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Third gear problem - 915 - more questions
So,
I have torn down the 915 and am in the process of getting parts for the rebuild. I have not disassembled the input shaft itself yet. One thing that still nags me is to understand why I can't slide the 3/4 operating sleeve all the way into third.  From the image it is clear that the operating sleeve teeth are rounded and that there is some bad wear on the synchro band. But when I align the dog teeth with the (bad) operating sleeve teeth I would expect it to go into gear. Well. it does not. It seems to hit something and won't travel all the way. Could this be caused by the asymmetrical wear profile of the 3rd gear synchro band? From what I understand the operating sleeve is supposed to hug the synchro band and sort of compresses it a little bit in the process. Could there be more damage to the brake band - anchor block assembly that becomes obvious once the shaft is apart? I hope you guys I have talked to so far (John) don't mind my sounding like a broken record  Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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01-02-2003, 01:48 PM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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There are brake bands inside the synchro ring; as long as the operating sleeve and synchro ring are moving at different speeds these keep the synchro ring from collapsing and allowing the operating sleeve to slide over and engage the dogteeth. Wear of the dogteeth may have allowed parts to get out of position The brake bands, anchor block and thust block could be jammed and preventing the the synchro ring from collasping. Jim
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01-02-2003, 04:01 PM
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1974 Porsche 911 Targa 3.6
