crank clutch galling

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crank clutch galling

Postby rosco15 » Sun Dec 17, 2017 7:30 pm

I'm putting my shockwave OD clutch on a new crank. after every season I find galling on the clutch and crank shaft. What is the best way to minimize the galling I always seem to get. I've always just put the clutch on the crank dry.
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Re: crank clutch galling

Postby JrDragsterParts.com » Mon Dec 18, 2017 8:42 am

just a little anti seize and all should be good. be sure to use a new key-way. check your clutch post to be sure it isn't worn and still fits correctly.
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Re: crank clutch galling

Postby Ten5TireDad » Mon Dec 18, 2017 5:17 pm

Clean it with emory cloth, and use either a light film of grease, or some oil. DO NOT use anti seize!!!!!!!
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Re: crank clutch galling

Postby Pool Man » Mon Dec 18, 2017 6:24 pm

I agree with DO NOT USE anto seize. Light oil is the best thing.
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Re: crank clutch galling

Postby chief » Tue Dec 19, 2017 10:55 am

I've never had an issue in 10 years using a very thin layer of anti seize. I'm not sure what the objection to it is.
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Re: crank clutch galling

Postby WOLFRACING » Tue Dec 19, 2017 9:37 pm

chief wrote:I've never had an issue in 10 years using a very thin layer of anti seize. I'm not sure what the objection to it is.


I was wondering that too. It's kinda what the stuff is made for. Not doubting the experience that others have had. Just wondering.
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Re: crank clutch galling

Postby Pool Man » Wed Dec 20, 2017 9:36 am

Not sure if it is the same now, I have not looked. But years ago when I used it, it had had metallic properties to it that when applied to parts than harmonics to them it would actually cause them to seize the items together. I will do a search and see if that is still so.
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Re: crank clutch galling

Postby Ten5TireDad » Thu Dec 21, 2017 6:00 pm

Like Ron said that silver stuff will cause it to seize under the right conditions. Not to mention the smallest amount of that stuff makes a giant mess.
Here are 2 older posts with replies about not using that stuff either.

viewtopic.php?f=1&t=25910&p=177135&hilit=clutch+stuck#p177135

viewtopic.php?f=2&t=29046&p=195421&hilit=clutch+stuck#p195421
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Re: crank clutch galling

Postby rosco15 » Fri Dec 22, 2017 1:06 am

Thanks for the replies. I'm going to go with a bit of grease. See how that goes.
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Re: crank clutch galling

Postby wright realty » Fri Dec 22, 2017 9:36 am

Clutch galling is caused by the friction between the post and the crank. The crank has a torsional wind/unwind effect on the crank snout at each firing of the motor. Add in the torque from the clutch and your child whomping and it is a perfect situation from galling or cold welding which in actuality isn’t cold at all. In those cases where the clutch has welding to the crank, neither anti-seize, grease nor oil was the cause or would have prevented it. The number one contributing factor is friction from an ill-fitting clutch post, whether it was a result of the clutch being loose, worn keyway, worn post, etc

Most Anti seize is a blend of nickel, aluminum, silver or copper, with grease and graphite that in simple terms forms a barrier or lubricant between the two metals and has properties that withstands high temperatures. Grease provides lubrication but fails at high temperatures. This is why you see anti-seize being used in high temperature and high load application.

Now is an anti-seize necessary for a jr car, probably not, but given all factors equal, anti-seize out performs grease. In addressing the question; the best way to protect against galling is to check your clutch before each round to be sure that it fits tight with zero friction.
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Re: crank clutch galling

Postby slowgoat » Fri Dec 22, 2017 3:30 pm

You could always do a little preventative maintenance by taking it off, cleaning it an rubbing a small amount of wd-40 on it every couple times out
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Re: crank clutch galling

Postby ASM » Fri Dec 22, 2017 3:46 pm

slowgoat wrote:You could always do a little preventative maintenance by taking it off, cleaning it an rubbing a small amount of wd-40 on it every couple times out



Exactly!
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Re: crank clutch galling

Postby mossman » Sat Dec 23, 2017 6:31 pm

After having a post get stuck on a crank, we always used a light film of anti sieze. It worked well for us.
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