Crank runout
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Road Captain
Joined: Aug 2006
Posts: 707
Likes: 38
Crank runout
What do you guys consider the limit on crank runout for doing a big bore? The last spec I looked up was for a 2011 street glide and that said a max of .012" so at what point do you insist on going through the bottom end ?
Sponsor
Joined: Dec 2007
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If it is say, .005" for instance, and is has stayed at .005" w/o movement, it was probably assembled that way.
Folks are always concerned with the pinion shaft TIR.
We've witnessed many with sprocket shaft issues.
Scott
Folks are always concerned with the pinion shaft TIR.
We've witnessed many with sprocket shaft issues.
Scott
HDF Community Team
Joined: Jun 2006
Posts: 12,774
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From: san antonio
.012" is the "new" runout tolerance for warranty purposes; it was .003" until '07 IIRC. Big bore has nothing to do with it. .003" is considered by many to be the max runout for gear drive cams although I have seen successful gear drive installs on runout of .004"-005". Of course one can run chain drive cams with more runout. The stability of the crank is the determining issue as to whether to address the crank. As Scott points out if runout is .005" and stays there, no worries. However, if .005" and 5K miles later it is .007"; the crank is not stable and should be addressed.
Road Master
Joined: May 2007
Posts: 851
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From: Mitchellville, Ia.
run out
.005" is my limit. I always lift up on the pinion shaft against the dial to see how loose the pinion bearing is also because this will give a false reading on total run out. .003" is my limit for gear drive cams.
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Road Captain
Joined: Aug 2006
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Thanks for the responses guys. I've been doing cam changes and big bore kits and such for friends the last few years. i always measure, but the spec in the service manual was all I had to go off of so appreciate the input. I always like seeing what the pros on these forums have to say.
Road Master
Joined: Feb 2015
Posts: 1,040
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From: Susanville CA
This may seem like a stupid Question, but does anyone have a diagram or picture of a cranksaft with the differents parts labeled, Like what end is the pinion shaft and whats the other side called. Only thing I have done in the bottom end is put new cams in and I just followed the directions that came wit the cams
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