| Re: [GMCnet] support and shocks [message #123508] |
Wed, 27 April 2011 12:21  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The Bilstein shocks have a weaker upper attachment eye than the KYB's do and
I have seen several that were broken here. I have also seen OEM delco shocks
broken the same way. Those air bags are very powerful and are quite capable
of bending 1/2" Thick steel plate. Simple to minimize the problem. Properly
place the bogie hook and hydraulic jack, lift until you see the suspension
start to unload and then deflate the air bag. Really not a good idea to have
your head in the wheel well with 35+ year old airbags when they are inflated
to 100 psi anyway, particularly is they still have plastic cones like the
early coaches had from the factory. Safety first, GMC owners are hard to
come by.<GRIN>
Jim Hupy
Salem, OR
78 GMC Royale 403
On Wed, Apr 27, 2011 at 10:08 AM, <sgltrac@gmail.com> wrote:
> Mines been sitting with blocks under the frame (right side) and blocks
> under the tires left side for a little more than two months in order to
> access the wiring. Hope the shock ok. Gonna check this weekend. Had no idea
> until reading all these posts
>
> Sully
> 77 Royale basket case
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Ken Burton <n9cv@comcast.net>
> Sender: gmclist-bounces@temp.gmcnet.org
> Date: Wed, 27 Apr 2011 11:59:42
> To: <gmclist@temp.gmcnet.org>
> Reply-To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] support and shocks
>
>
>
> CBWoodSR wrote on Wed, 27 April 2011 06:30
> > But if you use the short section of a leaf spring to keep the arm from
> full travel down, this wont happen..you also dont have to raise it as high.
> > (a logical conclusion AFTER raising the one side to change a wheel)
>
>
>
> Not necessarily,
>
> It is not the weight of the tire and arm that caused the problem. It is
> the pressure applied by the inflated air bag. If you use the piece of leaf
> spring you are now applying even more pressure (due to lever action) to the
> bogie mount at the pivot point a few inches from pivot point the bogie.
> That is a good way to bend the bogie arm or break the bogie mount.
>
> COMPLETELY DEFLATE the air bag prior to jacking the coach past the normal
> travel point or lifting the wheels off the ground with the leaf spring piece
> installed.
>
> Side note: I also have the piece of leaf spring but do not bother to use
> it any more. I just rotated the tires prior to going to the GMCMI rally
> without ever getting the coach high enough to get the rear tires off of the
> ground. It turns out with the coach supported in the middle between the
> bogies and the bag completely deflated there is next to no weight on the the
> wheels and they can be removed and installed with the tires still touching
> the ground. You can lift up on the wheel hub if necessary by hand.
>
> One time went out to help a Black Lister with a flat tire on the Indiana
> Toll Road. I asked before I left if he had a jack and hook. He said yes.
> I brought a long bar and the correct socket which he did not have. It
> turned out I should have asked if the jack worked. It didn't.
>
> Not wanting to drive about 40 miles round trip to my coach to get a good
> jack, I took some short 2x4 cutoffs I happened to have out of the bed of my
> truck. I had him air up that bag as far as possible then placed the 2x4's
> under the jacking point of the bogie. We dropped the coach on the 2x4's and
> completely deflated the bag. We removed and installed the spare at that
> height.
>
> Try lifting the wheel hub by hand next time you have a wheel off and no air
> in the bag. It works.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
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