| Missing bolt [message #88853] |
Wed, 16 June 2010 14:50  |
spiffycar
Messages: 133
Registered: May 2010
Location: Brook Park ,Ohio
Karma: 1
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After reading through the threads on ride height adjustments I went out poking around under my coach to check some things out. While under there I found one of my adjusting bolts for the pork chops is missing.Is this something I could get off another vehicle at a bone yard or are they (thread pitch) specific to the motor home?
Paul W L
76 Daytona Beach! ( EX-Palm Beach )
Cleveland,OH
& Current Card Carrying Pull A Part VIP Member
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| Re: Missing bolt [message #88854 is a reply to message #88853] |
Wed, 16 June 2010 14:58  |
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Hi Paul, you could probably find one on the 70's GM products; I've found both fine and course threads and I like the fine threads. Jim K. has them in stock.
geo groth '73 260 Sequoia
Carson City Nevada 89703
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| Re: [GMCnet] Missing bolt [message #88861 is a reply to message #88858] |
Wed, 16 June 2010 15:24 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| emerystora wrote on Wed, 16 June 2010 15:05 |
This is a common bolt that you can probably find at any good hardware store. However, some bolts of that size don't have the threads cut far enough so you might be better off just ordering one from Jim Kanomata.
Emery Stora
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I have mine out right now and IIRC the head of the bolt has LOTS of hash marks on it, indicating to me it may be a high grade bolt. I would be looking for confirmation on that before I bought any thing from the hardware store. Both my 74 and 75 are fine thread.
Here is a picture I took for my reference:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=33698&title=front-suspension-rebui&cat=5459
Too bad I don't have a picture of the head markings, yet.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Missing bolt [message #88890 is a reply to message #88888] |
Wed, 16 June 2010 17:52 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Yes, there is a chance that the bolt broke when someone tried to adjust the
front ride height without using a torsion bar unloader tool. There is one
heck of a lot of tension on these bars. The good part is that even if the
bolt is sheared off, you can remove the captive nut in the crossmember,
extract the broken piece or replace the captive nut assy. It is pictured
quite clearly in the GMC manual. Check the pork chop carefully for adverse
wear from being run with no bolt. They are also available. Hope this helps.
Jim Hupy
Salem, OR
1978 Royale 403
On Wed, Jun 16, 2010 at 3:44 PM, Larry Davick <ljdavick@comcast.net> wrote:
> Is there any chance that this bolt has sheared off and not simply fallen
> out? Is it under a great deal of tension?
>
> Larry Davick
> The Mystery Machine
>
> ----- Original Message -----
> From: "Emery Stora" <emerystora@mac.com>
> To: gmclist@temp.gmcnet.org
> Sent: Wednesday, June 16, 2010 2:55:45 PM GMT -08:00 US/Canada Pacific
> Subject: Re: [GMCnet] Missing bolt
>
> I am pretty sure that it is a high grade bolt -- probably Grade 8. A good
> hardware store will stock them. Just look at the other bolt and get the same
> head markings.
>
> Emery
>
> On Jun 16, 2010, at 2:24 PM, Steve Southworth wrote:
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: Missing bolt [message #88905 is a reply to message #88853] |
Wed, 16 June 2010 18:46 |
kingd
Messages: 592
Registered: June 2004
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The "grade" of the bolt is 2 more than the number of radius marks on the bolt head, as has been said, 6 marks is grade 8. (0 marks is "butter", don't even make good tent pegs !!!!)
I've seen 12 marks(grade 14)
DAVE KING
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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| Re: Missing bolt [message #88934 is a reply to message #88853] |
Thu, 17 June 2010 01:51 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| spiffycar wrote on Wed, 16 June 2010 14:50 |
After reading through the threads on ride height adjustments I went out poking around under my coach to check some things out. While under there I found one of my adjusting bolts for the pork chops is missing.Is this something I could get off another vehicle at a bone yard or are they (thread pitch) specific to the motor home?
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How the heck can the bolt be missing? The coach would be on the ground without it.
Are you also missing the part that the bolt screws in to? With out a bolt the flat plate it screws in to would just flop around and fall out.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Missing bolt [message #88936 is a reply to message #88934] |
Thu, 17 June 2010 02:38 |
spiffycar
Messages: 133
Registered: May 2010
Location: Brook Park ,Ohio
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How the heck can the bolt be missing? The coach would be on the ground without it.
Are you also missing the part that the bolt screws in to? With out a bolt the flat plate it screws in to would just flop around and fall out.
The bolt is gone. The pork chop is currently resting on the flat plate nut that the bolt is supposed to screw into. I just replaced the tires a couple weeks ago. The ones that were on it (235/85/16) had a much larger dia. than what is on there now (225/75/16). I suspect that the previous owner may have backed the bolts all the way down to get the correct ride height and it must have fallen out at some point. There is no kind of lock nut on the other bolt either. Might be a good idea to add some when I replace the bolts so this doesn't happen again. Glad I found this before I started using the coach!
Paul W L
76 Daytona Beach! ( EX-Palm Beach )
Cleveland,OH
& Current Card Carrying Pull A Part VIP Member
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| Re: [GMCnet] Missing bolt [message #88939 is a reply to message #88936] |
Thu, 17 June 2010 06:08 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Paul,
Don't bother with lock nuts; they'll just be an unneeded hassle and might
interfere with adjustment. When the rounded end of the bolt is seated in
the socket of the pork chop there's too much surface area engaged for the
bolt to back out spontaneously.
I don't think it's very unusual for the bolt to be backed out far enough for
the pork chop to rest on the nut plate; I've seen it several times at Bean
Station and even on one of my coaches.
You're probably right about the PO and the large OD tires; he may have even
left the bolt out after it became disengaged from the PC..
Ken H.
Americus, GA
'76 X-Birchaven
www.gmcwipersetc.com
On Thu, Jun 17, 2010 at 3:38 AM, Paul W Lehmann <spiffycar@gmail.com> wrote:
> ...
> The bolt is gone. The pork chop is currently resting on the flat plate nut
> that the bolt is supposed to screw into. I just replaced the tires a couple
> weeks ago. The ones that were on it (235/85/16) had a much larger dia. than
> what is on there now (225/75/16). I suspect that the previous owner may have
> backed the bolts all the way down to get the correct ride height and it must
> have fallen out at some point. There is no kind of lock nut on the other
> bolt either. Might be a good idea to add some when I replace the bolts so
> this doesn't happen again. Glad I found this before I started using the
> coach!
> --
>
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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: Missing bolt [message #89028 is a reply to message #88905] |
Thu, 17 June 2010 15:53 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| kingd wrote on Wed, 16 June 2010 18:46 |
The "grade" of the bolt is 2 more than the number of radius marks on the bolt head, as has been said, 6 marks is grade 8. (0 marks is "butter", don't even make good tent pegs !!!!)
I've seen 12 marks(grade 14)
DAVE KING
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I checked the 3 pork chop bolts I had easily available. They have 6 hash marks, and thus are grade 8. I don't believe a hardware store bolt is the best as it will not have the rounded end that fits in the pork chop.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Missing bolt [message #89033 is a reply to message #89028] |
Thu, 17 June 2010 16:28 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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But a grinding wheel will fix that close 'nuff in just a couple of
minutes. :-)
Sometimes that's necessary when a longer-than-OEM bolt is needed to get up
to ride height.
Ken H.
On Thu, Jun 17, 2010 at 4:53 PM, Steve Southworth <midlf@centurytel.net>wrote:
> I don't believe a hardware store bolt is the best as it will not have the
> rounded end that fits in the pork chop.
> --
>
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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: Missing bolt [message #89071 is a reply to message #88853] |
Thu, 17 June 2010 22:53 |
spiffycar
Messages: 133
Registered: May 2010
Location: Brook Park ,Ohio
Karma: 1
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Senior Member |
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Thanks to everyone for all the input.
Took the remaining bolt out and found it to be a 1/2 by 20, grade 8. Picked up a couple at Tractor Supply (about $3) and ground the ends down to match the original one. The threads were a little short so I threaded them down farther as well. I doubt I will need that much travel though as the ride height seems to be OK even on the lowest range of the adjustment.
Paul W L
76 Daytona Beach! ( EX-Palm Beach )
Cleveland,OH
& Current Card Carrying Pull A Part VIP Member
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