What is correct method to measure crank runout - Road Glide Forums
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post #1 of 12 (permalink) Old 09-29-2014, 12:39 PM Thread Starter
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What is correct method to measure crank runout

Got a question here that I cant seem to find an answer to. When measuring crank runout on a TC, is it measured at the nose on the right side or is it more precise to measure from the compensator side?
Reason is I have always seen it done where the dial indicator is mounted in a block bolted to the cam chest, I had a dealer show me my run out from a vice grip clamped to the frame and the snake arm bent up holding the DI on the nose tip. They claimed .004-005, but I could tap the snake arm with my fingernail and easily see a couple thousandths movement.
Would anyone with engine experience agree with me that the setup used is basically inaccurate?
NOTE: It is a welded crank with chain drive cams, it was taken apart because of a cut o ring and was sumping, it has a Feuling race pump which is red and there was a ever so slight brush mark in the red coating not really any wear on the pump housing.
Thanks again in advance for any info.

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post #2 of 12 (permalink) Old 09-29-2014, 06:34 PM
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This is the tool I use to measure crank runout. Bolts directly to the cam chest. I never cared for the snake type DI mounts and only use them if there is no other alternative.

http://www.ebay.com/itm/Pinion-Shaft...b42d00&vxp=mtr


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post #3 of 12 (permalink) Old 09-29-2014, 07:05 PM
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^^^^^ This ^^^^^

I have the Feuling tool, but looks identical to the one mocotom posted a link to.

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post #4 of 12 (permalink) Old 09-29-2014, 07:34 PM
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What are acceptable numbers for the crank run out on the TC ?

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post #5 of 12 (permalink) Old 09-29-2014, 10:02 PM
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Really?? A dial indicator vise gripped to the frame to measure crank run-out in a rubber-mounted motor???

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Last edited by HeatWave; 09-29-2014 at 10:05 PM.
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post #6 of 12 (permalink) Old 09-30-2014, 12:35 AM
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vise grips

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post #7 of 12 (permalink) Old 09-30-2014, 05:58 AM
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If you have an old cam plate, you can make one from that.
Acceptable r/o?
HD says .012" is still ok.
We say "not here."
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post #8 of 12 (permalink) Old 09-30-2014, 11:49 AM Thread Starter
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Scott,
Is the correct location to measure runout on the cam side and not on the comp side? Is the reading from the cam side indicate the runout on the comp side would be more?
I feel confident that my runout is acceptable based on what I saw and the method they used, and agree with others here the tool they used leaves too much room to be accurate.
My concern is really the fear factor it left me after dropping a small fortune in the motor. Thanks everyone for the replies

Note: snap on, mac and others make a universal dial indicator set that uses a snake arm and vise grip as a mount. I prefer the block mount or at least a threaded post and/or mag mount tha. The snake arm.

2012 CVO Roadglide Custom in Candy Cobalt/Twilight Blue, and it is almost completely stock. :0)))))
Mods are: Fullsac 1-3/4" baffles, Ohlins 6's (HD357), color matched chopped tour pack. Bluetooth stereo with Arc Audio amp and Focal speakers. On the bucket list; Ohlins drop in fork cartridges and the install of Fuel Moto catless 212 SS headpipe
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post #9 of 12 (permalink) Old 01-27-2015, 08:04 AM
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Anyone have or know where you can rent the shaft runout tool. Hate to buy something just to use once.
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post #10 of 12 (permalink) Old 01-28-2015, 07:40 AM
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I made a 1"x2" piece of steel,with a 1/4" hole.bolt it to one of the bolts holes for the cam plate & use a magnetic base indicator.put the indicator on the end of the pinion shaft.0.00" to .003" is good,.0035" to .005" is acceptable,above .005" needs attention (0.00" to .0035" for gear drive)
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