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Old 01-29-2020, 01:34 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 6,998

measure the shaft on the cap. Looks very worn. Something must be loose, as you can see a groove worn in the side of the main tower walls. Top of the shaft looks very worn, indicating excess slop somewhere, allowing it to pivot and wear at the top. Also, make sure you take an ID measurement down low in the bushing. It looks more worn down there and would allow the pivotting that appears to be causing damage.

For busihings in an application where only one side of a rotating shaft is suppoted, multiple measurements down the length of the bushing are required. Also, you need to take measurments in numerous radial directions. Your wear appears to be an out of round issue. Some directions can show true and others highly worn. Bushings in this application can wear very differently than those where both ends of the shaft are supported.

N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019

Last edited by lr172 : 01-29-2020 at 01:42 PM.
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