Crank Runout
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
https://www.hdforums.com/forum/gener...-job-pics.html
Road Warrior
Joined: Apr 2011
Posts: 1,443
Likes: 9
From: North Carolina
any proof of this?
not doubting or disagree, just would like more info. If this is true, how and why would HD allow double that?
not doubting or disagree, just would like more info. If this is true, how and why would HD allow double that?
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
Moco just wants them to make it through the warranty period. Not that many newer bikes with 100k+. Its not an epidemic but something to be aware of.
Unofficial HDF Chaplain
Joined: Dec 2009
Posts: 21,128
Likes: 18,033
From: san diego
proof is when you have a shaft that is allowed up to .012 wobble, going thru a stationary hole, (your cam plate bushing) that has a .0015 clearance, with an oil pump bolted to it that runs an .003 tolerance, something has got to give sooner or later, is .005 going to do it? maybe later rather than sooner, depending on how its ridden, and remember this is something that is changing as the bike is ridden, so it slowly gets worse, and I know of few people who measure a failed motor, because at that point its a mute point. so not a lot of statistics really exist after the event. we all know the fix, and the cause is almost always the crank
Road Warrior
Joined: Apr 2011
Posts: 1,443
Likes: 9
From: North Carolina
proof is when you have a shaft that is allowed up to .012 wobble, going thru a stationary hole, (your cam plate bushing) that has a .0015 clearance, with an oil pump bolted to it that runs an .003 tolerance, something has got to give sooner or later, is .005 going to do it? maybe later rather than sooner, depending on how its ridden, and remember this is something that is changing as the bike is ridden, so it slowly gets worse, and I know of few people who measure a failed motor, because at that point its a mute point. so not a lot of statistics really exist after the event. we all know the fix, and the cause is almost always the crank
I work on 1/2 million dollar centrifugal chillers for Trane...I have done a few overhauls. Tolerances are un acceptable. WHen I am done **** is perfect.
How does the MoCo get away with basically building and engine that will fail, it's basically built to fail no way around it.
Seasoned HDF Member
Joined: Apr 2009
Posts: 44,794
Likes: 29,730
From: PNW
Mine went "out of spec" on my 2011 UGC at about 20k miles and 6k miles after a 107 build (100/120). The Moco would have replaced it with another pos crank. I opted to have it welded and plugged. They picked up the labor after the crank work cost.
Just sayin.
Just sayin.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Grand HDF Member
Joined: Dec 2007
Posts: 4,999
Likes: 55
From: Bay Area
Well to prove it last year my pump was shot. A builder which shall remain nameless said my runout was at .004 which was ok he put in a se pump and cam plate. 2 k miles later the motor was vibrating a lot. Took it to another shop and the new am plate had signs of wear.The runout was .006 that's when I pinned and welded the crank. Yeah I was riding hard doing some bud outs etc.
