Inner primary bearing race spining
Stellar HDF Member
Joined: Mar 2006
Posts: 3,124
Likes: 255
From: From Long Island, now in So. Cal
Drag Specialties Inner Primary Mainshaft Race Bearing (Check Fitment)
https://www.denniskirk.com/drag-spec...rd/0203034.sku
34091-08 The right one for your bike
2006 Inner Primary Bearing #3 and Transmission Main Drive Gear Bearing Removal Photos:
https://www.hdforums.com/forum/showt...eferrerid=9012
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Seasoned HDF Member
Joined: Dec 2005
Posts: 19,957
Likes: 8,048
From: poway
Knowing you know what precision measurements are. Have you ever checked a new OEM shaft and sleeve to determine exactly the amount of press Harley engineers came up with?
There is a limit since when you start say going to 0.001 press, the OD of the inner race is going to grow apx. 0.0005
As many sleeves that I have seen move on here, I personally would not depend on Loctite. I went on the Loctite site for those mentioned above. And I have a Commerical grade 680 called out on a spec but in this case, race was trapped in a case with a snap ring. I was looking and it said it would take approximately 200 ft-lbs to move for a ballpark average of a 1" sleeve. So that may work. Sure would not want to depend on it for a trip bike. The worst case is it's going into a transmission seal I guess.
And obviously, the complete bearing one offered is a slip fit on the shaft and depends onload for the easiest thing to turn.. The bearings..
There is a limit since when you start say going to 0.001 press, the OD of the inner race is going to grow apx. 0.0005
As many sleeves that I have seen move on here, I personally would not depend on Loctite. I went on the Loctite site for those mentioned above. And I have a Commerical grade 680 called out on a spec but in this case, race was trapped in a case with a snap ring. I was looking and it said it would take approximately 200 ft-lbs to move for a ballpark average of a 1" sleeve. So that may work. Sure would not want to depend on it for a trip bike. The worst case is it's going into a transmission seal I guess.
And obviously, the complete bearing one offered is a slip fit on the shaft and depends onload for the easiest thing to turn.. The bearings..
Don't know exactly but have measured from 0.0005 to 0.0010.. That is what I would figure as a good press fit. The sleeve might grow 0.0005 if the press is 0.001. I see it when doing Timkens as a difference between running the bearings on a test holder and after installed on the crank. The running clearance on the roller bearing is probably between 1 to 2 thou so the expansion of the inner sleeve is allowed for.
If this were a pre stepped mainshaft, I wouldn't bother with the locktite. I'd use a 3205 or 6205 ball bearing.. Since this shaft has a step, it won't run into the mainshaft seal in the main drive gear.
If this one comes loose, it is captured between the clutch hub and the step.
Thread Starter
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6th Gear
Joined: Jun 2016
Posts: 12
Likes: 8
From: canada
Hi guys , I’ve installed the Harley race 34091-08 and a new oem inner primary bearing . I have to press it and it was very tight . Just want to thank you all for your time and advices . No more spinning race ! Ride safe !
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