[WhatsUpcountry]

I've got an XT M8000 crankset that I swapped back onto a bike and have managed to misplace the washer / O-ring that goes between the non-drive side crank arm and the bottom bracket. Is it okay to run for a handful of rides or do I risk damage to the crank spindle? I'm not sure if that piece helps center the crank arm or just prevents dirt from getting into the space between the BB and spindle.

The piece I am missing is part # Y1F316000 labeled #5 in this diagram:

 

[127.0.0.1]

it's a dirt/water seal

ok to run without till you get a new one

Shimano Hollowtech-II BB/Crank Sealing O-Ring

Shimano Hollowtech-II BB/Crank Sealing O-Ring :: From $4.00 :: Shimano Bottom Bracket Parts

www.universalcycles.com

 

[armyofevilrobots]

Pull the crank, drive to the closest auto-parts store. Go into the back where they have their o-ring selection, and find one that seats in nicely. Go home, put it back on, and ride without worrying about getting dirt in your bearings. I've found matches for reverb internals that way (although I did bring calipers to match size), and that's way more finicky than the crank seal.

 

[WhatsUpcountry]

Thanks for the info, I've already ordered the replacement piece and am just waiting for that to arrive. Will run as is until then!