Rear main bearing tolerances

[Chris KC]

At the very least I'd visually inspect the inner and outer races for any signs of fretting / brinelling/ corrosion; pretty much any mark that won't wipe off. I'd also check it is reasonably tight on the shaft. The question of how much slop is OK is not easy to answer, if you can genuinely measure it it's probably too much, I wonder how accurate that set-up really is though. One of our 'cherished suppliers' can sort you out with a new bearing if required, preferably one from a well known and respected maker.

My suggestion would be try and figure out what was making all the noise before going much further - if you can describe the noise and the conditions under which it occurred I'm sure many folks here will venture educated guesses.