[sker66]

Just bought my first 968.



Its tiptronic and i have a whining sound emitting from the transaxle, but the performance and function of the transaxle is fine. Its been to a few Porsche shops and no successful diagnose yet. I suspect a bearing may be going awry.



Anyone have or no who has had experience with this issue?? <img src="/forum/images/smilies/968/cool.gif" class="smilie" alt="" />



Who is the hotshot Tip Mechanic??

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[Darth Vadar]

Which year? Early cars seem more suseptible to pinion bearing failure.



How many miles? At what speed does the whine become noticeable?



Is it more pronounced when accelerating or coasting down?



Most Porsche shops should pick up on a failing pinion bearing right away...

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[gryphon]

I didn't know that Tiptronics had pinion bearings.



Tom

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[Darth Vadar]

Well, Tips have a ring gear and a pinion shaft, so I would think they have bearings holding the Pinion Shaft, just like the 6 speed...



See page 84 of the PET...



Yes, No, Maybe???

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[968rz]

Tiptronics DO have pinion bearings but it is the manual trans that have the problem with those.



We need more info about the sound. When does the sound start and what makes it change?

[color="#999900"]( I think I posted this in a different tread)[/color]

"Decel/accel - coasting in natural - going around curves - any gear/all gears"

I would think a wheel or torque tube bearing would be more likely, tips are rather bullet proof.

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[sker66]

[quote name='968rz' post='29499' date='Dec 30 2006, 03:36 PM']Tiptronics DO have pinion bearings but it is the manual trans that have the problem with those.



We need more info about the sound. When does the sound start and what makes it change?

[color="#999900"]( I think I posted this in a different tread)[/color]

"Decel/accel - coasting in natural - going around curves - any gear/all gears"

I would think a wheel or torque tube bearing would be more likely, tips are rather bullet proof.[/quote]





Thanks for the response guys.........It sounds like an alternator bearing whine and now that you mention it i had a 928 automatic that i had to replace the TT and i seem to remember a simaler noise .



I just took it up on the highway and whine is proportionate with engine speed parked ,in neitral,coasting,etc. does not get rid of it. The sound actualy sounds like its coming from both the tranny and engine compartment , but modtly from the tranny area. I will put it up on a lift tomorrow and use the screwdriver to ear trick to try to diagnose.



Any suggestions??????............ <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />



[quote name='sker66' post='29503' date='Dec 30 2006, 06:17 PM']Thanks for the response guys.........It sounds like an alternator bearing whine and now that you mention it i had a 928 automatic that i had to replace the TT and i seem to remember a simaler noise .



I just took it up on the highway and whine is proportionate with engine speed parked ,in neitral,coasting,etc. does not get rid of it. The sound actualy sounds like its coming from both the tranny and engine compartment , but modtly from the tranny area. I will put it up on a lift tomorrow and use the screwdriver to ear trick to try to diagnose.



Any suggestions??????............ <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />[/quote]



Its a 1995 with 111,000 miles

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[sker66]

[quote name='sker66' post='29503' date='Dec 30 2006, 06:19 PM']Thanks for the response guys.........It sounds like an alternator bearing whine and now that you mention it i had a 928 automatic that i had to replace the TT and i seem to remember a simaler noise .



I just took it up on the highway and whine is proportionate with engine speed parked ,in neitral,coasting,etc. does not get rid of it. The sound actualy sounds like its coming from both the tranny and engine compartment , but modtly from the tranny area. I will put it up on a lift tomorrow and use the screwdriver to ear trick to try to diagnose.



Any suggestions??????............ <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />

Its a 1995 with 111,000 miles[/quote]



Bill i just realized,when i looked at your website, that your a 968 guy also.

Let me get your input on this problem i'm haveing.





My best guess at this time is that I have either a rear most ttube bearing failing or its the converter bearings.

If i put the car up on a lift and running in park you can trace the whine with a screwdriver to ear to the loudest point which appears to be at the end of the TTUbe. If i put the scredriver at the bellhousing of the tip the noise doesn't transmit as much. I did have an auto 928 some years back and remember a simaler problem. I had my local Porsche mechanic diagnose a TTube and when he went to put in the new one it still had the problem. They took it all apart again just to find it was a bad converter bearing.

Has any of the TIP owners had experience with this, and what was the fix ?

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[968rz]

I have a tip but have not had any problems and from what I’ve read in all the forums they (tips) don't really have "common" problems. My educated guess (based on general automotive knowledge) I would say TT bearings; I think they can be replaced without replacing the whole unit and would be the cheaper of the two.

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[sker66]

[quote name='968rz' post='29908' date='Jan 15 2007, 10:20 AM']I have a tip but have not had any problems and from what I’ve read in all the forums they (tips) don't really have "common" problems. My educated guess (based on general automotive knowledge) I would say TT bearings; I think they can be replaced without replacing the whole unit and would be the cheaper of the two.[/quote]



My method in my previous post should lead me to what part is faulty. If it is the TT then its the rear bearing carrier as a lot of noise is transmitted thru the long screwdriver to ear test and fairly quiet in any other area of the TT.



Has anyone ever known of anyone changing out just the rear TT carrier bearing in the car?? If i could do this it shure would be alot less work.

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