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General control line discussion => Open Forum => Topic started by: Dwayne Donnelly on June 15, 2022, 06:12:14 AM

Title: Wrist pin pads
Post by: Dwayne Donnelly on June 15, 2022, 06:12:14 AM

Lost one of the wrist pin pads from a Merco 40, please what material can I use to make another one.
Thanks y1

Title: Re: Wrist pin pads
Post by: Massimo Rimoldi on June 15, 2022, 06:20:09 AM

Hi.

PTFE (teflon) is ok.

Massimo

Title: Re: Wrist pin pads
Post by: Steve Helmick on June 16, 2022, 08:04:45 PM

Some K&B engines used Teflon wristpin pads, but IMO, they didn't last terribly long, so keep that in mind and make more than you think you'll ever need. A lot of older engines used brass pads, of course, but I would opt for plastic. There is a graphite impregnated version of Delrin that would be my choice...but I don't remember the name of it. I machined bushings from it, about 40 years ago, and it was nice to machine (Hardinge chucker) and quite slick.

By "graphite", I mean the lubricant type graphite, and not the carbon fiber type graphite. I wish folks wouldn't use the term "graphite" interchangeably with "carbon fiber". Fishing rod makers are the WORST on this.  y1 Steve

Title: Re: Wrist pin pads
Post by: Dwayne Donnelly on June 17, 2022, 12:11:49 PM

Thanks guys, I forgot I had a couple of old 4 strokes that use them, I was able to reshape one to fit.  ;D