Crazy Tire Wear

T

tony pascone

New member
Jul 23, 2019
4
0
0
Hello All,

Seeing some very strange tire wear... Hoping for some guidance..

In the link below (last four photos) you will see the tire wear on the right rear (front) tire and how strange the wear pattern is.

You can see the steel belt wearing through one both sides of the tire along with cupping in the center of the tire.

Is this from a single event (skid)? Broken steel belt possibly for the cuping? Alignment?? If alignment, who could fix this type of issue on a GMC
motorhome? Truck repair? Buy some hydraulics and bend myself?

https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9

All the best,

Tony Pascone

--
Tony Pascone
Asheville, North Carolina 28804
828-838-4247

1973 GMC Glacier Bay
Owner since 7/13/2019

Mods:
Some sort of quad bag system
Generac Generator 6.5kW
Macerator
Battery Combiner
Still going through it>
 
Better check your tire ptessure.

Emery Stora

>
> Hello All,
>
> Seeing some very strange tire wear... Hoping for some guidance..
>
> In the link below (last four photos) you will see the tire wear on the right rear (front) tire and how strange the wear pattern is.
>
> You can see the steel belt wearing through one both sides of the tire along with cupping in the center of the tire.
>
> Is this from a single event (skid)? Broken steel belt possibly for the cuping? Alignment?? If alignment, who could fix this type of issue on a GMC
> motorhome? Truck repair? Buy some hydraulics and bend myself?
>
> https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9
>
> All the best,
>
> Tony Pascone
>
> --
> Tony Pascone
> Asheville, North Carolina 28804
> 828-838-4247
>
> 1973 GMC Glacier Bay
> Owner since 7/13/2019
>
> Mods:
> Some sort of quad bag system
> Generac Generator 6.5kW
> Macerator
> Battery Combiner
> Still going through it>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Hello Emory,
Thanks for suggestion.
Was right at 80 PSI.
This coach is 3 weeks old to me so there is no telling what they went through in their past life..

Tony

--
Tony Pascone
Asheville, North Carolina 28804
828-838-4247

1973 GMC Glacier Bay
Owner since 7/13/2019

Mods:
Some sort of quad bag system
Generac Generator 6.5kW
Macerator
Battery Combiner
Still going through it>
 
Agree with Emery. Tire pressure might be ok now but it wasn’t when that
happened.

Sully
Bellevue wa.

On Thu, Aug 1, 2019 at 11:27 AM Tony Pascone via Gmclist <

> Hello Emory,
> Thanks for suggestion.
> Was right at 80 PSI.
> This coach is 3 weeks old to me so there is no telling what they went
> through in their past life..
>
> Tony
>
> --
> Tony Pascone
> Asheville, North Carolina 28804
> 828-838-4247
>
> 1973 GMC Glacier Bay
> Owner since 7/13/2019
>
> Mods:
> Some sort of quad bag system
> Generac Generator 6.5kW
> Macerator
> Battery Combiner
> Still going through it>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
80 psi is too hard. you need to weigh your coach, then check the tire manufacture data sheet to see what pressure is required for the actual weight
on each axle. use the weight load on the heavier tire. 70 psi is a good starting point until you get a real weight per axle.
Tom
--
2012 Phoenix Cruiser model 2552
KA4CSG
 
I have never run 80PSI in the coaches that I have owned since 1998, your coach probably rides real ruff. I have a set of tires that looks almost exactly like yours our in the shop on set of Alcoa’s that I will change when I get the 75 Avion finished. Turned out that the rear shocks were bad and I mean really bad, they had no action. The 77 Eleganza II came with a set of Caspro HD shocks on the back. The shocks looked good but they were flat worn out. What brand of shock do you have installed on the back of the coach? I typically ran 60 all the way around on the Ele II and run 65# on the stretch coach. You can go thru the exercise of the weighing the coach and looking at the tire tables, but my guess is that your end result will be 60 to 65 PSIG. Just because they may be a Bilstein or a KYB or SOB doesn’t make them bullet proof.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

>
> Hello All,
>
> Seeing some very strange tire wear... Hoping for some guidance..
>
> In the link below (last four photos) you will see the tire wear on the right rear (front) tire and how strange the wear pattern is.
>
> You can see the steel belt wearing through one both sides of the tire along with cupping in the center of the tire.
>
> Is this from a single event (skid)? Broken steel belt possibly for the cuping? Alignment?? If alignment, who could fix this type of issue on a GMC
> motorhome? Truck repair? Buy some hydraulics and bend myself?
>
> https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9
>
> All the best,
>
> Tony Pascone
>
> --
> Tony Pascone
> Asheville, North Carolina 28804
> 828-838-4247
>
> 1973 GMC Glacier Bay
> Owner since 7/13/2019
>
> Mods:
> Some sort of quad bag system
> Generac Generator 6.5kW
> Macerator
> Battery Combiner
> Still going through it>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Bring your coach to the GMCMI rally at Mansfield, OH on October 4 through 10.

I am bringing my scales again and we will be weighing coaches and measuring ride heights. I am not sure what day we will do it, but if you are not
there for the whole week, and are willing to help set the scales up, we will have a special weigh-in just for you.

https://www.gmcmi.com/upcoming-events/

Looking at your tire it appears that you have a very common problem on GMCs. Drivers cut a corner too close when turning right and bend the right
middle bogie by hitting a curb.

It is possible to bend it back. I have seen done several. My favorite is a portapower and a 6' straight edge. Remove the wheels nd put a straight
edge across the drum faces. It will be easy to see when the front and rear are in line while pushing it outward from the frame with a portapower.
You will have to over bend it a little bit and then relax it to get it correct. I attended one rally where someone built a screw type device and
straightened about 10 coaches without removing the wheels. You need to do something before replacing that tire even if it is not exact. I also have
a set of alignment tools that can be attached to the wheels and aligned without removing the wheels. That tire is worn on both sides because someone
reversed the tire on the wheel to wear on the opposite side. That straightening can easily be done in under an hour. Use an additional steel plate
between the portapower and the frame when doing this to keep from bending the frame. I have also seen it done with an old wheel and a long piece of
pipe
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
In your photos it looks like you have a leaking filler pipe? I'm working on my tanks right now and bought a foot each of 1" and 1-3/8" filler hose,
I'm going to have some left over. Let me know if you want a piece of it to make that repair, I'll mail you a piece.

--
Todd Snyder, Buffalo NY
1976 Eleganza II
 
Dale Ropp is the person who developed the screw device to straighten the arm.

Emery Stora

>
> Bring your coach to the GMCMI rally at Mansfield, OH on October 4 through 10.
>
> I am bringing my scales again and we will be weighing coaches and measuring ride heights. I am not sure what day we will do it, but if you are not
> there for the whole week, and are willing to help set the scales up, we will have a special weigh-in just for you.
>
> https://www.gmcmi.com/upcoming-events/
>
> Looking at your tire it appears that you have a very common problem on GMCs. Drivers cut a corner too close when turning right and bend the right
> middle bogie by hitting a curb.
>
> It is possible to bend it back. I have seen done several. My favorite is a portapower and a 6' straight edge. Remove the wheels nd put a straight
> edge across the drum faces. It will be easy to see when the front and rear are in line while pushing it outward from the frame with a portapower.
> You will have to over bend it a little bit and then relax it to get it correct. I attended one rally where someone built a screw type device and
> straightened about 10 coaches without removing the wheels. You need to do something before replacing that tire even if it is not exact. I also have
> a set of alignment tools that can be attached to the wheels and aligned without removing the wheels. That tire is worn on both sides because someone
> reversed the tire on the wheel to wear on the opposite side. That straightening can easily be done in under an hour. Use an additional steel plate
> between the portapower and the frame when doing this to keep from bending the frame. I have also seen it done with an old wheel and a long piece of
> pipe
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Thanks Emery,
This is the drawing of Dales Bogy Arm Straightener

http://www.gmcmhphotos.com/photos/strightening-bogie-arm/p14686.html

JR Wright
Michigan

>
> Dale Ropp is the person who developed the screw device to straighten the arm.
>
> Emery Stora
>

>>
>> Bring your coach to the GMCMI rally at Mansfield, OH on October 4 through 10.
>>
>> I am bringing my scales again and we will be weighing coaches and measuring ride heights. I am not sure what day we will do it, but if you are not
>> there for the whole week, and are willing to help set the scales up, we will have a special weigh-in just for you.
>>
>> https://www.gmcmi.com/upcoming-events/
>>
>> Looking at your tire it appears that you have a very common problem on GMCs. Drivers cut a corner too close when turning right and bend the right
>> middle bogie by hitting a curb.
>>
>> It is possible to bend it back. I have seen done several. My favorite is a portapower and a 6' straight edge. Remove the wheels nd put a straight
>> edge across the drum faces. It will be easy to see when the front and rear are in line while pushing it outward from the frame with a portapower.
>> You will have to over bend it a little bit and then relax it to get it correct. I attended one rally where someone built a screw type device and
>> straightened about 10 coaches without removing the wheels. You need to do something before replacing that tire even if it is not exact. I also have
>> a set of alignment tools that can be attached to the wheels and aligned without removing the wheels. That tire is worn on both sides because someone
>> reversed the tire on the wheel to wear on the opposite side. That straightening can easily be done in under an hour. Use an additional steel plate
>> between the portapower and the frame when doing this to keep from bending the frame. I have also seen it done with an old wheel and a long piece of
>> pipe
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> 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
 
Thanks for the input guys...

Here's where I am:

1. Removed both wheels
2. Placed a straight edge along both brake disks
3. There appears to be zero gap along the surface of either disc brake. Would this indicate that alignment is ok??? At least along the horizontal
axis?

A couple guys mentioned bad shocks could be the culprit. A way to test them? Or simply replace them?

The photos are the at the end of the album in this link..

https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9

Thanks,

Tony
--
Tony Pascone
Asheville, North Carolina 28804
828-838-4247

1973 GMC Glacier Bay
Owner since 7/13/2019

Mods:
Some sort of quad bag system
Generac Generator 6.5kW
Macerator
Battery Combiner
Still going through it>
 
> Thanks for the input guys...
> Here's where I am:
> 1. Removed both wheels
> 2. Placed a straight edge along both brake disks
> 3. There appears to be zero gap along the surface of either disc brake. Would this indicate that alignment is ok??? At least along the horizontal
> axis?
> A couple guys mentioned bad shocks could be the culprit. A way to test them? Or simply replace them?
> The photos are the at the end of the album in this link..
> https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9
> Thanks,
> Tony

Tony,

Bad shocks might or loose wheel bearings might be an issue with the cupping wear, but you should also give the arms a push pull test while they are
unloaded. Maybe a bearing in there is worn. Many owners do not put nearly enough grease in there.

The KYB shocks are not that expensive and the are a little hard to evaluate when removed as they are (should be) gas charged. The are also backward
damping, so get the right part number.

Honestly, that wear looks like the PO ran with the pressure way low for the load on that tire. When you get her back on the ground with the new
shoes, get to a truck scale (or come to Mansfield) and get good weights. Set the tire pressures based on that weight.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
Tony,
I see that you have KYB shocks on the rear. They are a good shock, but doesn’t mean that they won’t wear out. To check remove shock and see if you have compression it should be very difficult the move the shock in one direction. After looking at the tires, it looks like a common fault problem, by that I mean the same issue is on both sides.

JR Wright
Michigan

>
> Thanks for the input guys...
>
> Here's where I am:
>
> 1. Removed both wheels
> 2. Placed a straight edge along both brake disks
> 3. There appears to be zero gap along the surface of either disc brake. Would this indicate that alignment is ok??? At least along the horizontal
> axis?
>
> A couple guys mentioned bad shocks could be the culprit. A way to test them? Or simply replace them?
>
> The photos are the at the end of the album in this link..
>
> https://photos.app.goo.gl/uYrDsA8wvUHSJttZ9
>
> Thanks,
>
> Tony
> --
> Tony Pascone
> Asheville, North Carolina 28804
> 828-838-4247
>
> 1973 GMC Glacier Bay
> Owner since 7/13/2019
>
> Mods:
> Some sort of quad bag system
> Generac Generator 6.5kW
> Macerator
> Battery Combiner
> Still going through it>
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
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