| [GMCnet] Urethane Motor Mount [message #266503] |
Sat, 22 November 2014 07:05  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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I finally got around to investigating why the Cad500's fan hits the shroud
when I really "get on it". I'd expected to find a broken rear motor mount.
Instead I found that the front mount's rubber has separated from the metal
housing.
While I recognize that JimK has new (or maybe rebuilt) mounts, and that
there are other sources for rebuilding, I'd sort of like to try doing it
myself. Considering the cost of the pourable urethane, the labor & mess
involved, and the likelihood I'll have to do it more than once, it's
probably not a cost-effective solution.
Has anyone here had experience pouring urethane for such an application?
Results? What density urethane? Is the adhesion to the metal adequate?
Not really wanting to be a pioneer on this. :-)
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Urethane Motor Mount [message #266508 is a reply to message #266505] |
Sat, 22 November 2014 09:06  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Ken,
If found this on using urethane in rebuilding motor mounts.
http://www.fatfenderedtrucks.com/casting_product.html
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On Nov 22, 2014, at 8:26 AM, Steve Southworth wrote:
>
> Ken Henderson wrote on Sat, 22 November 2014 07:05
>> Has anyone here had experience pouring urethane for such an application?
>> Results? What density urethane? Is the adhesion to the metal adequate?
>>
>> Not really wanting to be a pioneer on this. :)
>>
>> Ken H.
>
>
> I suspect you have done this already. Google: rebuilding motor mount urethane
>
> There appears to be a lot of good info there. Thanks for bringing this up. I have a different application that this may solve (non-GMC) and I had
> not considered this method.
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Urethane Motor Mount [message #266509 is a reply to message #266508] |
Sat, 22 November 2014 09:18 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Lets try again.
http://www.fatfenderedtrucks.com/motor_mount_rebuild.html
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On Nov 22, 2014, at 10:06 AM, John Wright wrote:
>
> Ken,
> If found this on using urethane in rebuilding motor mounts.
>
> http://www.fatfenderedtrucks.com/casting_product.html
>
> JR Wright
> 78 Buskirk Stretch
> 75 Avion
> Michigan
>
>> On Nov 22, 2014, at 8:26 AM, Steve Southworth wrote:
>>
>> Ken Henderson wrote on Sat, 22 November 2014 07:05
>>> Has anyone here had experience pouring urethane for such an application?
>>> Results? What density urethane? Is the adhesion to the metal adequate?
>>>
>>> Not really wanting to be a pioneer on this. :)
>>>
>>> Ken H.
>>
>>
>> I suspect you have done this already. Google: rebuilding motor mount urethane
>>
>> There appears to be a lot of good info there. Thanks for bringing this up. I have a different application that this may solve (non-GMC) and I had
>> not considered this method.
>> --
>> Steve Southworth
>> 1974 Glacier TZE064V100150 (for workin on)
>> 1975 Transmode TZE365V100394 (parts & spares)
>> Palmyra WI
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Urethane Motor Mount [message #266512 is a reply to message #266509] |
Sat, 22 November 2014 10:25 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Ken, You are the leader on very many things for the GMC. Pouring the motor mount you could do in your sleep.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Urethane Motor Mount [message #266549 is a reply to message #266508] |
Sat, 22 November 2014 21:27 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Thanks JR. I'd read that complete article earlier today. That, and all
the other articles make it sound easy to do, though hard to confine the
material to the intended space. Unfortunately, most are for smaller
engines, many of them just reinforcing existing mounts. The configuration
of our mounts is quite different from the "modern" ones.
Ken H.
On Sat, Nov 22, 2014 at 10:06 AM, John Wright
wrote:
> Ken,
> If found this on using urethane in rebuilding motor mounts.
>
> http://www.fatfenderedtrucks.com/casting_product.html
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Urethane Motor Mount [message #266552 is a reply to message #266548] |
Sat, 22 November 2014 22:00 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
Yes, I know about Steel Rubber Products. The price they wanted to re-mold
them was one of the reasons I designed a new front mount to continue using
the Olds 455 mount. The other reason was that the Cad mount is "upside
down" -- it catches and holds oil drips on the rubber, unlike the Olds,
which sheds them with steel. JimK has Olds mounts in stock, but I'd like
to try making my own, with cost being secondary.
Ken H.
On Sat, Nov 22, 2014 at 10:28 PM, John Biwersi wrote:
> Ken, I assume you are aware that Steel Rubber Products in North Carolina
> has remolded several of these 500 Cadillac front mounts. They did two for me
> and one for Larry W.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Urethane Motor Mount [message #266615 is a reply to message #266503] |
Mon, 24 November 2014 08:40 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Just keep in mind that urethane is considered low temperature range product. Ever notice how upper control arm bushings in poly where the manifolds are in close proximity don't last ?
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Urethane Motor Mount [message #266629 is a reply to message #266615] |
Mon, 24 November 2014 12:21 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
I had noticed the Max Temp column in McMaster-Carr's catalog generally says
180*F. Not very reassuring for something supporting a 195*F+ engine a few
inches away. :-)
Somewhere I saw some higher temp urethane, but I don't recall where now.
Ken H.
On Mon, Nov 24, 2014 at 9:40 AM, John R. Lebetski
wrote:
> Just keep in mind that urethane is considered low temperature range
> product. Ever notice how upper control arm bushings in poly where the
> manifolds
> are in close proximity don't last ?
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Urethane Motor Mount [message #266634 is a reply to message #266629] |
Mon, 24 November 2014 13:11 |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Senior Member |
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Not sure that in this application going to a stiffer suspension is better.
There has to be some give-- also decoupling. If the fan hits the shroud,
you may not be centered with the shroud. You had to rig it in there
probably so I would check that out. If the motor mount is oil soaked and
came apart, get another one. Hey it's lasted this long...
Sometimes you just need another mousetrap of the same variety, especially
if you have to make the newer, bigger, better, stronger one... There may
be a reason folks don't make that...
Jim Bounds
--------------------------
On Mon, Nov 24, 2014 at 1:21 PM, Ken Henderson
wrote:
> John,
>
> I had noticed the Max Temp column in McMaster-Carr's catalog generally says
> 180*F. Not very reassuring for something supporting a 195*F+ engine a few
> inches away. :-)
>
> Somewhere I saw some higher temp urethane, but I don't recall where now.
>
> Ken H.
>
>
> On Mon, Nov 24, 2014 at 9:40 AM, John R. Lebetski >
> wrote:
>
>> Just keep in mind that urethane is considered low temperature range
>> product. Ever notice how upper control arm bushings in poly where the
>> manifolds
>> are in close proximity don't last ?
>> --
>>
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| Re: [GMCnet] Urethane Motor Mount [message #266927 is a reply to message #266634] |
Sat, 29 November 2014 19:15 |
mild bill
Messages: 98
Registered: November 2014
Location: Edmonton, Alberta, Canada
Karma: 0
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I was fixing up our Cherokee for my daughter to drive, pulled the engine to replace the leaking frost plug behind the transmission and flex plate, anyhow one mount was torn and having rebuilt and filled mounts before with pour urethane all I had in the shop was Sikaflex 252. Seems to have worked great!
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