Hey Chaz,

My experience is that pinion bearing failure is a mileage and wear-related
failure, something all c900 5-speeds will eventually get. The bearing has
to endure very heavy axial loading under acceleration, and when wear or
additional crush of the crush sleeve gives produces a little play in the bearing,
you hear the characteristic whine as the pinion gear starts to move around on
the ring gear. It’s just the way it wears out. Keep driving with the whining and
eventually the movement will be enough to walk the pinion shaft around and
break a tooth and/or explode the bearing.

High power c900’s generally don’t last long enough to get the PB failure. They
break the gear teeth off second gear or third gear due to sheer torque and/or shaft
deflection, which has been discussed below. Another failure is to blow out the case
around the passenger side inner driver, because under acceleration the pass side driver
is being pushed out of the case. Sometimes it becomes free!

Jordan: I had an idea where you reinforce the c900 trans case like this:
cut the case in 3-4 sections, and between each section bolt in a "bulkhead"
piece, say 1/4" thick steel. It would look kind of like aircraft assembly
when it was done. But this would allow for strategic reinforcement and
very high strength. And a lot of gaskets and chances for leaks, too, but
whatever. Just something to think about.


posted by 65.78.13...

• What exactly causes the pinion bearing failures...., Chaz, Sat, 5 Feb 2005 17:12:22
  • designed for 120 hp engines., Kevin K , Mon, 7 Feb 2005 00:50:15
  • Re: problem with the question..., damien, Sun, 6 Feb 2005 20:15:46 <-- Viewing This Message
    • I had a similar idea..., Andy E, Sun, 6 Feb 2005 22:03:32
  • Temperature may be a factor >>>, BobD, Sat, 5 Feb 2005 21:06:05
  • Re: What exactly causes the pinion bearing failures...., BobS, Sat, 5 Feb 2005 18:50:19
    • Re: What exactly causes the pinion bearing failures...., Jordan, Sat, 5 Feb 2005 19:09:49
      • Re: Support bearing plate, BobS, Sun, 6 Feb 2005 09:09:22
        • Re: Support bearing plate, Jordan, Sun, 6 Feb 2005 09:48:08
      • one other thing is...., jak , Sat, 5 Feb 2005 19:33:44
        • Re: one other thing is...., Jordan, Sat, 5 Feb 2005 19:54:42
          • you would set the preload the same, jak , Sat, 5 Feb 2005 20:53:38
            • Re: you would set the preload the same, camm , Sun, 6 Feb 2005 20:49:25
              • Re: you would set the preload the same, jak , Sun, 6 Feb 2005 20:59:41
                • Re: you would set the preload the same, Camm , Sun, 6 Feb 2005 21:08:36
                  • There is a book, damien, Mon, 7 Feb 2005 08:09:29
                    • Re: There is a book - Awesome, Thank you. NM, Camm , Mon, 7 Feb 2005 14:38:36
                  • Re: you would set the preload the same, jak , Mon, 7 Feb 2005 06:38:36
                    • Re: you would set the preload the same, camm , Mon, 7 Feb 2005 07:08:03
                      • have you ever had a diff apart?, jak , Mon, 7 Feb 2005 07:42:25
                        • to be clear, jak , Mon, 7 Feb 2005 07:44:51
            • Re: preload, BobS, Sun, 6 Feb 2005 09:24:44
              • WOW. Lots of answers. Not a simple issue..., Chaz, Sun, 6 Feb 2005 09:37:08
                • Tranny Cooling, gorper, Sun, 6 Feb 2005 09:58:51
                  • What part # is the oil/trany cooler...., Chaz, Sun, 6 Feb 2005 10:09:38
                    • Re: What part # is the oil/trany cooler...., gorper, Sun, 6 Feb 2005 11:00:52
                      • Gorper, what is the location of the tranny cooler....., Chaz, Sun, 6 Feb 2005 14:06:04
                        • Re: Gorper, what is the location of the tranny cooler.., gorper, Sun, 6 Feb 2005 15:03:02
            • Re: you would set the preload the same, Trevor P, Sun, 6 Feb 2005 07:00:59

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• Prev by Date: I'm not 100% sure, but this is the right direction-, Andy E, Sun, 6 Feb 2005 20:06:09
• Next by Date: thanks man :-), jak, Sun, 6 Feb 2005 20:16:23
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