[Main Performance Bulletin Board | BBFAQ | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos failure analysis Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Thu, 3 Jan 2002 16:36:46 In Reply to: Gear failure, Kevin K [Profile/Gallery] , Thu, 3 Jan 2002 14:09:00 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

of metals is an eng'g specialty. I work with 'em, and have done some myself. some thoughts on pics:

hardness would suggest strength level, for info only. inspection of roots/loose teeth would likely suggest fatigue. Wear pattern, rolled od edges, seems to imply gear spread, but should show on 2nd also.

the mainshaft gear seems to have been quite a bit offset to cluster mate, mabe some parts mixing induced axial misalignment? looks to be well before final failure.

best to have partial failure, like chris said. I had my virgin tranny torn down with slight pinion wine ... very good initial bearing wear read. 2nd gear mesh may shed some info in mike's case.

don't think hardfacing is an option, but new gearsets could be cryo'd for proven wear/toughness improvement, and peened for big fatigue improvement.

if oem supplier could be contacted (euro guys?) mabe some special sets could be made with current cnc programing, but stronger/harder gear alloys.

gearcase cracks are likely due to major internal failures, were stuff wedges together inside and motor/car inertial does the rest. could take an operable box to be rebuilt, and hand torque it with some dial indicators to check real flex at 250 ft-lbs ... likely linear flex for prediction at higher torque. may even read gear spread at 3rd mesh.



posted by 52.128.30....

• EricZ>> if i'm not making the power then how r u......., CookinSPG, Wed, 2 Jan 2002 23:32:42
  • Re: EricZ>> if i'm not making the power then how r u......., EricZ, Fri, 4 Jan 2002 18:58:51
  • Re: EricZ>> if i'm not making the power then how r u......., 85SLED, Wed, 2 Jan 2002 23:56:20
    • No, it's true, Jay Hassinger, Thu, 3 Jan 2002 08:19:13
      • Re: No, it's true (I know...I have two C900 that do!), 85SLED, Thu, 3 Jan 2002 12:01:29
        • Oh no, Jay Hassinger, Thu, 3 Jan 2002 12:59:26
        • i was wondering about that pinion reuse thing...n/m :), chrisx, Thu, 3 Jan 2002 12:05:03
          • more of a "not that you would", WASSAAB, Thu, 3 Jan 2002 12:29:20
            • Re: more of a "not that you would", Jay Hassinger, Thu, 3 Jan 2002 17:09:29
      • What is the point? (long), WASSAAB, Thu, 3 Jan 2002 10:13:57
        • Gear failure, Kevin K , Thu, 3 Jan 2002 14:09:00
          • failure analysis, Kevin K , Thu, 3 Jan 2002 16:36:46 <-- Viewing This Message
            • it appears 3rd has been and will be the weakest link, WASSAAB, Thu, 3 Jan 2002 16:58:40
          • ya really thinks it's broke...?, chrisx, Thu, 3 Jan 2002 15:01:27
          • Analyst?, WASSAAB, Thu, 3 Jan 2002 14:29:24
        • Is this to me?, Jay Hassinger, Thu, 3 Jan 2002 12:00:53
          • Not all of it!, WASSAAB, Thu, 3 Jan 2002 12:26:05
            • Oh I agree, Jay Hassinger, Thu, 3 Jan 2002 12:46:51
              • turbo upgrades, WASSAAB, Thu, 3 Jan 2002 13:34:52
                • Re: turbo upgrades, Jay Hassinger, Thu, 3 Jan 2002 17:04:18
                  • I've not experienced such a marked difference, WASSAAB, Fri, 4 Jan 2002 10:52:44
                    • Have you, Jay Hassinger, Fri, 4 Jan 2002 11:19:49
                      • Have fun, WASSAAB, Fri, 4 Jan 2002 13:38:50
          • i doubt it, chrisx, Thu, 3 Jan 2002 12:20:08
  • Re: EricZ>> if i'm not making the power then how r u......., Vince T, Wed, 2 Jan 2002 23:48:37

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