GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

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1 Forum: GMCnet «» Posted on: Wed, 13 January 2021 17:55 «» By: Ken M
Machining Brake Drums
…I'm working on my brakes - new shoes, springs, cylinders, replacing rubber lines, etc. One of my drums has some pretty good scoring grooves in it. No telling how that happened. Does anyone have the specs for how much a factory drum can be turned in …
2 Forum: GMCnet «» Posted on: Tue, 29 December 2020 21:29 «» By: Ray Erspamer
Re: [GMCnet] Battery "Isolator"
…got rid of my Isolator 10 years ago and just use a Yardina Combiner.  It works great.Sent from my U.S.Cellular© Smartphone -------- Original message --------From: "John R. Lebetski via Gmclist" Date: 12/29/20 9:25 PM (GMT-06:00) To: gmclist…
3 Forum: GMCnet «» Posted on: Sun, 27 December 2020 17:07 «» By: James Hupy
Re: [GMCnet] OUCH Bad Oil Analysis
…you have a bronze distributor gear, get rid of it. Particularly if you have replaced the original camshaft with a roller setup. Those cam blanks are steel, as are MOST of the distributor gears. The most compatible distributor gear is a mehinite one. Jim …
4 Forum: GMCnet «» Posted on: Sun, 13 December 2020 19:54 «» By: Tilerpep
Re: Aluminum radiator
http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=43326&goto=351901&rid=0#msg_351901 Why do you think you need an upgrade? Mine was leaking, bulging from a PO blown engine overheat and both coolers were compromised
5 Forum: GMCnet «» Posted on: Fri, 11 December 2020 07:32 «» By: LNelson
Cabinet Painting and Generators
…is that for a eclectic topic? Anyway, I am inquiring about getting rid of the 6kw Onan and installing a new 4kw. Anyone do this? can it still slide? Will it fit? And mostly, is it quieter? Next, I saw a Youtube video of a lady who refurbished an …
6 Forum: GMCnet «» Posted on: Wed, 09 December 2020 17:23 «» By: Bruce Hart
Re: [GMCnet] Composite Plastic Airbag Cones
…Ken, I have several that I could send to you. I need to get rid of excess items as I plan on moving in the new year. On Wed, Dec 9, 2020 at 10:49 AM Ken Burton via Gmclist < gmclist@list.gmcnet.org> wrote: > Carl, > > If you want …
7 Forum: GMCnet «» Posted on: Wed, 09 December 2020 11:48 «» By: Ken Burton
Re: [GMCnet] Composite Plastic Airbag Cones
…Carl, If you want to get rid of the aluminum ones, send them to me. I clean them up, bead blast them, polish up the areas where they touch the bags and paint them Rustolem black. Then about once a year I get request for one or two and I mail them …
8 Forum: GMCnet «» Posted on: Mon, 07 December 2020 11:23 «» By: James Hupy
Re: [GMCnet] Oil ZDDP Rotella gas truck
…good clean oil, changed frequently enough to rid your engine of combustion by-products is good. On a well broken in engine. New rebuilds? Jury is out. Jim Hupy Salem, Oregon On Mon, Dec 7, 2020, 9:15 AM John R. Lebetski via Gmclist < gmclist@list.…
9 Forum: GMCnet «» Posted on: Mon, 07 December 2020 05:25 «» By: Ken Burton
Re: Oil ZDDP Rotella gas truck
…coach, as far as I can tell, the previous own only used Rotella dino 15 W 40 It now has 135 K miles on it. and the oil consumption has fallen form 6000 per quart to 5000 per quart. Since I already used Rotella in my diesel John Deer and all of my air …
10 Forum: GMCnet «» Posted on: Fri, 04 December 2020 18:25 «» By: Paul Nadel
Re: [GMCnet] Is 142 MPH possible?
…Salt Flats is over 4000ft. elevation. The 26 ft GMC has less wind resistance than the 23 footer. How about an American made Allison V-12? Get rid of all the unnecessary weight. Reshape the nose. Lower it down about 3 inches. 2.73 gears. Replace …
11 Forum: GMCnet «» Posted on: Thu, 03 December 2020 20:41 «» By: Larry
Re: 455 Expected Engine Life
Interested in oil for our engines? FWIW, check this: http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=355649&rid=19&srch=engine+oils#msg_355649
12 Forum: GMCnet «» Posted on: Mon, 30 November 2020 12:53 «» By: rjw
Re: pop up adds
… I recently started to see those ads as well. I activated uBlock Origin in my normally used browser (Firefox) for this site and they no longer appear. Just another option to get rid of ads. Now if the ads help support this site, I would be willing to …
13 Forum: GMCnet «» Posted on: Wed, 21 October 2020 16:01 «» By: mghamms
Re: [GMCnet] ALL ELECTRIC GMC MOTORHOME
…thinking is a hybrid would be best for a motorhome with todays technology. Get rid of the generator and propane and use all electric. A gas, or diesel, engine with enough power to move the rv at highway speeds and charge the batteries and run a heat…
14 Forum: GMCnet «» Posted on: Thu, 15 October 2020 11:18 «» By: Russell K.
Re: [GMCnet] Onan 4000 sparkplugs
…Dean, It was recommended to me to stay away from Champion spark plugs for the Onan. I use NGK plugs now. I think it runs better. Maybe it likes the hotter plugs, it runs great. Here is the link to the thread from last summer. http://gmc.mybirdfeeder.…
15 Forum: GMCnet «» Posted on: Fri, 25 September 2020 19:55 «» By: Matt Colie
Re: [GMCnet] Battery charging
… Vadim, There are some know difficulties in charging the house bank aboard a TZE. It is also well know to engine guys (like me) that nothing good happens in an idling engine. Given the build year of your coach, it most likely has an 80 amp …
16 Forum: GMCnet «» Posted on: Sat, 19 September 2020 13:13 «» By: Bill Van Vlack
Re: Have you run an extra evaporator?
Hal, More info on Project Icebox Bill http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=314810&rid=4947&srch=icebox#msg_314810
17 Forum: GMCnet «» Posted on: Fri, 18 September 2020 19:49 «» By: lotsofspareparts
Re: Anybody local (Western Washington) have a pressure bleeder I can borrow for a day?
…I've got a bleeder I am picking up tomorrow morning and the truck is loaded and I am ready to go!! I will post an update tomorrow night on my progress in this thread http://www.gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&th=44092&start=0&…
18 Forum: GMCnet «» Posted on: Fri, 18 September 2020 07:35 «» By: Jim Miller
Re: Who loves and understands their Original Onan ?
… Yes, count me as a fan of the Onan. I have them in my two coaches and love them. Add to that the many Onans that I have repaired at GMC work rallies at my family's compound. Unless they have a rod hanging out the side (which I have never seen) then I …
19 Forum: GMCnet «» Posted on: Thu, 17 September 2020 21:08 «» By: James Hupy
Re: [GMCnet] Who loves and understands their Original Onan ?
…6K Onan has sat since early March without running. I went into the coach yesterday for an all systems check, and hit the start button on the ONAN. 3ea 10 second bursts on the starter, and she fired up and settled right down to her governed speed. 15 …
20 Forum: GMCnet «» Posted on: Thu, 17 September 2020 20:49 «» By: James Hupy
Re: [GMCnet] Who loves and understands their Original Onan ?
…maintained, they will outlast their owners and their coaches. I would not get rid of one that was working well. Cast iron is good. Aluminum/zinc alloys, start turning back into the ores they were created from as soon as they are cast. Corrosion is a 4 …
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