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Registered
Join Date: Apr 2004
Posts: 3
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915 transmission linkage problems??
Hello transmission experts,
I had a rebuilt transmission installed in my 85 Carrera about two years ago. Recently it has started to make slight grinding sounds when shifting to second or third gear above 2500 rpm. Below this rpm all shifts are fine. It also tends to stick in fifth gear when trying to downshift. With the car parked and engine off, all gears shift well except fifth. It's a bit sticky and you can hear and feel a metal on metal rubbing sound when engaging it. The sound appears to be coming from right beneath the shifter. You can also hear a snapping sound when it's disengaged it from fifth. Am I experiencing a combination of internal (syncros) and external (linkage) problems or could this just be an issue with the linkage? |
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08-25-2004, 10:15 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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Why not start by inspecting the linkage a) the ball onthe bottom of the shifter, b) the coupling to the tranny. Both wear out. Both are easy to fix.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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08-25-2004, 10:18 AM
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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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101 Projects tells how to replace the bushings on linkage, not to hard. Read on the PP technical site for a slightly more helpful description on adusting the linkage.
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Hugh |
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08-25-2004, 12:30 PM
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Registered
Join Date: Nov 2002
Location: Planet Eugene
Posts: 4,346
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I would also do the linkage first. It is easier and cheaper to do that. Just be mentally prepared for the next step, which is to inspect the synchros.....
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08-25-2004, 01:36 PM
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Registered
Join Date: Nov 2003
Location: West of Seattle
Posts: 4,718
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The linkage bushings run like $26 from our host, and can be installed in a short afternoon of work. I inspected mine to discover that they weren't only brittle, but one was missing! I recommend you check yours before opening the tranny.
If you do have to open the tranny, you'll start with the easy stuff -- draining the fluid and looking for strange material or bits of metal, then opening the bottom access plate to poke around with your fingers for internal oddities. Seems like there ought to be another step before opening the tranny, though. Shift linkage alignment, maybe? Dan
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'86 911 (RIP March '05) '17 Subaru CrossTrek '99 911 (Adopt an unloved 996 from your local shelter today!) |
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08-25-2004, 01:40 PM
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Registered
Join Date: Nov 2002
Location: Planet Eugene
Posts: 4,346
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Seems like it. But.... "you can hear and feel a metal on metal rubbing sound when engaging it."
That is the sound of the coins in your pocket getting restless and rubbing their little selves together. Soon they will make a break for freedom and wind up in their new home in someone else's pocket.... |
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08-25-2004, 01:51 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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What brand and weight gear oil are you using in the 915 ... and has it been changed in the past two years???
Contaminated gear oil [wear products after rebuild] can cause difficulties with the 1 - 2 shift, and fresh gear oil can often cause the 'graunchy' shift to go away, and get smooth and quiet!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-25-2004, 02:26 PM
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19 years and 17k posts...
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How are your motor mounts? Mine were shot and when I replaced them my shifting smoothed considerably. Just a thought...
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Art Zasadny 1974 Porsche 911 Targa "Helga" (Sold, back home in Germany) Learning the bass guitar Driving Ford company cars now... www.ford.com |
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08-25-2004, 05:47 PM
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MazdaSpeed3
