Log in
Search
Latest topics
» Just a little doodleby roddie Today at 7:21 pm
» Cox 010 TeeDee crankshaft removal
by Mudhen Today at 7:13 pm
» It's been a nautical day
by rsv1cox Today at 6:39 pm
» Cox 020 Pee Wee average motor run time?
by sosam117 Today at 6:27 pm
» Rehab of another lost cause
by rdw777 Today at 5:28 pm
» Hanging the TD's -1 and 3
by latole Today at 2:49 pm
» A 93 year old..
by rsv1cox Today at 12:06 pm
» Mr. 10,000
by getback Today at 7:06 am
» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (December 2023)
by Kim Today at 1:21 am
» Nitro Fuel To Deliver to fiji Islands
by balogh Today at 12:49 am
» Space Bug Jr. - Trying to determine just how stupid I want to get
by Admin Yesterday at 4:22 pm
» I invite you to a flight on board.
by akjgardner Yesterday at 1:29 pm
How I measure piston-rod end play
Page 1 of 1
How I measure piston-rod end play
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.





The Simple Mark
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.





The Simple Mark
batjac- Diamond Member
Posts : 2316
Join date : 2013-05-22
Age : 60
Location : Broken Arrow, OK, USA
Re: How I measure piston-rod end play
A good idea,thanks for posting
balogh- Top Poster
Posts : 4621
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: How I measure piston-rod end play
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.
Re: How I measure piston-rod end play
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!
NEW222- Top Poster
- Posts : 3869
Join date : 2011-08-13
Age : 45
Location : oakbank, mb

» Crankshaft end play
» What causes a piston head to mushroom when you reset the piston rod?
» Wanted: Cox .15 piston, or piston/cylinder - FOUND!
» It's time to play... What Is This?!
» TD .051 crankshaft end play
» What causes a piston head to mushroom when you reset the piston rod?
» Wanted: Cox .15 piston, or piston/cylinder - FOUND!
» It's time to play... What Is This?!
» TD .051 crankshaft end play
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum