[GMCnet] Rear panel screws

[Hal StClair]

Just wondering what people are using to replace missing rear panel screws. My 1977 is missing a few and a couple appear to be stripped. Anyone tried
using a nut insert or would something like that hold? Any suggestions certainly appreciated. Hal
--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1975 Eleganza II, 101230,

1974 Eagle Bus 45',w/slideout,

Rio Rancho, NM

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[Bob Dunahugh]

I have some of the crews at home. I want a lot for them. FREE. Be back home next week. Out with the GMC now. So that we can compile another list of things that I have to do to it. RIGHT? To repair the hole. How about filling the hole with something like JB weld. Let it harden. Then drill a fresh hole that's a little under size. So the screw can cut new threads. I've used an extra screw to make into a tap of sort. Not much load on this screws. Bob Dunahugh Highly modified 78 Royale

[Jim Kanomata]

Get hold of Jim Bounds at Coop.
Make it brief and ask him, he will tell you how to do it.

--
Jim Kanomata
Applied/GMC, Newark,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502

[Dennis Sexton]

Hal StClair wrote on Sat, 01 September 2018 00:50

> Just wondering what people are using to replace missing rear panel screws. My 1977 is missing a few and a couple appear to be stripped. Anyone
> tried using a nut insert or would something like that hold? Any suggestions certainly appreciated. Hal

Hal
Here's a link to Dan Winchester's page on the rear hatch screws.

http://www.dwinchester.com/GMC/GMC_230_Back_Hatch/GMC_230_Back_Hatch_Screw_Replacement.html

Hope this helps.

Dennis

--
Dennis S
73 Painted Desert 230
Memphis TN Metro

[Gerald Work via Gmclist]

Hi Hal,

Those are special dual thread screws made for fiberglass. McMaster Carr has them in stainless along with some of the better old line hardware stores. Jim B has/had them as well. I don’t know about Jim K.

Jerry Work
Kerby, OR

[Jim Kanomata]

WE have most eveything, but need to ask our guys as to what we do when the
origional threads are shot.
Nick, just reminded me that we put in an insert to repair the stripped and
then use the reguler screws.
Oh, we do have them.

--
Jim Kanomata
Applied/GMC, Newark,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502

[Jim Kanomata]

My attitude about what we charge for parts is that ;
If you have time to figur parts out and put together the hdw. then do it
your self, but if you want to aquire it from us and save time and
frustration, then get it from us and please don't second guess the price
and write that were charging too much. Non of the GMC shops are getting
welthy from the community. Bounds at Coop can't care if he sells a part as
he is in the business of redoing vehicles.
I our case, if it is not for our Air Filter side, we would need to close
down the parts as it is too labor intensive for what we earn.

--
Jim Kanomata
Applied/GMC, Newark,CA
ji...@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502

[Gerald Work via Gmclist]

I had some off line questions about where to find the special fasteners for the rear panel on our GMCs.

They are called thread forming screws for brittle plastic. Sometimes also called hi-low thread screws. In McMaster Carr they are listed:

https://www.mcmaster.com/#high-low-screws/=1eeyu56

If you look at the OEM fastener for the rear cap you will see that it is a screw with both a high and a low thread and a blunt nose. These are designed to cut threads in the resin binder in fiberglass, SMC, and other brittle plastic materials when the pilot hole is the same size, or ever so slightly larger, as the root diameter of the screw.

The two piece fasteners some suggest for this purpose are generally called threaded inserts. The insert part only has a single height, segmented thread. Those are designed for use in the cross grain of wood where the segmented teeth will cut into the wood fibers and hold fast. They cannot be used in end grain very successfully because they will just tear out the end grain if over stressed. They may work for a while in fiberglass or SMC but over time they most likely will fracture the binders in these brittle materials and you will be right back to redoing them again.

If the holes in the SMC on your GMC body are damaged or enlarged you need to fill and redrill them before inserting the proper hi-low thread screws. You can use different sizes of these special screws anytime you fasten something directly into the SMC skin on the GMC.

Jerry

Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR

glw...@mac.com
http://jerrywork.com

[Hal StClair]

Thank you for the info although I'm a bit confused on which screws to order. The screw I removed measures about 7/16"in dia and about 1" long which
seems to be quite a bit larger than the ones MC sells-or am I looking at the listing wrong? Thanks for any clarification. BTW, my GMC is a 1977
vintage. Hal

--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1975 Eleganza II, 101230,

1974 Eagle Bus 45',w/slideout,

Rio Rancho, NM

[Charles Boyd]

Hi Hal, there is a product that is an epoxy thread repair that you mix up and put in the hole then it has a release agent you put on the OEM screw
and install it snug. When it sets up you can torque it to spec. Seems it was just called thread repair?





Hal StClair wrote on Sat, 01 September 2018 21:44

> Thank you for the info although I'm a bit confused on which screws to order. The screw I removed measures about 7/16"in dia and about 1" long
> which seems to be quite a bit larger than the ones MC sells-or am I looking at the listing wrong? Thanks for any clarification. BTW, my GMC is a
> 1977 vintage. Hal


--

C. Boyd
76 Crestmont
East Tennessee

[Dennis Sexton]

Hal & Chuck

One thread repair product is "Form A Thread" by Loctite.

Dennis

C Boyd wrote on Sat, 01 September 2018 21:16

> Hi Hal, there is a product that is an epoxy thread repair that you mix up and put in the hole then it has a release agent you put on the OEM
> screw and install it snug. When it sets up you can torque it to spec. Seems it was just called thread repair?
>
>
>
>
>
> Hal StClair wrote on Sat, 01 September 2018 21:44
> > Thank you for the info although I'm a bit confused on which screws to order. The screw I removed measures about 7/16"in dia and about 1" long
> > which seems to be quite a bit larger than the ones MC sells-or am I looking at the listing wrong? Thanks for any clarification. BTW, my GMC is a
> > 1977 vintage. Hal


--

Dennis S
73 Painted Desert 230
Memphis TN Metro

[Les Burt]

Jerry,

Thanks for bringing those off line (back channel) questions back on line. I have never understood the logic behind people seeking info “off line” when a discussion on the subject is occurring on line. If those people need to ask their question, there is a good chance others might benefit from the answer. I doubt anyone would complain about the additional traffic it might create as we are all here to learn, help, and share.

When an answer is provided off line, it serves to help that single person at that instant. That info never enters the data base we call the gmcnet archives, and it often becomes lost and forgotten. If shared online, it remains available through a search for as long as the gmcnet archives remain alive.

Please don’t take my rant as a complaint. I’m just trying to point out how we all can help improve the function and value of GMCnet.

Les Burt
Montreal
'75 Eleganza 26'

[Johnny Bridges via Gmclist]

I looked at a coach for sale Friday which was missing some screws and had some large hex cap screws in place of many others. Seller said they were
HeliCoiled <tm>.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased