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B50 crank Q. #50293
11/30/06 12:50 pm
11/30/06 12:50 pm
Joined: Aug 2006
Posts: 8
R
Ristow Offline OP
BritBike Forum
Ristow  Offline OP
BritBike Forum
R
Joined: Aug 2006
Posts: 8
hello people! new guy here.

i hit a snag putting my B50 back together a while ago.i put the updated alpha bearing and carillo rod in it,and now the crank tightens up when i snug up the crankcase bolts.

as you B50 guys will know,there is a bearing spacer that goes on the drive side of the crank before it is offered into the case half.so the questions are,is (was) that spacer available in different thicknesses to allow proper endfloat with varying tolerances? i'm guessing the new bearing has slightly widen'd the crank,and my spacer is now too wide.

any thoughts will be appreciated!

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Re: B50 crank Q. #50294
11/30/06 1:27 pm
11/30/06 1:27 pm
Joined: Dec 2004
Posts: 9,332
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,332
Scotland
You need to have the faces on the side of the wheels where the bearing touches machined to give you back 3 to 5 thou end float. Before doing that however you need to ensure the new big end pin is seated correctly in the tapered holes in the flywheels. I would advise against thining the bearing spacer as this would move the whole crank to one side and the con-rod may not be central to the bore.

Re: B50 crank Q. #50295
11/30/06 2:49 pm
11/30/06 2:49 pm
Joined: Jan 2003
Posts: 191
california
james johnson Offline
BritBike Forum
james johnson  Offline
BritBike Forum
Joined: Jan 2003
Posts: 191
california
Ristow,

This seems like a common thing with Alpha Bearings. I have installed four Big ends to bikes over the last year and 1/2 and all of them have ended up like yours, so that should put your thoughts at ease regarding the growing big end.

on to making space.. have any spacers been placed between the main bearings and crank case? this is where I would start.... If not then I would start looking for another place to make space.. but as Kommando said in the preivous post, you need to make the space evenly between both sides so that the crank remains central.. 3 - 5 thou endplay should do it for the space.

james

Re: B50 crank Q. #50296
11/30/06 5:57 pm
11/30/06 5:57 pm
Joined: Aug 2006
Posts: 8
R
Ristow Offline OP
BritBike Forum
Ristow  Offline OP
BritBike Forum
R
Joined: Aug 2006
Posts: 8
thanks guys,i just talked to Frank Deihl,(he is a very nice man!)and am going to send it to him with the cases,and have him set it up.


Moderated by  Alan_nc 


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