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TR4/4A Reversing upper fulcrum link

spbvmb

Member
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I have a late (1964) TR4 which has the upper fulcrum link installed with the curve away from the shock bolt and rubber bushing. The vertical link has a 3 degree caster and the upper wishbones are asymmetrical. It seems to be the general opinion that this upper fulcrum link is mounted backwards for this arrangement. When I reverse the fulcrum link it crowds the shock bolt to the extent that the rubber bushing will not fit over the bolt. Reversing this upper fulcrum also increases the positive camber which I am not sure is a good thing. I await your collective wisdom on how I should proceed.
Thanks for your ideas

Phil Brooks
 

TR3driver

Great Pumpkin - R.I.P
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Ah, good. Now you can test my theory that the fulcrum pin didn't get reversed until the TR4A. Park the car on a reasonably level hard surface, then hold a carpenter's square up to each front wheel in turn, with one leg resting on the ground and the other leg vertical at the wheel centerline. Measure from the carpenter's square to the edge of the wheel at the top and bottom. With a bit of math, that will tell you how close you are to the specified camber. Each 1/4 of difference is (roughly) 1 degree of camber.

Obviously, my theory is that your car is already correct and Mr. Williams is wrong.
 
OP
S

spbvmb

Member
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Randall,
Thanks for your response. I have already calculated the camber using a level with blocks attached to touch only the wheel edges top and bottom. The camber is positive 3 degrees or 3/4" in 15" which agrees with your 1 degree per 1/4". The spec is 2 degrees positive camber. I also made a jig with 2 pegs over which I placed the fulcrum and wishbone assembly and marked the ends of the wishbones. Reversing the fulcrum (curve toward shock bolt) adds 1/8" to assembly length and to positive camber. The outboard upper and lower wishbone vertical pivot spacing is about 10-1/4" which should add more than 1 degree to positive camber. The fact that with the fulcrum installed with outboard curve, the shock bolt can no longer be centered in the tower hole, is also of concern.
Phil
Phil
 

TR3driver

Great Pumpkin - R.I.P
Offline
Thanks for the info, Phil. Proof enough for me!
 
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