914-6 transmission rebuild, Can I reuse the 1st gear |
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914-6 transmission rebuild, Can I reuse the 1st gear |
914Gelb |
Feb 8 2012, 03:06 AM
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#1
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Member Group: Members Posts: 90 Joined: 7-July 11 From: Vienna Member No.: 13,288 Region Association: Austria |
Hello guys,
I've bought my car without any test drive because it was unsed many years. Now my transmission is on my todo list. I already opened the case to inspect the 1st gear. I saw a syncro ring which seems to be less used but the dog teeth and the slider speeks other words. My impression.. I have to change slider, dog teeth and syncro. I added some pictures, who can distinguish between poo parts and reusable ones. Attached thumbnail(s) |
Dr Evil |
Feb 9 2012, 12:39 PM
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#2
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Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
You can reuse teeth from other gears as long as you use all the internal parts with it (all the bands and blocks). I sell good used parts at a deep discount from new with no loss in longevity or function. You can also try Mittlemotor in Germany for new parts since you are over that way.
As for your question about the teeth points on the slider, the teeth need to be pointed so that they allow for the interlocking of the slider and the dog teeth on the gear. The synchroband works as both a friction devise that speeds up the gear to the shaft speed, and as a lock to hold the slider onto the dog teeth. When your teeth get dull, the slider and dog teeth have difficulty interlocking and this causes the grind you hear. A worn synchro band contributes to this. The reason the teeth need to be pointy is because the points offer less surface area to block the transition of the slider into its engaged position with the dog teeth of the free gear. The way the 901 type of transmission is designed, the parts tend to wear in this fashion: Synchro band -->dog teeth --> slider If one addresses the problem early, then they have less to fix. Also, the cost of the parts goes up significantly as the problem progresses and other parts wear: Synchro band (about $175) --> dog teeth (about $175) --> Slider (from $220 to $500) |
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