Removed Outer Primary Cover.
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Seasoned HDF Member
Joined: Jan 2009
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From: WACO
Removed Outer Primary Cover.
On my 2018 Ultra with 22,500 miles on it. Never had it off. Wanted to check things out. Chain looked good. Not too lose. Not too tight. Tensioner shoe looked new. **** canned the so called dampener. Just a 1-1/4" by 1.5" piece of round stock bolted to the cover with a 1/4-20 bolt. Heard too many horror stories about that bolt snapping or backing out. Causing catastrophic havoc in the primary. Only question I have. The teeth on the compensator sprocket were sharper or more pointed than on the clutch basket. Is that normal? I didn't see any signs of excessive wear on comp. teeth. Thanks.
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Joined: Mar 2010
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From: Honah Lee
I had the gear machines as a Supervisor in the toolmaker shop where we did certain gears and sprockets before the Shipyard sourced all gearing out.
When I became a supervisor in 1970, some of the machines were from the 1940s and one for huge herringbone gears was designed and built by the Shipyard.
This is why the tooth has a bigger flat on the OD. And the deburring and rounding edges quite often is by hand work.
I have never seen a worn out covered oil bath sprocket from the primary on here. The chain drive is actually more efficient than gears as far as a drain on HP.
As required. Caution AI
The tooth profile of chain sprockets often looks and acts differently on sprockets with different outside diameters (ODs), primarily because the number of teeth (which dictates the OD) changes how the chain wraps around the sprocket.
While all sprockets for the same chain size share the same pitch (distance between rollers), smaller sprockets require a different tooth profile to manage higher articulation angles, stress, and noise compared to larger sprocket
When I became a supervisor in 1970, some of the machines were from the 1940s and one for huge herringbone gears was designed and built by the Shipyard.
This is why the tooth has a bigger flat on the OD. And the deburring and rounding edges quite often is by hand work.
I have never seen a worn out covered oil bath sprocket from the primary on here. The chain drive is actually more efficient than gears as far as a drain on HP.
As required. Caution AI
The tooth profile of chain sprockets often looks and acts differently on sprockets with different outside diameters (ODs), primarily because the number of teeth (which dictates the OD) changes how the chain wraps around the sprocket.
While all sprockets for the same chain size share the same pitch (distance between rollers), smaller sprockets require a different tooth profile to manage higher articulation angles, stress, and noise compared to larger sprocket
Last edited by Jackie Paper; Apr 24, 2026 at 04:55 PM.
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