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How I measure piston-rod end play

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Post  batjac Sat Jan 18, 2020 5:36 am

I was deleting old files from a thumb drive and found these pics that show how I measure the amount of play in pistons.  I'm not good measuring by just holding the piston/rod in one hand and a caliper in the other, so I made a simple jig to do it.

I took a scrap piece of ply and cut it into two pieces for the jig.  The first is just a stick with a couple more pieces glued to the bottom so I can clamp it in a vise, and a second piece for an arm with a slot in it.  I hammered a brad into the vise piece and hook the bottom of the rod on it.  Then I use the arm to hold the piston out to max distance and use my caliper to measure the distance.  Then I use the caliper and measure the minimum length.  The difference in the two measurements is the total end play in the ball joint.


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Post  balogh Sat Jan 18, 2020 7:23 am

A good idea,thanks for posting
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Post  andrew Sat Jan 18, 2020 8:33 am

Good approach to a fiddly job. What tolerance is acceptable before you do a reset? I've never measured the slop, but took a "That feels about right" approach.
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Post  NEW222 Sat Jan 18, 2020 11:56 am

Well isn't that a great, easy solution to measuring the end play. I have personally never measured any, but just went with what feels right. Now with your pictures, it will make something like this very easy. Thanks for the great tip and pictures!
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