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gearbox main-shaft removal


daver clasper

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Hi everyone. I have a Mk 1, 2 litre Vitesse, fitted with a J Type Overdrive (possible Dolomite g/b shafts) I have stripped the g/b, except for the main shaft. I have no special tools so have tried the "Haynes" method, which is to remove the circlip which holds the bearing to the main shaft and also the large round clip which holds the bearing to the casing and then to tap the rear of main-shaft to push the m/s through the inner race into the g/b. This is just pushing the the bearing out of the casing. I have put the large clip back on and tried again (using a dead blow hammer with a soft face). It is not moving and I don't want to use too much force on the inner race, as will probably re use bearing as not old. Would heating the bearing using a decorators hot air gun help?, or any other tips as always much appreciated.
Cheers
Dave  

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I think you are trying to get the bearing off the mainshaft?

Removing the circlip from the shaft but leaving the snap ring on the outside of the bearing should allow you to bash the mainshaft through the bearing.  IIRC the shoulder the bearing sits on is fairly short so you don't have to move it that far.  This is not an ideal method if you want to re-use the bearing as it puts force across the rolling elements but your choices are very limited!

Heating the bearing inner race will help and I suspect using a copper or brass dift will also help by giving a sharper blow.  I used to have a thick walled, soft iron tube that fitted neatly over the overdrive bearing spigot so I could safely hit the end of the shaft.  I don't remember them being especially tight but it has been a while since I did one!

Nick

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