| Lost wheel preliminary analysis [message #62801] |
Mon, 02 November 2009 14:25  |
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Tom Hampton has had a chance to take a look at the aftermath of my lost wheel and he thinks that there was bearing failure due to excessive heat from a dragging brake turning the grease to a liquid. I remember that the brake shoes picked up along the road by a good Samaritan were completely covered in black grease which seems to confirm Tom's analysis.
My coach has the carbon metallic brake shoes. I wonder if these contributed even more heat than would have been possible with "standard" brakes.
The outer inner bearing race was seized to the hub. Tom was able to knock it loose but there was indication that the bearing had spun.
Looks like I'm going to need everything from the bogey out including the backing plate and the axle. At least my wheel and tire survived.
Bill Brown - '77 Buckeye Cruiser
Coshocton OH
carguybill@sbcglobal.net
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| Re: [GMCnet] Lost wheel preliminary analysis [message #62803 is a reply to message #62801] |
Mon, 02 November 2009 14:34  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Bill,
It is usually the other way around. Bearing goes bad, seal goes away
from the heat, grease gets on everything and then comes the inevitable
separation from the coach. You can really hear those rear wheel
bearings when they start going bad. WAAaaaWAAaaaaaWAAAaaaaaa, you get
the idea. Sometimes, when it happens over a long period of time, you
start thinking that the noise is normal. I've had a couple go like
that but caught it before the really bad part happened.
On Mon, Nov 2, 2009 at 1:25 PM, Bill Brown <carguybill@sbcglobal.net> wrote:
>
>
> Tom Hampton has had a chance to take a look at the aftermath of my lost wheel and he thinks that there was bearing failure due to excessive heat from a dragging brake turning the grease to a liquid. I remember that the brake shoes picked up along the road by a good Samaritan were completely covered in black grease which seems to confirm Tom's analysis.
-
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Lost wheel preliminary analysis [message #62837 is a reply to message #62801] |
Mon, 02 November 2009 19:20 |
Jim White[1]
Messages: 144
Registered: September 2008
Karma: 0
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Senior Member |
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Bill-
I have a set of used backing plates for standard drum brakes that you
may have. I'll check to see if I can determine a left from a right and
if I can't, I'll just ship both of them. Should I ship to Tom or to you?
Just let me know-
Jim "Doc" White
Wintergreen, VA
75 GMC Stretch- (with 12.5" disc brakes in the middle)
Bill Brown wrote:
> Tom Hampton has had a chance to take a look at the aftermath of my lost wheel and he thinks that there was bearing failure due to excessive heat from a dragging brake turning the grease to a liquid. I remember that the brake shoes picked up along the road by a good Samaritan were completely covered in black grease which seems to confirm Tom's analysis.
>
> My coach has the carbon metallic brake shoes. I wonder if these contributed even more heat than would have been possible with "standard" brakes.
>
> The outer inner bearing race was seized to the hub. Tom was able to knock it loose but there was indication that the bearing had spun.
>
> Looks like I'm going to need everything from the bogey out including the backing plate and the axle. At least my wheel and tire survived.
>
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