I have a similar vibration problem. I've read several times that the problem
is often that the TR wheels shold be balanced on a machine that has a
"lug-centric" adapter, rather than the hub-centric system that most balance
machines use. I haven't found a local place yet, but I haven't really been
looking either. I've heard that some of the higher end imports may require
lug-centric balancing.
But your point, Alex about hub run out is well taken. Think I'll check that
out.
Tom
----- Original Message -----
From: "Italyfound" <italyfound@gmail.com>
To: <thenicholls@verizon.net>
Cc: "*Triumphs List" <triumphs@autox.team.net>
Sent: Sunday, November 01, 2015 7:00 PM
Subject: Re: [TR] Vibration at Speed
> Been a while since I posted but this caught my eye.
>
> I had the same problem with my 72 TR6. Took a while to solve the problem
> but I would bet money this is your problem too.
>
> My problem was with the face of the hubs. Mine turned out not to be flat
> but had a noticeable runout. You can check yours by removing the tire and
> wheel and with a run out guage check the surface front to back and top to
> bottom. If you a that there is an issue have them surface ground at a
> machine shop. Simple process. Solved my problem immediately....
>
> What occurs when they are bad is when you tighten down the lug nuts the
> wheel is actually distorted to match the face of the hub.
>
> Alex Manzo
> 72 TR6
> 59 TR3A
>
>
>
> ----- Original Message -----
> From: <thenicholls@verizon.net>
> To: <r_rochlin@hotmail.com>; <triumphs@autox.team.net>
> Sent: Tuesday, November 03, 2015 12:26 AM
> Subject: Re: [TR] Vibration at Speed
>
>
>> Bob, I have a 72 TR6 myself, the whole front end has been rebuilt, and
>> the tires are all in balance.
>>
>>
>> I have a vibration between 60 and 65, I just step on the gas and go a
>> little faster until it stops.
>>
>>
>> It has always been that way so I am kind of used to it.
>>
>>
>> Good luck with yours.
>>
>>
>> Craig
>> 72 TR6 Vienna, VA
>>
>>
>> On 11/02/15, Bob Rochlin<r_rochlin@hotmail.com> wrote:
>>
>> Hi Everyone,
>> Over the summer I got a new set of Michelins for my TR6. The old tires
>> were 15 years old and were causing some shimmy vibration as well as being
>> well past safe. This was in connection with getting my wire wheels
>> straightened and trued. The wires guy, New England Wire Wheel, mounted
>> and balanced the tires with a Snap-on static balancer . When I got the
>> wheels back on the car I went out for a ride and felt a definite
>> vibration between 65 and 75 MPH. I concluded that the wheels needed to be
>> rebalanced with a dynamic balancer. I found a shop who could balance the
>> tires correctly and had them rebalanced. The tires were little better,
>> but there was still a pronounced vibration in the seat and body at 65 to
>> 75 MPH. I brought the tires back to the tire shop and they graciously
>> first checked the tire balance and then rebalanced them. They said that
>> the balance was of about a 1/4 oz. , and that two of the tires seemed to
>> be a very slightly out of round. I mount those tire on the rear, but aga
>> in the same problem.
>> I've moved the tires from front to back thinking if the offending tires
>> were on the front wheels the vibration would be through the steering
>> wheel and not the frame. No joy. My thought is that there is something in
>> the driveline causing the vibration, perhaps the rear brake drums worn
>> out of balance. The drive shaft was balanced 5 to 6 years back. Over the
>> years i've replaced all the universal joints. As far as I can tell the
>> rear drums are original to the car, as are the half shafts.
>> Before I start pulling the driveline apart I thought I see If anyone has
>> had a similar problem of a suggestion of where to go next. I'd appreciate
>> the input.
>> Bob
>> 72'TR6
>>
>>
>
>
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