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How to true your crank!

Snowmobile How-To's

 
 
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  #1  
Old 09-19-2007
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Default How to true your crank!

This was written by a guy working on a PWC crank but it's the same thing.

Credit goes to AllCool (if you run into him ask him about his old 650 with decker pipes)

"To check the truing only takes a set of v blocks and a dial indicator. You might be surprised to see how much run-out your high dollar crank job returns with.
Or how much run-out on a brand new Yamaha crank, out of the crate.

allcool"

http://www.slednutz.com/images/user_upload/allcool.wmv
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Old 09-19-2007
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Default Re: How to true your crank!

LOL it goes something like this,

get BIG lead hammer.
hold crank in hand.
SMACK crank with said BIG hammer.

works pretty well.
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Old 10-03-2007
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Default Re: How to true your crank!

Basically the point of it is, check your runout first. If you're within spec, don't sweat it. Also the less runout your crank has the higher RPM you can safely operate without destroying bearings.

If your crank is not true - you need to get it there. Along the lines of what Bulldog said, you actually do use a hammer. More than likely a plastic mallet will be sufficient. It's surprising how easily a crank is "adjusted". This is the reason that when you drop a crank or try and remove a clutch incorrectly you misalign it. The video explains how to adjust it properly, where to hit it and what effect it has on the runout.
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Old 10-03-2007
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Default Re: How to true your crank!

not a bad video.
first thing to check is phase, that is make sure all the center pins are inline.

send is runout, or truness, that is making sure all the pins run parallel.

if the phase is out the crank can't be true. but just becuase the crank isn't true doesn't mean its out of phase.
adjusting phase will take a much harder hit then truing the crank.(you'll need a lead hammer, or at least a dead blow)
adjusting runout can be done with a C-clamp.

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Old 10-03-2007
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Default Re: How to true your crank!

I spent a few years in the 80's grinding automotive cranks, you wouldnt believe
how far a forged steel crank will bend and twist. We used jig that had a set of
v-blocks and a hydraulic hook to straighten them, twist you had to grind out.
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Old 10-04-2007
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Default Re: How to true your crank!

I watched eric hanson straighten my crank ( ) and he had a vice grip c clamp and a small brass hammer. sqweeze here and a tap there and BAM back to straight.
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