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Old 11-06-07, 05:14 AM   #12 (permalink)
RamboLambo
A Tenth
New Zealand
 
Join Date: Feb 2002
Location: Whangarei NZ
GT40: Whangarei New Z
Posts: 185
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Re: UN1 13 gearbox prime shaft upgrade

Quote:
Originally Posted by Fred/GT40 View Post
Folks,

Connection part between prime shaft and secondary (to the engine) went bust.
Chris Cole helped me out to understand the issue.

Thanks for your expertise and ongoing support.


Rgds
Fred
Ahhh thats the dreaded splined sleeve. Yes, this wee peice of French ingenuity has only about 1/3 of the splines actually cut in it. It is designed to fail before anything else in the engine (in theory). And while Im speaking about theories, this 'sleeve' allows the primary shaft to 'flex' in extreme conditions, eg: the primary shaft is supported in 2 bearings and 2nd gear breakage is where the shaft flexs in the middle so the gearteeth ride up and break off. The 1-peice shaft more-or-less makes this a 3 bearing shaft as any flexing is now resisted by the crankshaft bearing.
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Bruce
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