4l60e input drum wore into sun shell ? pics added
11-19-2013, 12:03 AM
#1
4l60e input drum wore into sun shell ? pics added iam rebuilding my 4l60e and i noticed the input drum wore into the sun shell just slightly, i did have a bad 3/4 clutch failure, so could that failure take up the clearance there and cause them to come into contact? also the sun shell is the BEAST sun shell, any help is appciated thanks matt
Last edited by monte383sbc; 11-23-2013 at 12:14 PM.
11-19-2013, 09:52 AM
#2
Moderator
I cannot image how a 3/4 clutch failure could cause contact.
Are you sure there was contact? Post pics.
I have input drums that have what looks like fresh grinding marks, but they came out of working transmissions and they are not circular marks either.
If there was contact, you have seriously worn bushings.
There have been reports of The Beast being poorly balanced; I guess that could cause a bit of contact too. Many builders have now switched to the Sonnax Smart Shell which also reduces strain on the small inner bearing of the rear planetary.
Are you sure there was contact? Post pics.
I have input drums that have what looks like fresh grinding marks, but they came out of working transmissions and they are not circular marks either.
If there was contact, you have seriously worn bushings.
There have been reports of The Beast being poorly balanced; I guess that could cause a bit of contact too. Many builders have now switched to the Sonnax Smart Shell which also reduces strain on the small inner bearing of the rear planetary.
Trending Topics
11-23-2013, 12:33 PM
#8
Moderator
Oh - the input drum is bottoming out in the sun shell! Not good!
When you disassembled the input drum, did you notice the condition (or even existence) of the torrington bearing by the forward sprag?
I think it is #637 (Bearing assembly input sun gear) in the GM/ATSG diagrams.
Did you measure/estimate/feel how much end play the input shaft had before you opened the trans?
This has nothing to do with the 3-4 clutch.
To set end play, I assemble the input drum without the 3-4 clutch, install it with the pump (no reverse drum), measure end play and change the selective washer if needed. Then I install the 3-4 clutch perform the final assembly with the reverse drum.
When you disassembled the input drum, did you notice the condition (or even existence) of the torrington bearing by the forward sprag?
I think it is #637 (Bearing assembly input sun gear) in the GM/ATSG diagrams.
Did you measure/estimate/feel how much end play the input shaft had before you opened the trans?
This has nothing to do with the 3-4 clutch.
To set end play, I assemble the input drum without the 3-4 clutch, install it with the pump (no reverse drum), measure end play and change the selective washer if needed. Then I install the 3-4 clutch perform the final assembly with the reverse drum.
11-23-2013, 06:46 PM
#11
should there be a bearing between here ---->
<-- and here--> 
should there be a torington bearing in between the foward sprag and the front planets? or is the torington bearing thats in the front planitarys the bearing that keeps the foward sprag off the planitarys? if you understand what i mean?
<-- and here--> should there be a torington bearing in between the foward sprag and the front planets? or is the torington bearing thats in the front planitarys the bearing that keeps the foward sprag off the planitarys? if you understand what i mean?
11-23-2013, 07:45 PM
#13
Moderator
would # 235 be a bearing? here --> http://www.tehpear.com/pictures/othe...28large%29.jpg
i dont see a #637
i dont see a #637
But here it is during assembly:
See it in there:
11-23-2013, 07:53 PM
#14
Moderator
Other possibilities include:
The torrington bearing between the front planet carrier and the reaction shaft.
The thrust washer (or bearing) under the reaction shaft.
A completely worn torrington inside the front planet carrier.
The torrington bearing between the front planet carrier and the reaction shaft.
The thrust washer (or bearing) under the reaction shaft.
A completely worn torrington inside the front planet carrier.
11-23-2013, 09:19 PM
#15
i see, for sum reason i dont think i have that bearing when i dissembled the trans fml, well i just gunna order all new thrust washers and torington bearings, and go from there, ill get back to ya when i start the reassembly next week thank you so much for your time and help
11-26-2013, 09:04 PM
#17
had some time today to look at my trans and i belive my issue is in my front planetary. check these pics out.
in this picture ^...you can see the wear marks, now when i put the sun gar in the planets it does seat up against the torington bearing in the planetarys and spins smooth but it does have light contact as you can see from the pics...
in this picture ^...you can see the wear marks, now when i put the sun gar in the planets it does seat up against the torington bearing in the planetarys and spins smooth but it does have light contact as you can see from the pics...
11-27-2013, 12:55 AM
#18
Moderator
I just assembled the same parts you have in the photo using a 100,000+ mile 4-pinion planet, and I have a good .030 clearance between the parts; not even close to contact.
The sun gear snaps into the forward sprag assembly and it held by a sheet metal plate; that plate has a raised section which creates some space. In your pictures it looks like that raised section has been crushed. Here is what a good one looks like:
If the trans was last built with too little endplay, that raised section is probably the most crushable part.
The sun gear snaps into the forward sprag assembly and it held by a sheet metal plate; that plate has a raised section which creates some space. In your pictures it looks like that raised section has been crushed. Here is what a good one looks like:
If the trans was last built with too little endplay, that raised section is probably the most crushable part.
Last edited by mrvedit; 11-27-2013 at 01:01 AM.
