18-03-2018, 10:53 PM
(18-03-2018, 10:32 PM)Tony Press Wrote: This is always critical if the front angular contact bearings are the special narrow outer ring pair which must be mounted back to back.
An ordinary pair can be mounted either back to back or face to face.
The housing depth must be always checked in later crankcases to ensure the correct pair of bearings are fitted.
Cheers, Tony.
The "Companion" says they should be mounted so that the thicker outer rings are together - which is, I take it "back to back".
This is irrespective of the housing depth or the width of the outer rings. In regards to those I have the correct width bearings for the housing in the engine I have.
There is no preload on the bearings which is due, I take it, to wear. So I will introduce a 2.5 thou shim to add a bit of preload, which most people seem to think is a good idea.
Other sources say they should be installed with the faces marked "Thrust" together. The set that came out of the engine had "Thrust" on the inner rings, which was on the opposite side to the thicker part of the outer rings.
Which means, I think, that someone has already had these bearings out, and turned the middles round to get some more wear out of them.
So I am using another set that I don't think have been used as much. They are not marked "Thrust", so that confusion doesn't arise. Still need the preload, though, so either they are not a matched pair, or are a bit worn.
I am sure when re-assembled I will still have the "wobble".
Or maybe I will buy a Big Seven, then life will be so much easier!
Cheers
Simon