From: Greg [email protected]
Date: 08 Mar 2001
Time: 12:56:11
Remote Name: 203.1.72.96
Ok, lets get this thing up to speed, the latest is. According to the large red book, (workshop manual), the story goes like this.
The large axle diffs were made for the Big Seven, whilst still making the Seven. Therefore some of the last Sevens were fitted with this back end.
As far as I can ascertain there appears to be the same setup in these as the Seven. I have had the backend out again my man has redone the entire job, looking at the same time for a possible problem.
He found nothing out of the ordinary, by the way he did replace the angular contact bearings with some modern Timken Tapered Rollers. To do this there is a small amount of maching to be done, as the new bearings are slightly thicker than the originals, easy enough done. The numbers of these bearings are Timken 28137 and the outers 28300.
Anyway, back to the noise, it is still there. I pondered on the following, there is some wear in the crown wheel and pinion, after all it is 60 odd years old. I am only 44 and I am worn!
Geoff, my engineer, set up the backlash at the correct setting, eg 1.6 mm @ 7 inches. Now, the only reason I redid the backend was an oil leak on one side, and a buggered bearing in the front of the torque tube. The thing was not making any noise apart from bearing rumbling and this could be fixed for about 50 miles by filling it with grease via the grease nipple on top of the front mount.
My thoughts now are, now that all is new in the bearing department, that the mesh has changed, and this is my noise. In fact, as a trial, I loosened the backlash towards where it was and the noise did ease up! I may end up with it back out where it was, but I will do some miles first to see how it settles in!
Thanks for your input, and keep up the Austineering.
Regards Greg