Question about 2006 Triumph Tr 7

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1972 Triumph Spitfire, 3rd gear grinding

I have a 1972 Triumph Spitfire. I have just taken it on the road for the first time in 15 years, and now 3rd gear is difficult to engage, grinds. Double clutching will engage it. I rebuilt it 15 years ago, as it was missing a thrust washer and would pop out of 3rd, but I am wondering if this problem is again related? Perhaps it just has to be run to lubricate the gearbox properly to allow the synchro to do its job?
Thanks

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Jumping out of third was a common problem with the Spitfire quick changing up from forth gear would beat the syncro and chip the teeth on the drive dog then the bits would stop the syncro from engaging fully and it would jump out. If you replaced the syncro and the drive hub it may just be a bit stiff, the selector also wore quite quickly and misaligned the drive hub causing it to be hard to select.
I will scratch about in my very old manuals and see if I can find the spitfire gearbox manual, If I can I will post it.

Posted on Jul 30, 2009

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