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Newbie with gearbox mystery


milesmiles999
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I finally got round to removing the engine and box out of my Vitesse, to sort rattly bottom end mainly. Clutch looked shot so ordered a new kit. Clutch turned up and plate doesn't fit. Turns out the box is a KC serial numbered unit I think from a GT6, but the input shaft is 23 splines, which seems to make clutch plate replacement a bit of a mystery. A pic of the clutch plate I removed is attached. Everything I've read says including the workshop manual suggests number of splines should be 10! Any ideas? Cheers. Miles

GT6 clutch plate.jpg

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As they said, the Dolomite 1850 internals in a GT6 or Vitesse box has been a popular conversion for many years - my GT6 has one that I fitted in 1994 and my Vitesse has one the previous owner fitted in 1990. There are two benefits of the 1850 bits: it takes a J-type overdrive, which is stronger than the D-type, and the mainshaft tip bearing is bigger (and hence stronger) than the one that often fails on the original box. In fact, that was why my first Vitesse got such a conversion in 1989.

So, whatever John says about it not being original, it's possible that clutch plate has been in your car for thirty years!

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3 hours ago, JohnD said:

Gods, Miles, that is WORN!   Can't be original, so someone has been riding the clutch!

JOhn

Funny I was going to say it doesn't look very worn as you can still the original surface. Difficult to tell from a photo how far off the rivets it is but I know even a brand new plate doesn't have a lot of meat on it....

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There is a dimension in the manauls  , need to nip it firmly in a vice to compress the wavy disc   7.6mmm comes to mind

Diaphragm disc is thinner then a coil cover disc .at 8.3mm 

One reason why they cannot be mix and match, 

The wear in the photo look like its a bit dished ,  which can happen if overheated at some time 

Pete

 

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