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1275 GT Crank
https://www.ausmini.com/forums/viewtopic.php?f=2&t=32946		 Page 1 of 1
Author:  mikkis37 [ Sun Jun 17, 2007 11:32 am ]
Post subject:  1275 GT Crank
Have directed another mini nut to the site and hoping they are going to join. They have a 1275 GT which they are restoring and a 1275 LS Hi-Ho silver which they got form Fowles Auctions. They are looking for a crank for the GT but have been told that the GT cranks are diferent from all the others. Is this so???? And if so what would be the best replacement?

Thanks.
Author:  simon k [ Sun Jun 17, 2007 12:18 pm ]
Post subject: 
on the GT crank - depends which engine it has. The early, and majority of them had Cooper S engines, which have a Cooper S crank, the grade of steel is different, but the dimensional difference is the centre main journal is thicker than a 'standard' 1275 (as sourced from an 1100S, 1275LS, A+ etc.). The later clubman GT's had the 1100S type motor. The way to tell is to look for tappet chest covers on the back of the motor.

If he needs to use a standard 1275 crank, he can put thicker thrust washers in it. I believe the thicker thrusts are hard to get, but it is do-able.

I don't know the details - I only know this much because I was looking at doing the same thing with my S motor and a standard crank

Best to give a mini specialist a call to discuss - Graham Russell certainly knows about them
Author:  drmini in aust [ Sun Jun 17, 2007 1:09 pm ]
Post subject: 
As Simon says the early ones were Mk2 S motors.
All the Oz Clubby GTs had small journal crank and Cooper S rods. The later ones had the small journal 1100S crank which is .032" wider on the centre main journal.
If putting a Mk2 S crank into a later block you would need approx .016" thinner thrust washers. This is what I run in my 1300 auto block with S crank. I take standard washers and have the steel backing surface ground to size.
If putting an 1100S crank into the early S type block you need them .016" thicker. +.030" ones are now NLA from Minispares etc but I believe ACL still can supply them. Or contact Graham Russell, he was going to get some made. Again, surface grind the backs to get the size you need. :wink:
Author:  mikkis37 [ Sun Jun 17, 2007 1:20 pm ]
Post subject: 
Thanks guys for the tips. I had already suggested Graham but thought I would check on here and see what the consensus would be.
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