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Uncertifiable!!!
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Whining 915 Trani
My trani has a momentary low rpm rattle if I lug the motor in any gear which turns into a whine at higher speeds and very high pitch at cruising. Whine not gear dependent. Shifts like butter. Can’t say that the whine is getting worse- may have always been there. Swepco oil to middle plug on driver’s side.
Trani was refurbished a couple of years ago by a knowledgeable strictly Porsche indi shop more as a perceived precaution as it already had 400k+ km (250k+ miles) and more than 10 DE track seasons. Work done: (1) replaced synchros and dog teeth for gears 1,2,3 and sliders for 1-2 and 3-4 with all OEM parts (2) one surprise was the retaining bolt for the shifter detents pulled from the case so Yarko had to drill and timesert the case (3) replaced the 5 needle bearing cages under each gear that fell apart when gears removed - replaced with OEM new. I don’t know much about transmissions but maybe it’s time for me to venture directly into the matter. Any thoughts and suggestions would be welcomed. TIA Cheers, Johan
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Living well is life's best revenge- George Herbert (1593-1633) ‘71 911T resto, 2006 C2S, A4 Quattro, the RST long hood hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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Registered
Join Date: Jan 2015
Location: Stow, MA
Posts: 390
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Looks like the bearings were not done. That could be your problem.
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Kevin Catellus Engineering catelluseng@gmail.com http://www.catellusengineering.com https://www.facebook.com/catelluseng/ |
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Uncertifiable!!!
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Quote:
![]() Which ones? Johan
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Living well is life's best revenge- George Herbert (1593-1633) ‘71 911T resto, 2006 C2S, A4 Quattro, the RST long hood hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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Under the radar
Join Date: May 2007
Location: Sebastopol, the land of wine and redwoods in The Republic of California.
Posts: 6,848
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On your turbo?
![]() My first guess is a worn 5th gear set. But you say it is not gear dependent. Could be ring and pinion. Were those bearings replaced and was the backlash and preload checked?
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 19,603
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I would guess pinion bearing in the diff housing, possible loose pinion bearing outer race in the diff housing, bearing retainer plate worn so the bearing(s) have end play, maybe even worn R&P from above issues. Teardown and see.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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Quote:
Porsche 915 Rebuild - One Piece Bearing Retainer Plate Keep in mind, for those that don't know, - Johan now has probably close to half a million KM on this 915, with a healthy boosted motor feeding it as much torque as it can swallow..... so it doesn't owe him much!!
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87 Coupe - The Driver 78 Backdate - The Project http://forums.pelicanparts.com/porsche-911-technical-forum/979976-project-heavy-metal-all-steel-classic-remastered.html 85 Coupe - The Rot Rod! AX beater |
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This happened to me years ago on a VW Vanagon. I tuned up
My radio and that worked for a few more thousand miles! But then. Went to shop for ring and pinion. |
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Registered
Join Date: Jan 2015
Location: Stow, MA
Posts: 390
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I'm not a fan of doing "some" of the bearings. Some previous did "some" of the rebuild, and here you are today. Just do them all: do it once, do it right.
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Kevin Catellus Engineering catelluseng@gmail.com http://www.catellusengineering.com https://www.facebook.com/catelluseng/ |
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Uncertifiable!!!
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Well, thank you all for your valued analysis and suggestions. Looks like the consensus is bearings and ring/pinion.
Seeing my winter project list is not that long this year, I have the time to educate myself and tackle the rebuild. Never done this before so I have some reading to do. I plan to drop the Powertrain on the RST in January and will post my progress on this thread. I’m sure that I’ll be soliciting your collective help from time to time. Cheers, Johan
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Living well is life's best revenge- George Herbert (1593-1633) ‘71 911T resto, 2006 C2S, A4 Quattro, the RST long hood hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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gearhead
Join Date: Nov 2007
Location: Loverland, CO
Posts: 19,747
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The way to avoid the cost of a ring and pinion is to stop driving it and do the bearings now.
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1974 911 Restorod 1974 914 Bumble Bee 2004 40 Jahre 2008 Cayman S Mule |
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Quote:
Transmissions are fun, and easy, to work on. Well, relatively, at least. I'm sure you've seen peter zimmermans tutorial, it's a good place to start, and Gordo (or is it Gordo2?) has a few excellent threads as well. Given that you may have to send out the diff housing for repair, the sooner you can tear into it, the better. Things have a habit of dragging out, and if it takes 4 or 5 weeks (return) for that, it may end up cutting into your spring driving time.
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87 Coupe - The Driver 78 Backdate - The Project http://forums.pelicanparts.com/porsche-911-technical-forum/979976-project-heavy-metal-all-steel-classic-remastered.html 85 Coupe - The Rot Rod! AX beater |
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Uncertifiable!!!
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Quote:
I need a new challenge so I’m starting my tutorials per your suggestions. You have an excellent point on timing and possible repair to the diff housing. Got to finish lowering the 997S right away. Cheers, Johan
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Living well is life's best revenge- George Herbert (1593-1633) ‘71 911T resto, 2006 C2S, A4 Quattro, the RST long hood hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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Uncertifiable!!!
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Update!!!!
Well, Jonny042’s handy toolS came to the rescue. Thank you Jon. Partially dismantled the transmission and differential, but could not find anything amiss. Replace all seals and gaskets. The whining, as best as I could diagnose, was a very noisy release bearing which I have now replaced. Cheers, Johan
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Living well is life's best revenge- George Herbert (1593-1633) ‘71 911T resto, 2006 C2S, A4 Quattro, the RST long hood hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html |
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Registered
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Whew! Sounds like you got lucky...
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Join Date: Jun 2000
Location: bottom left corner of the world
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Excellent outcome.
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