James, I have experienced a shimmy a couple of times that turned out to be a
delaminating tire on the rear. It was a shimmy at slow speeds but turned
into vibration at higher ones. In the first case, the tire failed at about
60 mph and beat hell out of my lower rear fender before I could get the car
stopped. I learned my lesson from that and didn't let the second one go
long enough to cause a blow-out.
BTW, the blowout and short time of running on the blown tire damaged the
wheel enough that it can't be perfectly trued anymore (per Allen Hendrix),
although I'm still using it. It doesn't cause any noticeable vibration,
though.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
-----Original Message-----
From: healeys-bounces+sbyers=ec.rr.com@autox.team.net
[mailto:healeys-bounces+sbyers=ec.rr.com@autox.team.net] On Behalf Of James
Lea
Sent: Wednesday, August 13, 2008 5:21 PM
To: List Healeys
Subject: [Healeys] Shimmy.
In the last few months I have developed a shimmy that starts at fifty MPH
and gets worse as the speed increases. Several good mechanics have looked at
it. One said the front end was out of line. One said the front tires were
out of balance. I checked both front tires on my bubble balancer and they
were both right on.
Today I had a flat on the left rear. I put on the spare and the shimmy is
GONE!! I inspected the tire and found it scalloped but only for twelve
inches in one section near the edge of the tread.
Weird! What would cause a rear tire to scallop like that and would that
effect the entire car and cause the shimmy? Tomorrow I am going to put the
flat rim on the car, jack up the rear end and see if the rim might be out of
round or not running true. Cheers, JL
James Lea
PO Box 25
Rockport Maine 04856
1-207-236-3632
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