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| Motor Mounts [message #216529] |
Thu, 01 August 2013 11:29  |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Here's one for you: Was out enjoying the fruits of my labor, in the GMC, today. Hotrodded it all over town enjoying stopping at every red light to feel the all disc brakes and to hear the engine idle. Parked on a hill at my daughter's to check on my grandkids. Put it in reverse to back up a pretty steep incline and heard what sounded like a stick dragging real hard on the blacktop. I had my foot in it more than normal backing up the hill. Got out of the gas and it stopped. Tried it again and heard it once more. Now, I have a glass engine cover and I keep it clean so I can see what is happening. Well, When in reverse, with my foot hard on throttle, the rear of the engine, on passenger side is jumping up. I am sure it is causing something to be misalligned and making the noise. When I get out of the throttle the engine goes back to normal resting place. Stop on flat and hold foot on brake, with lots of throttle in reverse, I can make the engine come up on rear pass side. Forward all is good.
So, the right rear mount is busted or loose. I suspect it has seperated. What do you think? This is hard to tell, from my experience, by just looking at one. We had the engine and trans out a couple of years back, never noticed anything. May have just snapped or it may have been this way for 50,000 miles, as I have never gunned it in reverse to back up a steep hill before.
Bottom line, is it hard for one guy to replace?
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: [GMCnet] Motor Mounts [message #216535 is a reply to message #216529] |
Thu, 01 August 2013 12:20  |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
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It could be the mount but make sure that the bolts/nuts didn't rattle off. The top ones aren't too hard to find. The lower ones are inside a hole in the cross-member.
JP
>________________________________
> From: Dan Gregg <gregg_dan@hotmail.com>
>To: gmclist@temp.gmcnet.org
>Sent: Thursday, August 1, 2013 12:29 PM
>Subject: [GMCnet] Motor Mounts
>
>
>
>
>Here's one for you: Was out enjoying the fruits of my labor, in the GMC, today. Hotrodded it all over town enjoying stopping at every red light to feel the all disc brakes and to hear the engine idle. Parked on a hill at my daughter's to check on my grandkids. Put it in reverse to back up a pretty steep incline and heard what sounded like a stick dragging real hard on the blacktop. I had my foot in it more than normal backing up the hill. Got out of the gas and it stopped. Tried it again and heard it once more. Now, I have a glass engine cover and I keep it clean so I can see what is happening. Well, When in reverse, with my foot hard on throttle, the rear of the engine, on passenger side is jumping up. I am sure it is causing something to be misalligned and making the noise. When I get out of the throttle the engine goes back to normal resting place. Stop on flat and hold foot on brake, with lots of throttle in reverse, I can make the engine come up on
rear pass side. Forwar
>d all is good.
>So, the right rear mount is busted or loose. I suspect it has seperated. What do you think? This is hard to tell, from my experience, by just looking at one. We had the engine and trans out a couple of years back, never noticed anything. May have just snapped or it may have been this way for 50,000 miles, as I have never gunned it in reverse to back up a steep hill before.
>Bottom line, is it hard for one guy to replace?
>Dan
>--
>Dan & Teri Gregg
>Dexter, Mo.
>
>http://danandteri.blogspot.com/
>
>
>
>
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| Re: [GMCnet] Motor Mounts [message #216541 is a reply to message #216529] |
Thu, 01 August 2013 14:12 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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You lost the trans bracket to trans mount bolts on right side or more likely the trans mount to frame clip bolt or trans mount to trans bracket bolt on the right rear.
Todd Sullivan
Sully
77 royale
Seattle
On Aug 1, 2013, at 9:29 AM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Here's one for you: Was out enjoying the fruits of my labor, in the GMC, today. Hotrodded it all over town enjoying stopping at every red light to feel the all disc brakes and to hear the engine idle. Parked on a hill at my daughter's to check on my grandkids. Put it in reverse to back up a pretty steep incline and heard what sounded like a stick dragging real hard on the blacktop. I had my foot in it more than normal backing up the hill. Got out of the gas and it stopped. Tried it again and heard it once more. Now, I have a glass engine cover and I keep it clean so I can see what is happening. Well, When in reverse, with my foot hard on throttle, the rear of the engine, on passenger side is jumping up. I am sure it is causing something to be misalligned and making the noise. When I get out of the throttle the engine goes back to normal resting place. Stop on flat and hold foot on brake, with lots of throttle in reverse, I can make the engine come up on rear pass side. Forw
ar
> d all is good.
> So, the right rear mount is busted or loose. I suspect it has seperated. What do you think? This is hard to tell, from my experience, by just looking at one. We had the engine and trans out a couple of years back, never noticed anything. May have just snapped or it may have been this way for 50,000 miles, as I have never gunned it in reverse to back up a steep hill before.
> Bottom line, is it hard for one guy to replace?
> Dan
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
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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] Motor Mounts [message #216550 is a reply to message #216543] |
Thu, 01 August 2013 16:53 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Look for empty holes.
Todd Sullivan
Sully
77 royale
Seattle
On Aug 1, 2013, at 12:20 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> sgltrac wrote on Thu, 01 August 2013 14:12
>> You lost the trans bracket to trans mount bolts on right side or more likely the trans mount to frame clip bolt or trans mount to trans bracket bolt on the right rear.
>>
>> Todd Sullivan
>>
>> Sully
>> 77 royale
>> Seattle
>> On Aug 1, 2013, at 9:29 AM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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>
> Holy Crap!! This dont sound good.
>
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
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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] Motor Mounts [message #216718 is a reply to message #216536] |
Fri, 02 August 2013 21:20 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| WD0AFQ wrote on Thu, 01 August 2013 13:08 |
So, I am assuming bad motor mount. I need to go find a picture of it.
Dan
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My front clip is still out so it is easy to take pics of the rear motor mounts as installed. Do you want some photos of the mount from any particular direction or showing some specific detail?
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Motor Mounts [message #217050 is a reply to message #217043] |
Mon, 05 August 2013 11:57 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| WD0AFQ wrote on Mon, 05 August 2013 11:34 |
Thank you Steve and every one that has responded here or via email. I have sold the front mounts off Jim's tables but can never recall anyone needing a rear one, so I have not pictured in my mind just how this thing "connects". I suppose when I see the mount to use for replacement I will be able to figure this out. It is affecting my 3 inch exhaust so I better replace the thing. Surely I can jack up the front and then jack the tranny a little and swap it out. But, the bottom bolt is spinning so may have to figure some way to hold it.
It is raining today and I am high on dope from dentist cutting two jaw teeth out this morning. So, will look harder at this when my circumstances change.
Dan
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It is, as you know, held onto the frame by one bolt, don't remember the size (other than BIG). I think it may be sawzall time. As you are also aware by now, getting at the top bolts is a bugger as it sits all installed.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Motor Mounts [message #217051 is a reply to message #217043] |
Mon, 05 August 2013 11:55 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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You might try applying upward pressure on the bracket forward of the mount where the bracket bolts to the trans. With upward pressure you might be able to spin the bolt out with a high speed impact. If your fender liner is installed, removing it as well as the wheel will give you much better visual access.
Lifting under the bracket will also give you confirmation of the failure being the mount and not the bracket.
I have good access to mine if you want photos. Send me your email
Todd Sullivan
Sully
77 royale
Seattle
On Aug 5, 2013, at 9:34 AM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Thank you Steve and every one that has responded here or via email. I have sold the front mounts off Jim's tables but can never recall anyone needing a rear one, so I have not pictured in my mind just how this thing "connects". I suppose when I see the mount to use for replacement I will be able to figure this out. It is affecting my 3 inch exhaust so I better replace the thing. Surely I can jack up the front and then jack the tranny a little and swap it out. But, the bottom bolt is spinning so may have to figure some way to hold it.
> It is raining today and I am high on dope from dentist cutting two jaw teeth out this morning. So, will look harder at this when my circumstances change.
> Dan
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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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] Motor Mounts [message #217073 is a reply to message #217051] |
Mon, 05 August 2013 15:07 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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| sgltrac wrote on Mon, 05 August 2013 11:55 |
You might try applying upward pressure on the bracket forward of the mount where the bracket bolts to the trans. With upward pressure you might be able to spin the bolt out with a high speed impact. If your fender liner is installed, removing it as well as the wheel will give you much better visual access.
Lifting under the bracket will also give you confirmation of the failure being the mount and not the bracket.
I have good access to mine if you want photos. Send me your email
Todd Sullivan
Sully
77 royale
Seattle
On Aug 5, 2013, at 9:34 AM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Thank you Steve and every one that has responded here or via email. I have sold the front mounts off Jim's tables but can never recall anyone needing a rear one, so I have not pictured in my mind just how this thing "connects". I suppose when I see the mount to use for replacement I will be able to figure this out. It is affecting my 3 inch exhaust so I better replace the thing. Surely I can jack up the front and then jack the tranny a little and swap it out. But, the bottom bolt is spinning so may have to figure some way to hold it.
> It is raining today and I am high on dope from dentist cutting two jaw teeth out this morning. So, will look harder at this when my circumstances change.
> Dan
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Thanks Todd.
gregg_dan@hotmail.com
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: [GMCnet] Motor Mounts [message #217075 is a reply to message #217073] |
Mon, 05 August 2013 15:35 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Dan, there are at least (2) two different rear mounts. One style has
imbedded into the rubber a special stud that protrudes through the steel
saddle towards the bottom of the coach. When you are under the coach,
looking up all you see will be a threaded stud with a flanged nut screwed
onto it. That is not the style that I believe you have.
The second type just has a bolt and lockwasher visible on the bottom. The
steel saddle is threaded, the rubber mount is bonded to the saddle. When
the rubber bond is broken, as I suspect yours is, the mount and saddle
separate. As long as the weight of the engine/transmission is bearing down
on the mount, everything is sorta O.K. But when you load up the drive train
in reverse, nothing is keeping the assembly in place and they rear up, like
yours does. In all likelihood, the threads in the steel saddle are
stripped and the bolt will not tighten up.
If you have the stud and nut mount, and the stud turns without tightening
up, the same thing has happened. It has come unbonded. Replacement is the
cure. The two upper bolts that secure the assembly to the housing cover are
not easy to get to with the engine and transmission in place. Guess how I
know all this. BTDT.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Aug 5, 2013 1:07 PM, "Dan Gregg" <gregg_dan@hotmail.com> wrote:
>
>
> sgltrac wrote on Mon, 05 August 2013 11:55
> > You might try applying upward pressure on the bracket forward of the
> mount where the bracket bolts to the trans. With upward pressure you might
> be able to spin the bolt out with a high speed impact. If your fender liner
> is installed, removing it as well as the wheel will give you much better
> visual access.
> > Lifting under the bracket will also give you confirmation of the failure
> being the mount and not the bracket.
> > I have good access to mine if you want photos. Send me your email
> >
> > Todd Sullivan
> >
> > Sully
> > 77 royale
> > Seattle
> > On Aug 5, 2013, at 9:34 AM, Dan Gregg <gregg_dan@hotmail.com> wrote:
> >
> > >
> > >
> > > Thank you Steve and every one that has responded here or via email. I
> have sold the front mounts off Jim's tables but can never recall anyone
> needing a rear one, so I have not pictured in my mind just how this thing
> "connects". I suppose when I see the mount to use for replacement I will be
> able to figure this out. It is affecting my 3 inch exhaust so I better
> replace the thing. Surely I can jack up the front and then jack the tranny
> a little and swap it out. But, the bottom bolt is spinning so may have to
> figure some way to hold it.
> > > It is raining today and I am high on dope from dentist cutting two jaw
> teeth out this morning. So, will look harder at this when my circumstances
> change.
> > > Dan
> > > --
> > > Dan & Teri Gregg
> > > Dexter, Mo.
> > >
> > > http://danandteri.blogspot.com/
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> Thanks Todd.
> gregg_mailto:dan@hotmail.com
>
> Dan
>
> --
> Dan & Teri Gregg
> Dexter, Mo.
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Motor Mounts [message #217077 is a reply to message #217075] |
Mon, 05 August 2013 15:46 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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If one could somehow get those difficult two upper bolts out, can the rubber then be pulled out giving access to both ends of the bolt/stud?
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Motor Mounts [message #217080 is a reply to message #217077] |
Mon, 05 August 2013 16:00 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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No. The problem is, the rubber has deteriorated. No bond exists between the
parts.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Aug 5, 2013 1:47 PM, "Don Adams" <dj.adams@att.net> wrote:
>
>
>
> If one could somehow get those difficult two upper bolts out, can the
> rubber then be pulled out giving access to both ends of the bolt/stud?
> --
> Don Adams Dallas, TX
> '76 26' Glenbrook, '90 Sidekick
> rebuilt by R Archer, powered by J Bounds, Koba
>
> _______________________________________________
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| Re: [GMCnet] Motor Mounts [message #217083 is a reply to message #217080] |
Mon, 05 August 2013 16:11 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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<<<< The problem is, the rubber has deteriorated. No bond exists between the parts. >>>>
Wait Jim, that is what I'm saying! Since the rubber is shot can you pull it out so you can then grab hold of the lower stud on both ends to get it loose from the frame?
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Motor Mounts [message #217086 is a reply to message #217083] |
Mon, 05 August 2013 16:46 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Don, the mount consists of three main parts..There is a rubber block, with
a reinforcement steel piece molded into it. The block has two upward
accessible nuts, and one downward facing stud or a threaded hole in it to
match up with the lower nut or bolt. Over the top of the rubber block is a
steel stamping that the block locates into. The third piece is also a
stamping that is large enough in size that the rubber block and the upper
stamping both fit inside. When assembled, you have a sandwich. How they
usually fail is, gas oil and tyranny fluid attack the rubber part and it
fails, usually a gooey soft mess. Because all the fasteners are retained by
the rubber block, nothing holds the sandwich together. The engine is free
to lift up when the torque reaction forces are greater than the gravity
that holds the engine in place. If both sides happen to fail at the same
time, one MIGHT HAVE enough room to raise the assembly high enough to
replace the mounts..but.
Jim Hupy
Salem, Or
78 Gmc Royale 403.
On Aug 5, 2013 2:11 PM, "Don Adams" <dj.adams@att.net> wrote:
>
>
>
> <<<< The problem is, the rubber has deteriorated. No bond exists between
> the parts. >>>>
>
>
> Wait Jim, that is what I'm saying! Since the rubber is shot can you pull
> it out so you can then grab hold of the lower stud on both ends to get it
> loose from the frame?
> --
> Don Adams Dallas, TX
> '76 26' Glenbrook, '90 Sidekick
> rebuilt by R Archer, powered by J Bounds, Koba
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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