A 518 Seperating rear clutch, driving shell. UPDATE 1
#386859
07/26/09 02:53 PM
07/26/09 02:53 PM
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MikeP
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https://board.moparts.org/ubbthreads/show...rue#Post5344236From this previous thread, John Kunkel thinks I have an issue with the Belleville spring (Piston spring in ATSG manual. Driving forward in Neutral and no Reverse is caused by a rear clutch that's not releasing, most common cause is a failed Belleville spring. I have the trans out and disassymbled. I can't remove the input shaft, rear clutch assymble from the Driving shell, Planetary gear train. The ATSG mentions nothing about the seperation, and my 727 video shows them just coming apart. ~6" down the input shaft, there is a bearing surface and just below that is a ~snap/ round ring in a grove that has a dog leg on it. For the life of me I can't get it out. So I gave up and posted Could it be that as John K stated, the rear clutch is hanging up and will not it allow it to seperate? With the output shaft in a hole in my bench, as I spin the driving shell, the rear clutch rotates in the opposite direction.....you can hear a slight drag of something in there. Any ideas appreciated. Thanks
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: MikeP]
#386860
07/26/09 05:33 PM
07/26/09 05:33 PM
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Posts: 25,890 Rio Linda, CA
John_Kunkel
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Most likely the clutch discs are hanging up, sometimes you can lift the transmission by the tailhousing and squarely slam it on the floor face down, the shock will usually dislodge them.
I've had some that wouldn't come apart, as a last resort I had to cut a hole in the driving shell to access the clutch pack snap ring.
The reverse rotation of the driving shell is normal.
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: John_Kunkel]
#386861
07/26/09 05:43 PM
07/26/09 05:43 PM
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MikeP
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John, how and what are they hanging up on? I may make an Aluminum clamp around the input shaft and press down on the shell. I tried holding the input shaft up off the bench and whacking the shell with a rubber mallet, and no luck. What is the little round ring with dog leg I described? Thanks 1000x for your help.!
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: MikeP]
#386862
07/26/09 08:30 PM
07/26/09 08:30 PM
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JohnRR
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Quote:
What is the little round ring with dog leg I described?
Thanks 1000x for your help.!
that is for the clip that holds the input shaft into the rear piston retainer , taking it out will not help you get it apart, just the input shaft will come out and it won't just come out .
the rear clutches , steels and the bellvue are fried and probably welded together , I assume you have the front drum off ?
good luck , it's not going to be easy , I had a front and rear clutch stuck together , I ended up breaking the input shaft out of the retainer , at that point I just pitched the rest of it in the scrap pile .
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: JohnRR]
#386867
07/27/09 05:40 AM
07/27/09 05:40 AM
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MikeP
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The input shaft is attached to the rear clutch assembly. The rear clutch assembly is inside of the Driving shell. The driving shell has the planetaries and output shaft.
The rear clutch assembly is stuck inside the driving shell.
I want to know what inside the rear clutch assembly is grabbing what in the driving shell.
I'll try to post a pic tonight, but there's not much to see beyond that description.
Thanks!
"Think Pink" 67'Dart GT vert, 69' Newport vert, 67' Barracuda
and a pile of trucks 78'79'91'92 CTD
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: MikeP]
#386869
07/27/09 03:38 PM
07/27/09 03:38 PM
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Posts: 25,890 Rio Linda, CA
John_Kunkel
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Was the rear clutch piston still in its bore?
A common failure is for a weak Belleville to allow the clutch piston to pop out of its bore and jam the discs, if this occurs the Belleville will usually look OK.
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: John_Kunkel]
#386870
07/27/09 09:19 PM
07/27/09 09:19 PM
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MikeP
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You know, I think it was out of it's bore.
The Belleville spring does have a fine wear line all around it ~1" from the outer edge.
Any other possible causes?
I have and 85' 727 that I just took apart.... The pieces look the same. Any noticable changes off the top of your head between 85' and 93' on the clutches and planetaries?
Thanks John!
"Think Pink" 67'Dart GT vert, 69' Newport vert, 67' Barracuda
and a pile of trucks 78'79'91'92 CTD
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Re: A 518 Seperating rear clutch out of driving shell.
[Re: MikeP]
#386871
07/28/09 03:40 PM
07/28/09 03:40 PM
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Posts: 25,890 Rio Linda, CA
John_Kunkel
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The wear line is normal where it contacts the pressure plate, I would recommend a brand new Belleville because any used one could be weak and.....deja vu.
'85 and '93 have the same output shaft spline, '94 and later is different.
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