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Pinion Gear not a slip fit

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markrob

Posts: 7

Joined: Sun Sep 13, 2009 12:16 pm

Post Thu Feb 16, 2012 10:32 am

Pinion Gear not a slip fit

The pinion gear for my WLA is definitely not a "slip fit" right now...the spiral gear slips on nicely, but the pinion gear, after polishing up both the pinion gear and the shaft, is a press fit. The binding area appears to be where the larger spline on the shaft contacts the pinion gear I.D.

Any thoughts on what could have caused this, and how to get around it? Not sure if I should look to get a new pinion gear, try to grind the existing one down just a tad, or what.

Thanks,

markrob
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RUBONE

Posts: 381

Joined: Fri Nov 30, 2007 7:24 pm

Post Thu Feb 16, 2012 11:31 am

Re: Pinion Gear not a slip fit

You are lucky. The best fit for a pinion is tight, not slip. The looser the slip the more noise it makes and adds to variations in timing due to lash. Keep it tight!
JMHO
Robbie
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markrob

Posts: 7

Joined: Sun Sep 13, 2009 12:16 pm

Post Thu Feb 16, 2012 1:24 pm

Re: Pinion Gear not a slip fit

Robbie,

Thanks for the input. I guess I was concerned that it is supposed to be spring loaded to press back against a bushing in the side cover or something similar. As tight as it is now, I'd need a heck of a spring to move it on the shaft... I'm learning as I go on this one...

markrob
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RUBONE

Posts: 381

Joined: Fri Nov 30, 2007 7:24 pm

Post Thu Feb 16, 2012 10:36 pm

Re: Pinion Gear not a slip fit

The spring keeps the sealing ring against the main bearing race, it does not hold the gear in place. The pressure is very light on it, hence the light spring. The gear is to sit 5/16 off the case face. The less it moves the better.
Robbie
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barry

Posts: 300

Joined: Sat Oct 11, 2003 12:01 am

Location: wooster oh usa

Post Fri Feb 17, 2012 2:18 pm

Re: Pinion Gear not a slip fit

we always honed parts with a pocket stone to be tight slip fit for restoring bikes for street use.racing was another story... those we set up a little on the loose side for expansion in extreme conditions.

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