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TR6 1973 Final drive issues

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R

Ribbs

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I dropped my final drive with the original intent of replacing the three stub axle and pinion oil seals but now I only seem to have succeeded in opening a can of worms. On the pinion oil seal, I thought I could follow the two simple steps outlined in the Bentley manual (51.20.01) of 'fit a new oil seal' and 'refit the drive flange'. But after the fact I see in the Moss Motors catalog where there were two types of pinion spacers used; a collapsible one and a solid one, used with shims, and that if you have the collapsible one and you loosen the pinion flange nut (which I have, to get to the seal) you're basically screwed, and will need to replace the ring/pinion with a solid spacer compatible type. That is definitely out of my comfort zone! Can I even tell which style spacer I have without removing the differential from the casing?

Second issue I'm running into on the stub axle seals; Once the stub axles were out of the housing, I had my local machine shop press off the bearings, so I could get the oil seals out. What I noticed on the right hand stub axle was some serious grinding on the shaft - I assume where the bearing sits (see picture). So I'm guessing that a previous bearing failed and caused the damage. So wouldn't they have had to move the replacement bearing outboard to avoid this area? And what is the proper location of the bearing on the shaft anyway? Also, various drawings of the stub axle show a raised shoulder that must be used to locate either the bearing or drive flange up against, but I see no sign of my stub axles having this feature.

Inner Axle Shaft.jpg
 
are the flanges still attached to the shaft,are both shafts this way grounded,it looks to me they ground the ridge thats a stop for the bearing not to go any further

the machine shop should take the flange off first,then you can get to your seal,and then you tap the bearing off,reverse the process putting it back together

Phil
 
Yes, flanges are still attached to the shaft. The right hand shaft is the only shaft ground down. However, the left hand shaft has no shoulder/ridge either and no sign that it ever had one, which makes me think that the ground down area on the right hand stub axle pictured is damage from a failed bearing, but how is anything located then (flange and bearing)? Also, there was nothing to prevent the bearings from coming off in the direction of the splines (opposite of the flanges).
 
The type of pinion shaft nut should provide a clue as the whether you have a solid or collapsible spacer.
Is yours a large 'Nyloc' or a large Castellated nut with a cotter pin ?
 
Oh crap Ken, I should have thought of that. I have a castellated nut - so I guess that means I have the collapsible? In which case I'm in over my head.
 
Not according to mine...castellated nut and a solid, non-colapsible spacer.
To me, this subject is one where the Haynes (Chapter 8 Rear Axle) is better than the Bentley....
 
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