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TR4/4A Answer to my post "help with tr4 transmission disassembly".

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J

John_Progess

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Well I finally got the cluster gear out. It looks like some PO did not install the rear cluster gear shaft bearing deep enough in the shaft. The rear most needle retaining ring with the lip to hold the needles was completely gone and what appears to be the outside cage of the bearing was left proud of the cluster gear by about 1/64" and this caught the inside of the thrust bearing and would not let it slide out. I had to pound down the proud lip and the thrust bearing finally slid out and the gear came right out. There still appears to be the outside of the needle bearing cage along with the forward needle retaining ring attached to it still inside the shaft. I will have to dig this out for the new bearing to fit. With the rear bearing retaining ring left proud of the shaft I don't see how the PO got this thing together! The thrust bearing was gouged out where the proud part of he bearing rubbed against it. Have a good day!

John
 
Bob,
I will try to get some close up pictures today before I proceed. If you will send me a PM with your email I will send them to you. Have a good day!

John
 
Here are some pictures of the cluster gear end, thrust washer, and needle bearing shell after I removed it from inside the shaft. IMG_2193.jpgIMG_2194.jpgIMG_2195.jpgIMG_2189.jpgIMG_2200.jpg
 
John-I would think that the bearing "walked" out after installation. Red loctite might be good insurance to prevent it from happening again. Is the bearing a tight fit in the cluster gear bore?
Berry
 
John_Progess said:
With the rear bearing retaining ring left proud of the shaft I don't see how the PO got this thing together! The thrust bearing was gouged out where the proud part of he bearing rubbed against it. Have a good day!

John
Click to expand...

Never underestimate what a shade tree mechanic with a hammer can make fit!
 
I had to drive out the bearing shell with a tool I made. It was tight! Is it normal to have to use lock tight when installing these bearings? Obviously I did something wrong when I inserted the images. Thanks for your response!

John
 
No need for locktite. There is no side force on the needles, so the cage will stay where you put it. The PM just did not "put it" right.
 
Normally, the shell bearing should be a press fit. The only scenario I can imagine that would require loctite, is if a cluster gear from a TR6 with a worn bore was fitted in a previous rebuild. Tr6s were fitted with open cage bearings, in which the bore of the cluster gear acts as the outer race. If the race becomes worn, it is common practice to fit the shell type bearing to salvage it. In which case, the fit could be loose and loctite might be used as a last resort.
Also, according to the shop manual, retaining rings&circlips were not used with the press fit shell bearings.
Sorry if I muddied the waters. I can't understand why the PO would fit the bearing proud of the gear.
Berry
 
John, thanks for posting the pictures! Gives us good insight on what to avoid when rebuilding a transmission.
Regards, Bob
 
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