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TR4/4A 4A Syncro Tranny Question

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Tinkerman

Tinkerman

Darth Vader
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I am rebuilding a TR4A syncro box for my TR3. I was humming right along with the reassembly and ran into a snag. I installed the the bearing onto the input shaft or as they say in the manual, the "constant pinion shaft". Next was the bearing washer item M39, part number 60078. Am using the same one that came off the input shaft. Went to put the snap ring(new) on and there is not enough space for it. My question is did I not get that bearing seated well enough. The bearing is actually smaller in width by about .003 and the washer is right on with Nelson Riedel's measurments in his article. I did not use a shop press to put the bearing on the shaft. I used a large hammer and a metal tube of the right size.
My feeling is that there is some small amount of space left to go and the hammer and tube routine cannot get it, therefore I shold finish it with a shop press.

Any thoughts greatly appreciated.

Tinkerman
 

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Well, not likely to hurt anything if you try it in the press. But I'm guessing there is a problem hidden under there, and you'll wind up having to take it back apart anyway. Usually the transition between "still moving" and "solid" is pretty sharp, so I think it's unlikely you just didn't notice it was "still moving".

Did you put the oil slinger in there ?
 
A. It's not seated, hit it again. You can feel when it stops. B. You have the wrong washer, maybe mixed up with another one? C. Take the bearing off and measure the thickness of the inner race against the one you removed. D. I'll have to think somemore about it.
 
E. Does the inner race of the new bearing have a smaller radius on the inner bore than the old one has? If so it the radius could be interfering with the radius on the input shaft.
 
Yep Randall, the oil slinger is in there. The new bearings seem to be the same as the old bearings dimensionally speaking. Course the only dimension I checked was the thickness. I'm beginning to suspect that Randall is right that the problem lies under the bearing so I am probably going to take it apart. I checked the washer dimensions against the dimensione in Nelson Reidel's article and they were the same so I feel that I have the right washer. We are talking about .025 or .030 to go for the snap ring to fit. Tomorrow I will give seating it one more shot, if that doesn't work I will dissasemble it.
It is entirely possible that a bit of something got in there and is causing the problem.

Thanks, Tinkerman
 
Tinkerman,

Just in case you didn't know... the two transmissions TR3 and TR4 have different thicknesses of shims, spacers and bearings. If you use the TR3 in the TR4 then the stack would be .006 thicker perhaps not allowing the clip enough room to fit.
Hope this doesn't offend you. Larry (TFR)
 
No problem Larry, the TR3 is sitting on the side untouched. This is definatly the TR4 syncro I'm working on.

Thanks, Tinkerman
 
Still no idea on the clearance issue? Seems strange that it won't go onto the shaft enough to allow the fitment of the clip.
Wish I could be there to see the problem.
 
I'm about to dissasenble it, so that should give me the answer. Theory is. Hate dissasemblies, hate going backwards, so to speak. Seems to be seated though so taking it apart seems to be the only option.

More Later.

Tinkerman
 
Disasembly provided the answer! I used the old oil thrower and did not inspect it throughly (shame, shame). There were three little gouges in the washer which were more then enough to cause the problem. Sheech I hate to admit to being the cause problem but there it is. It is now ordered from TRF. One bright note is that it all came apart much easier than the original disasembly.

Anyhow thanks for your thoughts they helped, Tinkerman
 
Tinkerman said:
Sheech I hate to admit to being the cause problem but there it is. It is now ordered from TRF.
Click to expand...
At least you are doing the right thing by replacing it. There was a time I would have been in there trying to fix the old one; little Dremel work here, rubbing away with crocus cloth there ... took me a long time to learn it ain't worth it!
 
Yep, been there done that. Still have the crocus cloth though. In fact used it several time on this rebuild. Amazing to me that many folks don't know what crocus cloth is. Had to go out of town to get it. Went to an industrial supply house. Ah well..........

Cheers, Tinkerman
 
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