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torque tube bearings replaced now can't turn the drive shaft easily

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torque tube bearings replaced now can't turn the drive shaft easily

 
Old 03-21-2019, 11:52 AM
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SRaouf
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Default torque tube bearings replaced now can't turn the drive shaft easily

Hello
as part of my restoration I replaced the torque tube bearings and oil pump seals on my transmission. after putting it back together I now find the drive shaft quite stiff and cannot turn it by hand, which I used to be able to do before. Is this normal after a rebuild? I did lubricate the bushing for the torque converter before refitting

Thanks
sam
85 S2 auto
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Old 03-21-2019, 12:32 PM
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76FJ55
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NO this is not normal. you need to figure out where is it binding. I would disconnect the TT from the TC housing input and see if the TC input turns freely and that the TT turns freely on its own also. after installing the TC on the trans and installing the front TC housing did the trans still rotate freely? my first guess is that you didn't get the TC aligned correctly and put it in a bind when you tightened the TC housing bolts.
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Old 03-21-2019, 12:35 PM
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Thanks thats what I suspected. I'm taking it all apart again now. Id rather do it twice now than discover a problem after I fit it back on the car!
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Old 03-21-2019, 12:40 PM
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spot on. TC binding.
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Old 03-21-2019, 12:55 PM
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You need to ensure that the converter is properly seated in to the pump before you put the bell housing on. Sometimes this can be real tricky but if you don't, you will shred your pump and then you basically have a useless transmission. Take a look at the WSM.
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Old 03-21-2019, 01:51 PM
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The good news is now I know what the slots on the TC input shaft are for. The bad news is that with the 928 I have to finally admit ive reached my level of incompetance.




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Old 03-21-2019, 02:28 PM
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Well that sucks. Maybe try 928 international and see if they've got a serviceable front pump assembly.
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Old 03-22-2019, 11:25 AM
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Ive tracked down a few here in the UK. they run at about £140 ish ($180) used so need to decide whether to buy one or just buy an entire transmission assembly for twice as much and strip the parts
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Old 03-22-2019, 05:46 PM
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Anybody got a pic of what the broken part should look like?

I took a look in PET but could not see the specific part so presume it is a part component - presumably of the pump
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Old 03-22-2019, 05:56 PM
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Thats correct. Only sold as part of a complete pump part number 1262770320 £££ here is how it should look with the two teeth on the inner circumference. These have snapped off on mine.. The 2 slots in the TC shaft fit on the two teeth. when aligned correctly




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Old 03-22-2019, 06:43 PM
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Thought that would be the case- obviously the drive dogs for the oil pump have sheared off. I wonder if they could be welded back on given the drive load is not all that high for a pump like that. I suppose the problem may be getting someone to do a quality job for a price significantly less than the options available to you.
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Old 03-22-2019, 08:32 PM
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Originally Posted by SRaouf View Post
The good news is now I know what the slots on the TC input shaft are for. The bad news is that with the 928 I have to finally admit ive reached my level of incompetance.


Amazingly common mistake. for first timers:
No one person ever makes this mistake a second time.....

To save you a second "round" of grief, make sure that you lube the hell out of the bronze bushing right between the converter seal and the oil pump gears.....people forget to do that and the torque converter seizes on the bushing, which ruins both the pump and the converter...instantly.
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Old 03-22-2019, 08:39 PM
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Originally Posted by GregBBRD View Post
Amazingly common mistake. for first timers:
No one person ever makes this mistake a second time.....

To save you a second "round" of grief, make sure that you lube the hell out of the bronze bushing right between the converter seal and the oil pump gears.....people forget to do that and the torque converter seizes on the bushing, which ruins both the pump and the converter...instantly.
will do. At least I didn’t discover this AFTER refitting the tranny!
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Old 03-23-2019, 01:26 PM
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Not that Im now paranoid or anything but could someone please confirm Ive installed this needle bearing the right side up? thanks
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Old 03-23-2019, 04:29 PM
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Originally Posted by SRaouf View Post

Not that Im now paranoid or anything but could someone please confirm Ive installed this needle bearing the right side up? thanks
Not sure it matters....
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