|
|
|
|
| Author |
|
|
Registered
Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
|
915 box big clunk on 1-2 shift
If I shift my '83 SC carefully--which I'm only beginning to drive after a complete bottom-up rebuild of everything--meaning that I carefully put the clutch all the way in, then move the shifter, etc., it shifts perfectly. If I shift it lazily, the way you would a contemporary car, meaning you sort of simultaneously pull the shifter back as you put the clutch in, it "clunks" in the same way a car does when it jumps out of gear. Is this a 915 characteristic or does something need adjustment. Everything else on the rebuilt box works splendidly.
Stephan |
||
08-24-2001, 09:29 AM
|
|
|
Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,936
|
For the SC, if you have not yet set the clutch cable measurement under the 'box to the first 1.2, then 1.0 measurement, you need to do this. There is a small possibility that the clutch is not disengaging cleanly. Certainly if you have a new clutch cable in there you can expect some settling, etc., and thus a reset of this measurement.
Then there is the shifter coupling, the ball cup bushing under the shift lever, and of course the pedal assembly proper which may or may not need to be rebushed. I went about the "bad shifting 915" by starting at the pedal assembley, then the coupling bush/shift bush, then the clutch cable before finally giving in to worn synchros (i.e. least expensive to most expensive). Because of this, I have a very clean shift and virtually no problems. I think that performing all of this work (lots of time, but really only $150.00 for cable/bushes all around) makes the car much, much easier to shift and live with. Jw Edit: Meant to mention that a fresh horseshoe spring was put in as well; that was also in the $150.00 estimate. [This message has been edited by Jdub (edited 08-24-2001).] |
||
|
08-24-2001, 09:59 AM
|
|
|
GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
|
Are you new to the magic that is the 915 Stephan? They require a bit more slow and deliberate shifting than most boxes due to the Porsche synchromesh, which is not exactly the most user-friendly. Also, the 1-2 shift can produce a rather unpleasant "slam" or "thunk" when the synchro is shot, when shifted quickly. Maybe that is also the problem. Or you know all about the 915 and I'm dumbing this down too much...sorry -d ------------------ Dave '72 911T to '73 RSR Replica Project |
||
|
08-24-2001, 10:11 AM
|
|
