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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Gearbox issues
I have a stock 915 gearbox that will no longer shift into 3rd, 4th (or could be 1st and 2nd), 5th, or reverse.
It only moves in one plane. I am thinking bent shift forks?????????? I recall during my last few events it was getting hard to shift into reverse, but I don't recall that it was only shifting in one plane (This gearbox is in a race car that has been sitting for 5 years). Any ideas?? |
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RETIRED
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Hows the coupler in the tunnel look?
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Coupler was tight, no issues.
Thanks, AV8TOR |
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Registered User
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No shifting whilst car is idle or driving? Clutch operating ok? How is the shifter itself, is it sloppy at all?
Oil in gearbox?
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Goose- "nothing a year in the tropics wouldn't fix" |
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Registered
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With that particular problem I would check to see if the stubby end piece of the shift rod has come lose. It's just epoxied in and when it goes you get the issues like you describe.
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2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
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Registered
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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915
If all the bushings look OK, pull the shift pivot plate from the bottom of the box, they can pull the threads on the 3 stud fork and cause this
Mike Bruns JBRacing.com
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Thanks to all for responding........
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Registered
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+1 on this guy's advice.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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Registered
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Happened to me...... the nuts backed off the stationary fork and then it was stuck in 3rd gear. Tightened the 3 nuts and Loctite solved the problem.
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Thanks to everyone who contributed....
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Registered
Join Date: Oct 2003
Location: Central Fla
Posts: 1,864
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gearbox
Did you fix it ?
Mike
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The two most useless things to a driver are the braking distance behind you and nine-tenths of a second ago. |
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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I have not been to my shop since Saturday the 14th. I will be going there first thing tomorrow
morning. This gearbox is my first project to get done on the car. Cheers, Tom |
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Mike, opened the pivot plate access, fork and nuts still attached firmly onto the plate. I tried
tightening up the clutch cable and working the clutch a bit, it would shift into first and second but that was it (and then it was not easy to shift into either first or second). Track event this weekend, so I think at this point I am going to pull engine and gearbox, pull locked diff from bad gearbox and then install locked diff in another 915/41 i have in the shop, reinstall, drive this weekend. This car has a WEVO short shift, so I will pull the cover off of the tunnel just to make sure there is nothing jamming up the shift mechanism. Thanks again, and Cheers, Tom/AV8TOR |
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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any other ideas?????????
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AV8TOR
Join Date: Mar 2009
Location: Colorado Springs
Posts: 1,099
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Pulled the gearbox off the motor, turns out the round spring behind the throw-out bearing
had split in half, and was bouncing around inside the bell housing. When I looked down inside the bell housing (before splitting the motor and gearbox) I could see the spring ring lodged in the throw-out fork. There were scars from the ring bouncing around inside the bell housing, and on the outside of the clutch. I replaced the spring ring, and reattached clutch. Suspension work to do before motor goes back in. |
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