Home » Public Forums » GMCnet » Body mounts (front and rear - the round ones)
| Body mounts [message #306461] |
Sat, 03 September 2016 16:21  |
jimtze
Messages: 92
Registered: June 2011
Location: Victoria, BC
Karma: 1
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I'm in the middle of changing the body pads. Have the forward and rear rectangular pads out and in. Middle ones still to do. I have the round body bushing mounts in place. My concern is that the front mounts may be slightly off to the rear and the new bolts will not line up and go in. Has anyone had a problem with this?
I did discover that you have to watch that the ground wire on the front right side does not slip out from under the spacer block.
Jim Bratvold
Victoria, BC
76 Eleganza ll
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| Re: [GMCnet] Body mounts [message #306476 is a reply to message #306461] |
Sat, 03 September 2016 19:25  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Leave the front and rearmost mounts loose ( midship ones too) until you
have replaced all of the pads/bushings. If you do this you be able to
position all of the mounts with a pry bar while body elevated slightly off
the frame.
Sully
77 eleganza 2
Seattle
On Saturday, September 3, 2016, Jim Bratvold wrote:
> I'm in the middle of changing the body pads. Have the forward and rear
> rectangular pads out and in. Middle ones still to do. I have the round body
> bushing mounts in place. My concern is that the front mounts may be
> slightly off to the rear and the new bolts will not line up and go in. Has
> anyone
> had a problem with this?
>
> I did discover that you have to watch that the ground wire on the front
> right side does not slip out from under the spacer block.
> --
> Jim Bratvold
> Victoria, BC
> 76 Eleganza ll
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Body mounts [message #306550 is a reply to message #306548] |
Mon, 05 September 2016 11:54 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Cut down horse stall mat from Tractor Supply, Northern Tool, and other horse shops. 4' x 6' x 3/4"this week for $36 @ TS. Must be good stuff, it is made in Canada.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Body mounts [message #306551 is a reply to message #306548] |
Mon, 05 September 2016 11:56 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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The density won't matter. It's getting the body away from the vibrations of the frame that does.
Jim B has a spot on (and correct from a physics standpoint) description of why this works.
Dolph Santorine
DE N8JPC
Wheeling, West Virginia
1977 ex-Palm Beach TZE167V100820
1-ton, Sullybuilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010,
> On Sep 5, 2016, at 11:52 AM, Emery Stora wrote:
>
> They probably give great support as they don’t compress but their density would’t give as good dampening of vibrations.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>> On Sep 5, 2016, at 9:38 AM, David H. Jarvis wrote:
>>
>> Hockey pucks sliced in half work good.
>>
>> _______________________________________________
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| Re: [GMCnet] Body mounts [message #306552 is a reply to message #306551] |
Mon, 05 September 2016 12:00 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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On what do you base that statement?
In that case why not use solid blocks of metal?
Emery Stora
77 Kingsley
Frederick, CO
> On Sep 5, 2016, at 10:56 AM, Adolph Santorine wrote:
>
> The density won't matter. It's getting the body away from the vibrations of the frame that does.
>
> Jim B has a spot on (and correct from a physics standpoint) description of why this works.
>
> Dolph Santorine
>
> DE N8JPC
>
> Wheeling, West Virginia
>
> 1977 ex-Palm Beach TZE167V100820
> 1-ton, Sullybuilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010,
>
>
>> On Sep 5, 2016, at 11:52 AM, Emery Stora wrote:
>>
>> They probably give great support as they don’t compress but their density would’t give as good dampening of vibrations.
>>
>> Emery Stora
>> 77 Kingsley
>> Frederick, CO
>>
>>> On Sep 5, 2016, at 9:38 AM, David H. Jarvis wrote:
>>>
>>> Hockey pucks sliced in half work good.
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
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>
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| Re: [GMCnet] Body mounts [message #306554 is a reply to message #306550] |
Mon, 05 September 2016 12:38 |
jimtze
Messages: 92
Registered: June 2011
Location: Victoria, BC
Karma: 1
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Applied GMC have the mounts. I've put them in and can not read the name on them now but it was something like borden controls. They have a bushing runs down the centre and keeps the two aligned. It is a squeeze fit. I used dilute dish soap spray to help get them in place. New G8 bolts, washers and nuts. Almost done, it looks good. Will be delayed until Wednesday to complete. I'm expecting an improvement in the ride and also less road noise transmission. The old ones were compressed to the thickness of a crepe.
Jim Bratvold
Victoria, BC
76 Eleganza ll
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| Re: [GMCnet] Body mounts [message #306558 is a reply to message #306552] |
Mon, 05 September 2016 13:56 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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You could use solid blocks just fine, and likely not notice a difference.
Passive Vibration Isolation = Damping Element + Spring Element + Mass
The spring and the mass are givens. You’re not going to get enough damping to get anything done in the space allotted, so the best isolation is getting the coach off the frame, and letting it’s spring handle the vibration on it’s own.
Far enough apart so when the coach flexes, it does not rub the frame.
It’s why GM moved from the more pliable strips running along the length of the frame (first generation coaches) to the rubber pads (that are not a lot more pliable than hockey pucks, even when new).
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26’ ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
“The Aluminum and Fiberglass Mistress"
> On Sep 5, 2016, at 1:00 PM, Emery Stora wrote:
>
> On what do you base that statement?
> In that case why not use solid blocks of metal?
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>> On Sep 5, 2016, at 10:56 AM, Adolph Santorine wrote:
>>
>> The density won't matter. It's getting the body away from the vibrations of the frame that does.
>>
>> Jim B has a spot on (and correct from a physics standpoint) description of why this works.
>>
>> Dolph Santorine
>>
>> DE N8JPC
>>
>> Wheeling, West Virginia
>>
>> 1977 ex-Palm Beach TZE167V100820
>> 1-ton, Sullybuilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010,
>>
>>
>>> On Sep 5, 2016, at 11:52 AM, Emery Stora wrote:
>>>
>>> They probably give great support as they don’t compress but their density would’t give as good dampening of vibrations.
>>>
>>> Emery Stora
>>> 77 Kingsley
>>> Frederick, CO
>>>
>>>> On Sep 5, 2016, at 9:38 AM, David H. Jarvis wrote:
>>>>
>>>> Hockey pucks sliced in half work good.
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
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>
> _______________________________________________
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| Re: [GMCnet] Body mounts [message #306621 is a reply to message #306619] |
Tue, 06 September 2016 16:18 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
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Senior Member |
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Loffen,
We agree that thick and thin refers to the support plate. I considered cutting the tubes but it didn't seem like an "easy adjustment" to me. It was "easier" for me to raise the body 3/8", fabricate 4 more support plates, buy some longer bolts and then mill 20 hockey pucks to 7/8" for body pads. Anyway, that extra space between the body and frame came in handy when I redesigned the fuel fill system.
http://www.gmcmhphotos.com/photos/g6420-fuel-supply.html
It fills real nice. None of the gurgling and guessing issues folks have with the factory fuel system. Plus the space inside the frame rail becomes available to use. I have to admit it turned into a lot more work than cutting the tubes on 4 isolators. That's a good solution if you're just retro-fitting new body pads.
JP
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