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  #1  
Old 11th July 2021
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Question Lefty bearing clearance?

I have not been able to find any info regarding clearance in the lefty bearing. I have a new one in the box and I measured the clearance at 0,0033”
It seems excessive compared to any non H-D bearing of that type and size I have worked with, and just moving the inner race radially gives out loud clicking from that clearance.

I find it strange that I cant find any info when basically all other bearing clearances are well defined by H-D.

Anyone who can help with the specs on that lefty bearing?
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Old 11th July 2021
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Can't say that I've ever heard of anything called a "lefty" bearing. A description of where it is & what it does may get you the info you're seeking.
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It is the left main bearing of the crank assembly. Also also called the sprocket bearing. The outer ring, rollers and roller cage is a subassembly of the INA brand. According to INA the inner race defines the bearing clearance class for that bearing. That inner ring is not necessarily made by INA.
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That bearing is pressed in.
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it helps to know what machine it goes on.
if it is what i am thinking about, the inner spacer determines the running clearance when pulled up to torque spec.
if it is .003, that is not excessive. a high speed bearing runs more clearance.
perhaps you need to look for crank axial play allowance.
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Thanks for the replies so far, but it seems I need to clarify that it is the current design with a cylindrical roller bearing. Not the previous double conical roller bearing design aka Timken.
As mentioned, this bearing is made by INA and the clearance I would like to know is the radial play within the bearing. Just let me know if further explanation is needed.
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ok
the bearing is setup like the ole iron mainshaft bearing on the sprocket side. you have diff size race and bearings to choose from and has to be fitted. the running clearance should be .0002>.0008
i could not find an end play number but i would recon it would be similar to the conical setup of .003>.010. since the shaft floats, the thrust washers control the movement but measured when torqued to spec with compensator attached.
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Old 12th July 2021
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Well I dont know how the Iron was made, but this does not have different races to choose from. There is only one parts number and the mounting instructions does not mention anything about selecting between different size parts. The inner race and the bearing comes as a kit.
That said the running clearance for the Iron seems right, but unfortunately far from the one H-D uses in this bearing.
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is this a conversion???
also what machine?? the 2017 as in the header??
24647-87
50
59
60

are bearing choices for the 2017

conversion kits have choices for inner race, outer race and bearings. not complicated but tedious measurements to get it close as possible, then fitting to running clearance. some cranks you have to change the stub shaft since the race is not changeable.
there is a lot of info on the net but mostly for BT.

as far as aftermarket, take everything with a grain of salt. it takes away the taste of finding out they do not know shinola.
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Thanks for the info. Yes it is a 2017, but I think you are referring to the pinion bearing for right side of the crank. It is available in several sizes as you say. My issue is the left bearing. It is like H-D completely forgot that bearing.
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