'86 RX-7.
My rear subframe was rattling around with about 1/4" movement, so I tore it all apart. It has delrin bushings installed by the prior owner. The bushings have about a 23 mm hole at the top, tapering down to about 18 mm at the bottom. Problem is that the post that the bushing goes over is only about 18 mm at the top, tapering down to about 13+ mm at the bottom, thus the 1/4" movement.

My first thought was wear, so I checked the factory bushings on the subframe that came from my '88 parts car. Same dimensions as the delrin bushings. So now it looks like the post is the wrong diameter, but I can't believe that either. It doesn't appear worn, and both sides are the same dimension.

This is all very strange. What am I missing? It can't be that it's supposed to be that loose a fit, can it?

http://www.i2k.com/~mdoane/RearSubframePost.jpg
http://www.i2k.com/~mdoane/RearSubframeBushingTop.jpg
http://www.i2k.com/~mdoane/RearSubfr...hingBottom.jpg

Thanks,
Marty

 

possibly custom/cheater posts to allow 1/4" adjustment beyond stock for some bizarre/sneaky reason?