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[GMCnet] Blowout [message #93023] Fri, 23 July 2010 20:33 Go to previous message
Gary Berry is currently offline  Gary Berry   United States
Messages: 1002
Registered: May 2005
Karma:
Senior Member
Hey All;

So, I think I have more info on why my tire (7-year old Michelin)
blew out on my recent trip to the Oregon Coast. First of all, while I
was "parked" along the freeway replacing the blown tire, I did notice
that the tire seemed to be awfully hot, but I just contributed it to
the fact that it was 94 degrees out and the road was HOT. But as it
turns out, that might not have been the problem. When I put the spare
on, the tire wouldn't rotate forward. It would rotate to the rear, but
it would clunk when I tried to rotate it forward (this was on both of
the rear bogie tires). I did manage to drive it off of the freeway to
a tire place where I put the 2 new (well, two year old) Commercial
T/As on it. The brake guy said the brakes were too tight, so he
adjusted both of the rear bogie brakes (again, both rear bogie brakes
on each side were experiencing the same problem). Everything seemed
fine until I got outside of Winchester Bay, OR when my wife (who rides
in the back) started hearing a clicking sound. I pulled over, and the
pass rear bogie rim was warmer than the others (just by feeling them).
It was clunking again. I adjusted the brakes and continued on. After a
week of sitting in the cool of the Oregon coast (Bullards Beach and
Coos Bay), I made it to Florence, OR and Gene Fisher's place. After a
day or two, we pulled the rear wheels and tried to find out what was
going on in there. GeneF found that the parking brake lever on the
backing plate appeared to be engaged all of the time as compared to
the front bogie emergency brake lever that was disengaged. It appears
that the rear parking brake cable to the rear bogie on each side was
too short and was keeping the brake engaged. I don't know how it did
it, but even after re-adjusting the brakes, it would some how tighten
up to the point that the brakes were being engaged, thereby heating up
the rims and tires and eventually exploded the tire. We (or I so GeneF
doesn't have any liability in this) decided to detach the rear parking
brake cable from the rear bogie levers (I don't use the parking brake
anyway (we all know why)) and the trip home was uneventful. So, TSM
disc brakes are next with the line lock for parking. This setup might
even lead to a Reaction Arm Conversion if Mod-4 ever comes out. Thanks
to GeneF, Jim Hupy (you gotta meet this guy), and maybe Manny (you
really have to meet this guy) for all of the help in figuring this
out.

--
Gary and Diana Berry
73 CL Stretch in Wa.
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