 901 transaxle diff case bearing preload, Wondering if diff case is excessively hard to turn |
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| Buische |
 Mar 9 2021, 09:34 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 20-January 21 From: Peoria IL Member No.: 25,100 Region Association: Upper MidWest  |
I used Dr. Evil's video suite to tear apart and rebuild my 901 transaxle. Super good, but no discussion about what to expect for proper diff case rotation torque without 1-5 gear stack installed. I pulled the diff and put it in a plastic bag, cleaned the case, and put new seals in. I did not think to check when disassembling.
Diff is open type, side gears spin fine inside diff case. But when I twist both hubs in the same directlon, it takes a lot of effort. I'm guess-timating 30 ft-lb. I don't think this makes sense, but I don't actually know. I am concerned that a previous owner installed the diff wrong. But, the bearings don't have damage that I can see, so I don't have other evidence pointing to incorrect build. Any advice on how to tell if appropriate drag for bearings? Thanks |
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| stownsen914 |
Mar 10 2021, 03:27 PM
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Senior Member Group: Members Posts: 916 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I don't have the spec in front of me, but 30 ft lb is too high for sure (assuming it's just the diff in there, no pinion or mainshaft). It's usually measured in inch-lb (with only the diff carrier installed, no pinion or mainshaft). I recall for a 915 it's different depending on which brand of bearing you use, so it may be similar for the 901/914. If too tight, you remove shims from the diff carrier.
Edit - if you have the trans fully assembled including pinion + mainshaft assemblies, 30 ft-lb may be about right, though I've not measured it before to be honest. |
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| Buische |
Mar 11 2021, 01:23 PM
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#3
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Newbie Group: Members Posts: 4 Joined: 20-January 21 From: Peoria IL Member No.: 25,100 Region Association: Upper MidWest |
QUOTE(stownsen914 @ Mar 10 2021, 03:27 PM)  I don't have the spec in front of me, but 30 ft lb is too high for sure (assuming it's just the diff in there, no pinion or mainshaft). It's usually measured in inch-lb (with only the diff carrier installed, no pinion or mainshaft). I recall for a 915 it's different depending on which brand of bearing you use, so it may be similar for the 901/914. If too tight, you remove shims from the diff carrier. Edit - if you have the trans fully assembled including pinion + mainshaft assemblies, 30 ft-lb may be about right, though I've not measured it before to be honest. I initially had the 1-5 gearset and pinion installed, but took those out to be sure it wasn't due to interference with the pinion. There was some gray area in selecting intermediate plate gasket thickness, so wanted to be sure that was not a factor. |
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Posts in this topic
Buische 901 transaxle diff case bearing preload Mar 9 2021, 09:34 PM
mgphoto As per factory manual
Mar 10 2021, 03:35 PM Buische Very helpful info. Thanks. Mar 11 2021, 01:21 PM
Buische Good news. Went out and put my clicker torque wre... Mar 13 2021, 08:13 AM |
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