Saturday, June 24, 2006

Do the shimmy?

I have always had a wheel shimmy problem on the TR but with the addition of the uprated front brakes it is even more noticable.


My mate Kevin is determined to sort this problem out so he came over today with some shims - this is what shims look like nowadays apparently! Sheets of plastic in different thicknesses that you cut with a pair of sciscors - what is the world coming too?


Anyway, we jacked the TR up, removed the wheels and put a dial gauge on the discs. Only 1 thou out on the offside but 7 thou out on the nearside.

That doesn't sound enough to make a difference but we went to work on the nearside. This involved removing the disc and fitting shims between the hub and disc - several times!

We got the run-out down to 4 thou and then reassembled it all for a test drive - no difference.

We really thought that 4 thou wouldn't matter anyway so now we were stumped.

Half and hour after Kevin left he called me back - he has been informed by a chief techie at a rally team that 4 thou will definitely give a problem.

Next step is to remove the whole assembly and then it goes into Kevin's machine shop (he is a director of an engineering company) to be trued up on a rather expensive lathe - then we'll see what difference that makes.

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