Rubber O-rings in clutch.

[suitcase]

I have a 440 pro X fan for my son, and I was doing some clutch work and I had taken the bolt out of the primary and found 2 Rubber O-rings behind the head of the bolt, What are they for??????

 

[polarblu]

keeping the crank threads from becoming corroded? Is there a shelf, groove built in there for an o-ring or have they been compressed flat?I haven't seen this on any Poo i have taken off.

Polar

 

[alsled]

They are there to center the bolt in the clutch. They keep the bolt on the centerline of the crank axis.

Rubber also helps eliminate harmonics that break long bolts.

 

[suitcase]

Thanks good info, was scraching my head. I left them on figured they where there when we got the sled, so leave them.