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Author Topic: crank to tight in cases  (Read 422 times)

devon john

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crank to tight in cases
« on: December 28, 2014, 09:07:49 AM »
i was going to try and get the bullet back together over the holiday ,
but have had a few problems , fitting the crank the bearing on the drive side was very very tight .
i pressed it on using spacers and the drive nut .
then when trying to bolt up there seemed to be a problem it would not spin when tightened.
i have had a devil of a job trying to part the drive side case off .
the only thing i can see is on the drive side the ball race, spacer then the inner roller bearing seems tobe proud of the out race ,,,, if that makes sense ,
should it be flush , a nd is there different spacers ??
help!!!!

john
harley Dyna 1550
harley FLH 80
535 Royal Enfield bullet

ace.cafe

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Re: crank to tight in cases
« Reply #1 on: December 28, 2014, 09:55:59 AM »
Did you heat the cases enough before removing/ installing the bearings? Did you heat the inner races of the main roller bearings to get them to slide all the way on to the shafts?
Did you use new thrust washers?
are the shafts straight?

cafeman

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Re: crank to tight in cases
« Reply #2 on: December 28, 2014, 02:42:37 PM »
This is how I checked (the pictures) to ensure "all bearings" were properly seated when I installed them. The drive side ball race should be against the snap ring as shown. The roller bearings should be "Flush" on the inside in both cases. If the drive roller isn't, either the drive ball bearing isn't all the way against the snap ring and along with the spacer, will cause the roller inner race to stick out further than the roller outer race.  One or both of the drive side bearings are not seated properly would be my best guess, or wrong sized/incorrect parts as a long shot?
Installed the bearings in the cases. Heated each case (one at a time) in the oven set at 300 degrees for about 10 minutes each (they didn't actually reach that temp) and stuck the bearings in the freezer. Then popped them in their bores till fully seated, gently tapped and drifted to make sure they were parallel with the flats for sure, as well as checked the ball bearing to ensure it too was parallel with a dial caliper.  Installing crank and bolting up the cases, checking everything for flat cylinder base, smooth rotation, ensure there will be no leaks etc is next.  :)

« Last Edit: December 28, 2014, 02:44:51 PM by cafeman »
Current Fleet: 2001 Royal Enfield Bullet 500 Cafe Racer
                     1996 Yamaha Seca II
                     1991 Husqvarna 350WXE
                     1991 KTM 250MX
                     2004 Husqvarna TC450

cafeman

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Re: crank to tight in cases
« Reply #3 on: December 28, 2014, 02:48:20 PM »
i was going to try and get the bullet back together over the holiday ,
but have had a few problems , fitting the crank the bearing on the drive side was very very tight .
i pressed it on using spacers and the drive nut .
then when trying to bolt up there seemed to be a problem it would not spin when tightened.
i have had a devil of a job trying to part the drive side case off .
the only thing i can see is on the drive side the ball race, spacer then the inner roller bearing seems tobe proud of the out race ,,,, if that makes sense ,
should it be flush , a nd is there different spacers ??
help!!!!

john

What Ace mentions (heating the cases) as well as freezing the bearings would be considered mandatory to install them easily. They went in smooth and easy for me using that method.
Current Fleet: 2001 Royal Enfield Bullet 500 Cafe Racer
                     1996 Yamaha Seca II
                     1991 Husqvarna 350WXE
                     1991 KTM 250MX
                     2004 Husqvarna TC450

devon john

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Re: crank to tight in cases
« Reply #4 on: January 02, 2015, 06:28:31 PM »
the parts are with Mike a friend of mine , a aircraft engineer ,
his verdict is that there was a massive difference in the size of the shaft and the bearing.
over 3 thousands he has honed the bearing to fit as it should , the new crank is true to 1/2 thou.
this has been a night mare for me as after all thats gone on i thought the problems were be hide me.
just waiting for a gasket and oil seal plus another new main bearing.
lets hope the new year will be a little kinder !!! :D
happy new year to everyone across the pond,
john
harley Dyna 1550
harley FLH 80
535 Royal Enfield bullet

devon john

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Re: crank to tight in cases
« Reply #5 on: January 21, 2015, 03:37:13 PM »
the bike is a live , running sweet  ;D

MOT this weekend then do a few miles .

john
harley Dyna 1550
harley FLH 80
535 Royal Enfield bullet

cafeman

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Re: crank to tight in cases
« Reply #6 on: January 21, 2015, 03:51:37 PM »
Happy Endings are nice!  :)
Current Fleet: 2001 Royal Enfield Bullet 500 Cafe Racer
                     1996 Yamaha Seca II
                     1991 Husqvarna 350WXE
                     1991 KTM 250MX
                     2004 Husqvarna TC450

devon john

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Re: crank to tight in cases
« Reply #7 on: February 13, 2015, 07:54:31 PM »
did 600mls the weekend up to the Dragon Rally .

the bike is running sweet and now pulling really well .

john
harley Dyna 1550
harley FLH 80
535 Royal Enfield bullet

ace.cafe

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Re: crank to tight in cases
« Reply #8 on: February 13, 2015, 08:47:18 PM »
Congratulations!
 :)