9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPics of failed pinion bearing race
Leading reported evidence
Use splines
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I learned that the 996 Turbo, GT3, and all previous Porsches used splines on the shaft that allowed the gears to slide on and off making repairs much easier.
Leading evidence: 'Use splines' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'boxster too) everything is pressed onto the shafts' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace these bearings require a complete teardown of the transmission' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
boxster too) everything is pressed onto the shafts
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
In this transmission (a probably the Boxster too) everything is pressed onto the shafts.
Replace these bearings require a complete teardown of the transmission
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Did replacing these bearings require a complete teardown of the transmission?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Do you know if the 2002 models use the exact same parts?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Seems strange they'd rely on a sealed unit rather than use the gear lube which would provide fresh lubrication.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I learned that the 996 Turbo, GT3, and all previous Porsches used splines on the shaft that allowed the gears to slide on and off making repairs much easier.
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Given this bearing is right at the pinion and is heavily loaded under acceleration, I'm confident the problem is fixed.
This is from a 2000 C2 coupe, 65k miles. Started making a whine about 10K miles ago and was getting worse and worse. Seems this bearing and the one on the input shaft are sealed and don't rely on the tranny fluid for lubrication like other Porsche models. Seems strange they'd rely on a sealed unit rather than use the gear lube which would provide fresh lubrication.
bearing_close0001.JPG
I have the same gear noise that you described in your other post. Did replacing these bearings require a complete teardown of the transmission? Also, did this completely solve the noisy "gear whine"?
...Rickker
It pretty much required a full teardown. I figured while it was this far, anything that's problematic should be looked at and replaced. So the 1st/2nd gear syncos were done. The spider gears on the diff were done since they were pitted.
As far as the results go, I'll let you know next weekend. A spirol pin that holds the spider gear shaft is on it's way from Germany and until that part arrives the diff can't be finished. Given this bearing is right at the pinion and is heavily loaded under acceleration, I'm confident the problem is fixed.
I read about this on Pelican.... some mentioned to take the seal off and let the oil lubricate it... so, did you do that or just put a new sealed one in.
Right now the seal is on. The tech doing the job made sure he greased it well before installation (synthetic). The failure itself doesn't appear to be lubricant related. My guess is that it was assembled improperly with too much preload given it has a pattern that matches the number of ***** in the bearing. Another interesting observation is that the spalling isn't even around the bearing. On one side it's really heavy and 180 degrees opposite, it's really light.
In this transmission (a probably the Boxster too) everything is pressed onto the shafts. I learned that the 996 Turbo, GT3, and all previous Porsches used splines on the shaft that allowed the gears to slide on and off making repairs much easier. This model requires a big press to get it apart.
Yup, it's now complete and now I can even hear myself think. Nice crisp shifts, smooth clutch. Just normal highway noises. Just in time for a nice fall drive tomorrow.
