts around here that fit to check the size with.
Thanks
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: [GMCnet] What is the Thermostat housing Bolt size??? [message #250081 is a reply to message #250077] |
Sun, 18 May 2014 20:28  |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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My guess is a 5/16"-18.
When I swapped motors a week ago I used a 1/2" socket to remove and tighten
down the bolts! JWID
If you use stainless bolts be sure to coat them with Never-seez.
On Sun, May 18, 2014 at 6:52 PM, Billy Massey wrote:
> My guess? 3/8" - 16 x 1"
> On May 18, 2014 6:53 PM, "Robert Mueller" wrote:
>
>> George,
>>
>> Try a 1/4" x 20 National Coarse.
>>
>> As far as length goes I can't remember if the threaded holes in the
>> manifold extend into the water jacket or not. If they do not go
>> into the water jacket measure the depth of each hole with a tooth pick
> and
>> add the thickness of the thermostat housing and buy a
>> stainless steel bolt that is a bit shorter then use a flat and lock
>> washer. If the holes do extend into the water jacket do the same
>> thing making sure the bolts are not long enough to extend into the water
>> jacket.
>>
>> My guess is that he bolts are 1/4" x 20 x 3/4"
>>
>> Regards,
>> Rob M.
>>
>> -----Original Message-----
>> From: GEORGE BUTTS
>>
>> Still trying to get my 73 back on the road. Another novice thing holding
>> me up - what is the proper size bolt to hold the
>> thermostat housing (outlet-engine water) down to the intake manifold?
>> The parts book shows item #9 on page 8-8: SCREW,CAP,HEXAGON HEAD Part
> No.
>> 9418918 but that does not help me much at the hardware
>> store. I don't seem to have any bolts around here that fit to check the
>> size with.
>> Thanks
>> --
>> George
>>
>> _______________________________________________
>> GMCnet mailing list
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>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] What is the Thermostat housing Bolt size??? [message #250082 is a reply to message #250081] |
Sun, 18 May 2014 20:32 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I'm with Bruce. Too important a connection for 1/4" & doesn't require the
strength for 3/8". 5/16" should be just about right.
Why don't you just buy 2 each of all 3? The start of your essential "junk
box". You'll save the cost in gas avoiding the next trip to the hardware.
:=)
Ken H.
On Sun, May 18, 2014 at 9:28 PM, Bruce Hart wrote:
> My guess is a 5/16"-18.
> When I swapped motors a week ago I used a 1/2" socket to remove and tighten
> down the bolts! JWID
>
> If you use stainless bolts be sure to coat them with Never-seez.
>
>
> On Sun, May 18, 2014 at 6:52 PM, Billy Massey wrote:
>
>> My guess? 3/8" - 16 x 1"
>> On May 18, 2014 6:53 PM, "Robert Mueller"
> wrote:
>>
>>> George,
>>>
>>> Try a 1/4" x 20 National Coarse.
>>>
>>> As far as length goes I can't remember if the threaded holes in the
>>> manifold extend into the water jacket or not. If they do not go
>>> into the water jacket measure the depth of each hole with a tooth pick
>> and
>>> add the thickness of the thermostat housing and buy a
>>> stainless steel bolt that is a bit shorter then use a flat and lock
>>> washer. If the holes do extend into the water jacket do the same
>>> thing making sure the bolts are not long enough to extend into the
> water
>>> jacket.
>>>
>>> My guess is that he bolts are 1/4" x 20 x 3/4"
>>>
>>> Regards,
>>> Rob M.
>>>
>>> -----Original Message-----
>>> From: GEORGE BUTTS
>>>
>>> Still trying to get my 73 back on the road. Another novice thing
> holding
>>> me up - what is the proper size bolt to hold the
>>> thermostat housing (outlet-engine water) down to the intake manifold?
>>> The parts book shows item #9 on page 8-8: SCREW,CAP,HEXAGON HEAD Part
>> No.
>>> 9418918 but that does not help me much at the hardware
>>> store. I don't seem to have any bolts around here that fit to check
> the
>>> size with.
>>> Thanks
>>> --
>>> George
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] What is the Thermostat housing Bolt size??? [message #250085 is a reply to message #250077] |
Sun, 18 May 2014 21:29 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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My guess is 5/16"x18. I am pretty sure those holes go all the way through and into the water jacket of the intake manifold. When you install them put some sealant like Permatex on the threads to keep them from leaking coolant up the threads.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: What is the Thermostat housing Bolt size??? [message #250090 is a reply to message #250070] |
Sun, 18 May 2014 22:01 |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Senior Member |
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I am pretty sure it takes a 5/16. Only place open today is Home Depot and only had a 5/16 18 and a 5/16 24. The 18 will go in about a turn and the 24 none at all. So as was mentioned above, I will try and find a 5/16 20 tomorrow.
I have another coach here that I guess I could remove one of the bolts to size it but I am so paranoid with these bolts I am hesitant to put a wench to anything now days. My problems started when one sheared off on the 73 while replacing the thermostat almost a year ago. Had to get another manifold etc and finally now getting around to putting it back together. It looked like the PO had replaced one of the bolts with a standard one instead of a grade 5 like I see on the other coach. Also it was longer and protruded into the water and was well corroded. Well that's the one that sheared off. I had the other correct bolt (1 & 1/4 inch)and got new SS ones but in the mean time misplaced them all. (a sign of old age---me not the bolt) So here I am still messing with the thing!
By the way, what is the equivalent grade 5 bolt in stainless steel?
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: What is the Thermostat housing Bolt size??? [message #250092 is a reply to message #250090] |
Sun, 18 May 2014 22:09 |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
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Senior Member |
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I wouldn't recommend stainless. No point mixing metals where you don't need to. I would try removing one from the other coach. It might come out easily, and if it does, you're all set. If it doesn't come out easily, no harm done.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
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| Re: [GMCnet] What is the Thermostat housing Bolt size??? [message #250093 is a reply to message #250082] |
Sun, 18 May 2014 22:10 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Agreed!
A 1/2 socket means the bolt is 5/16" diameter. National fine (24 TPI) would not be necessary so my "Final Answer" is 5/16 x 18 - 3/4
or 1".
Hey, I just found it here: http://www.gmpartswiki.com/getpage?pageid=19556
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ken Henderson
Sent: Monday, May 19, 2014 11:33 AM
To: gmclist
Subject: Re: [GMCnet] What is the Thermostat housing Bolt size???
I'm with Bruce. Too important a connection for 1/4" & doesn't require the
strength for 3/8". 5/16" should be just about right.
Why don't you just buy 2 each of all 3? The start of your essential "junk
box". You'll save the cost in gas avoiding the next trip to the hardware.
:=)
Ken H.
On Sun, May 18, 2014 at 9:28 PM, Bruce Hart wrote:
> My guess is a 5/16"-18.
> When I swapped motors a week ago I used a 1/2" socket to remove and tighten
> down the bolts! JWID
>
> If you use stainless bolts be sure to coat them with Never-seez.
>
>
> On Sun, May 18, 2014 at 6:52 PM, Billy Massey wrote:
>
>> My guess? 3/8" - 16 x 1"
>> On May 18, 2014 6:53 PM, "Robert Mueller"
> wrote:
>>
>>> George,
>>>
>>> Try a 1/4" x 20 National Coarse.
>>>
>>> As far as length goes I can't remember if the threaded holes in the
>>> manifold extend into the water jacket or not. If they do not go
>>> into the water jacket measure the depth of each hole with a tooth pick
>> and
>>> add the thickness of the thermostat housing and buy a
>>> stainless steel bolt that is a bit shorter then use a flat and lock
>>> washer. If the holes do extend into the water jacket do the same
>>> thing making sure the bolts are not long enough to extend into the
> water
>>> jacket.
>>>
>>> My guess is that he bolts are 1/4" x 20 x 3/4"
>>>
>>> Regards,
>>> Rob M.
>>>
>>> -----Original Message-----
>>> From: GEORGE BUTTS
>>>
>>> Still trying to get my 73 back on the road. Another novice thing
> holding
>>> me up - what is the proper size bolt to hold the
>>> thermostat housing (outlet-engine water) down to the intake manifold?
>>> The parts book shows item #9 on page 8-8: SCREW,CAP,HEXAGON HEAD Part
>> No.
>>> 9418918 but that does not help me much at the hardware
>>> store. I don't seem to have any bolts around here that fit to check
> the
>>> size with.
>>> Thanks
>>> --
>>> George
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: What is the Thermostat housing Bolt size??? [message #250100 is a reply to message #250092] |
Mon, 19 May 2014 01:29 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Otterwan wrote on Sun, 18 May 2014 22:09I wouldn't recommend stainless. No point mixing metals where you don't need to. I would try removing one from the other coach. It might come out easily, and if it does, you're all set. If it doesn't come out easily, no harm done.
There is no such thing as 5/16"x20. It is 5/16x18. If it is that hard to turn with a wrench then gently chase the threads with a 5/15x18 tap.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: What is the Thermostat housing Bolt size??? [message #250164 is a reply to message #250106] |
Mon, 19 May 2014 22:40 |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Senior Member |
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Thanks guys for the information. Will get a tap to clean it up and the proper bolt and maybe some day I get to hear this gal run again. Love the sound of its SpinTech Muffler
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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