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Heavy front vibration problem - Torsion Bars
http://policeinterceptor.com/revconforums/viewtopic.php?f=14&t=207
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Author:  Austro-Revconeer [ Fri Apr 22, 2022 5:17 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

I have ordered 2 good used torsion bars and the parts as mentioned above from Applied GMC. It took 4 weeks (via UPS) to get them. 300 Euro (USD 324,--) import duty - for 43 year old metal parts! European customs system, no comment.

Meanwhile we tried to get the Revcon into the garage near to the assembly pit at my mechanic' s repair shop in Saxony.

First we had to remove the box on the roof.

Attachment:
Storage Box on the roof R. Forum.jpg
Storage Box on the roof R. Forum.jpg [ 107.57 KiB | Viewed 3627 times ]


The Revcon hangs obviously low on the driver' s side where the nut block or adjusting bolt is broken.

Attachment:
Revcon in garage R. Forum.jpg
Revcon in garage R. Forum.jpg [ 89.97 KiB | Viewed 3627 times ]


The assembly pit is at the entrance door of the paint booth. Tight, but we should be able to work on the torsion bars.

Attachments:
My Revcon inside R. Forum.jpg
My Revcon inside R. Forum.jpg [ 50.53 KiB | Viewed 3627 times ]

Author:  Austro-Revconeer [ Fri Apr 22, 2022 5:23 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

View from below.

Attachment:
Torsion Bar Driver´s Side R. Forum.jpg
Torsion Bar Driver´s Side R. Forum.jpg [ 56.79 KiB | Viewed 3627 times ]


Attachment:
Torsion Bar Passenger Side R. Forum.jpg
Torsion Bar Passenger Side R. Forum.jpg [ 52.06 KiB | Viewed 3627 times ]


Broken special nut block or torsion bar adjusting bolt.

Attachment:
Broken Adjusting Bolt or Special Nut Block Driver´s Side R. Forum.jpg
Broken Adjusting Bolt or Special Nut Block Driver´s Side R. Forum.jpg [ 41.01 KiB | Viewed 3627 times ]

Author:  Austro-Revconeer [ Fri Apr 22, 2022 5:29 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

The new (used) parts, which I ordered from Applied GMC on March 1st, 2022.

Attachment:
Torsion Bars Unloader Tool R. Forum.jpg
Torsion Bars Unloader Tool R. Forum.jpg [ 122.92 KiB | Viewed 3627 times ]


Attachment:
Good used Torsion Bars from Applied GMC 1 R. Forum .jpg
Good used Torsion Bars from Applied GMC 1 R. Forum .jpg [ 114.62 KiB | Viewed 3627 times ]


Attachment:
Good used Torsion Bars from Applied GMC 2 R. Forum .jpg
Good used Torsion Bars from Applied GMC 2 R. Forum .jpg [ 110.62 KiB | Viewed 3627 times ]

Author:  Austro-Revconeer [ Fri Apr 22, 2022 5:39 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

Nick from Applied GMC recommended these special "Pork Chops".

Attachment:
Manual Suspension Maxx Pork Chops R. Forum.jpg
Manual Suspension Maxx Pork Chops R. Forum.jpg [ 138.59 KiB | Viewed 3627 times ]


Very interesting information.

Attachment:
Info Suspension Maxx 2.jpg
Info Suspension Maxx 2.jpg [ 41.23 KiB | Viewed 3627 times ]


Attachment:
Info Suspension Maxx 3.jpg
Info Suspension Maxx 3.jpg [ 222.78 KiB | Viewed 3627 times ]


Now let´s see if the ordered parts from the GMC Motorhome fit for my Revcon and if they can be changed without any problems... :?

Author:  Austro-Revconeer [ Sat Apr 23, 2022 7:50 am ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

I presume that pork chop A is for the driver' s side and B for the passenger side.

But what is the correct setting?

Always A and B, e.g. A4 + B4? A5 + B5?

Are the outer positions 1 to 3 the steps to lower the height and 4 to 6 to raise it?

What is the standard setting? A3 + B3?

Don' t know yet.

Author:  Daveinet [ Sat Apr 23, 2022 7:46 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

Well that is kind of nice. You can just clock those pork chops to any position you want to. I never had a ride height issue, but nice to know there would be a solution. I don't know what the spec is for ride height, but I would presume at minimum, your best bet would be to make the half shafts level when the coach is fully loaded. I arbitrarily had mine set slightly above spec to help prevent the coach from bottoming out. While our coaches are similar, the specs are different between your slantmobile and my slant nose.

Author:  Austro-Revconeer [ Sun Apr 24, 2022 6:05 am ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

"Slantmobile" - because my Revcon has got an Oldsmobile engine? :lol:

I have asked Nick about the settings, let' s see what he writes back. ;)

Why are the specs different? Because of the smaller Olds engine - less front weight?

Author:  Austro-Revconeer [ Fri Apr 29, 2022 4:06 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

OK, I talked to Nick from Applied GMC today. I have just called him, that´s the best and fastest way to get the right information:

Always set A and B with the same number.
1 to 3 to lower the height and 4 to 6 to raise it.
It is a good idea to start with A3 and B3.

Position of the torsion bar unloader tool:

Attachment:
Position Unloader Tool R. Forum.jpg
Position Unloader Tool R. Forum.jpg [ 136.08 KiB | Viewed 3571 times ]

Author:  Austro-Revconeer [ Fri Apr 29, 2022 4:08 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

1976 GMC Motorhome Maintenance Manual Supplement concerning torsion bars (first link):

https://www.google.com/search?q=torsion ... s-wiz-serp

Refer to 3A-18 Front Suspension (Removal/Installation).

Found the PDF one day during a 5 minute break at work. The whole manual might be helpful. 139 pages.

Author:  Austro-Revconeer [ Fri Apr 29, 2022 4:09 pm ]
Post subject:  Re: Heavy front vibration problem - Torsion Bars

Some videos which may also help:

From 0:30. Suspension Maxx Leveling Kit

https://youtu.be/1mbuGxsvGxw

Best Torsion Key Lift Ever

https://youtu.be/_oLdysHsPhg

GMC Motorhome from 8:00. Installing the Torsion Bars/Special Nut Blocks

https://youtu.be/3APA3D53CaE

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