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[Fot] Beaten by equipment

Subject: [Fot] Beaten by equipment
From: fubog1 at aol.com (fubog1)
Date: Mon, 4 Jun 2018 07:58:45 -0400
 Yeah I would suspect driveshaft related, it looks like some funky harmonics 
were going on there... I'd be looking at that tailshaft housing real closely as 
well...
Glen

 

 

-----Original Message-----
From: barry rosenberg via Fot <fot at autox.team.net>
To: Mike Harmuth <ofracer at gmail.com>; FoTTriumph <fot at autox.team.net>
Sent: Mon, Jun 4, 2018 7:46 am
Subject: Re: [Fot] Beaten by equipment



Driveshaft u-joints caused this.


Barry



  
 
 
  
 From: Mike Harmuth via Fot <fot at autox.team.net>
 To: FoTTriumph <fot at autox.team.net> 
 Sent: Sunday, June 3, 2018 3:05 PM
 Subject: [Fot] Beaten by equipment
  
 



I had a new failure this weekend at Lime Rock with the Spitfire. 1st lap of the 
weekend, doing a sedate warm up around the track under full course yellow. When 
I start down the front straight and put it in 4th gear, there's a big vibration 
and ugly noises (short video attached). I was flat towed back to the paddock 
and when I took the tranny hump cover off, I found the shifter had snapped (see 
picture). A little more poking around and I discovered the aluminum bell 
housing was cracked from side to side and two bearing caps were missing from 
the tranny end of the driveshaft u joint (replaced over the winter).


I'm going to pull the tranny, driveshaft and diff to see what damage has been 
done. In the past, at the same spot at Lime Rock, I had a problem with the diff 
that 1st broke the tranny output housing. I didn't realize the problem was 
downstream, it locked up again (broken tooth inside floating around) and took 
out the rear  1/2 shaft u joints putting me in the wall.


After rewatching the video, many times, I suspect the broken shifter was the 
cause of the problem, (2 gears at once?) not a result but I'm pretty sure 
disassembly of the tranny will confirm this. My question is, has anyone had the 
shifter beak like this and if so, was it caused by something else or was it 
just metal fatigue? 



Other related info, new engine (1296) , more power than the old one, less than 
an hour on it. Zero track or dyno time, this was the 1st time the car saw 4th 
gear. All drivetrain fluids changed over the winter. No disassembly but cover 
off inspections and hand turning tranny and diff felt normal, last used in 
October 2017 with no issues, with old, worn out engine.


I will get this going for the K Cup, see you there.



thanks
mike h



?
?
 Front.mp4
?


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