5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAxle flange problem
Leading reported evidence
Install spring clip
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Read evidence and context
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Performed · outcome unconfirmed · Original poster
This time I didn�t replace the seal, but installed a new spring clip.
Leading evidence: 'Install spring clip' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust "' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
I used a bottle jack to make sure the flange was fully pressed into the diff.
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Suggestion
The axle has to be able to "adjust" for length during suspension travel arc.
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Suggestion · Original poster
This time I didn�t replace the seal, but installed a new spring clip.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
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I�ve been fighting an oil leak problem coming from the transmission output shaft seal (driver side). This is a dedicated track car. There was no leakage for the previous couple of years, but early this year it started leaking badly.
I assumed it was a worn seal and replaced it.
In this trans, the output shaft/axle flange is retained in the differential by a spring clip on the inner end (no center bolt). The service manual says to replace this clip with every R&R but I didn�t, and apparently shops don�t routinely replace them either.
During the next track event, it started leaking again. This time I noticed the flange had moved outward by at least a � inch. Since the machined shoulder that the seal rides on is only about 3/8� wide, this doesn�t leave much left for the seal to ride on, so it leaks.
This time I didn�t replace the seal, but installed a new spring clip. I used a bottle jack to make sure the flange was fully pressed into the diff. (I�m doing this with the trans in the car, not on the bench).
Another couple of track days and it started to drip and sure enough, the flange had move out again. I pressed it back in and it lasted 2 run sessions.
Here�s a photo of the gap between the flange and the trans. You can see the flange shaft has moved out of the diff by about � inch.
Has anyone experienced this before? Any suggestions?
1/4" gap
Shot in the dark thought. The axle has to be able to "adjust" for length during suspension travel arc. Have you serviced the inner cv joint? If it is a little dry or worn it might be working the flange out instead of accommodating length variations.
http://www.auto-repair-help.com/auto.../cv_joints.php
"The axle shaft generally uses two CV joints. The CV joint that is placed on the wheel side of the axle shaft is referred to as the outboard CV joint. The CV joint placed on the transmission side of the axle shaft is referred to as the inboard CV joint. The outboard CV joint is designed to swivel as the wheel is turned while steering.
The inboard CV joint is designed to extend or retract as the vehicle suspension moves
. For this reason, the inboard CV joint is sometimes referred to as the plunge joint."
I did check that the axle slides laterally through the CV. It seems to slide freely, but maybe it binds under load.?
I do think you're on to something though. In doing some more internets googling, I found a statement in a BMW forum that implied a bad inner CV could cause the axle flange to pull out, especially if it has a weak spring clip. So apparently BMW has a similar setup.
I have another axle/CV assembly, so that's going in. Plus a new spring clip.
Thanks!
Jon.
Problem solved. One thing I didn't originally mention was that this car has a Quaife differential. I contacted them to see if anyone else had this problem and they said No, not if the axle flange was modified properly. Huh?
Turns out that the shop that installed the diff didn't chamfer the end of the axle flange like they were supposed to. This allows it to go into the diff a few more mms, at which point the spring clip clearly snaps into place. All fixed.
