stunthanger.com

Engine basics => Engine set up tips => Topic started by: Elwyn Aud on February 20, 2007, 03:30:03 PM

Title: Checking the rod/wristpin for sticking
Post by: Elwyn Aud on February 20, 2007, 03:30:03 PM

On something like a Fox 35 it's pretty simple. But say you have a ball-bearing engine and all you can see with the back-plate off  is the rod sticking out from between the two wristpin supports and there doesn't appear to be any slop in the wristpin.  How do you check for a stuck rod without taking everything apart? 

Title: Re: Checking the rod/wristpin for sticking
Post by: Bob Reeves on February 20, 2007, 03:51:17 PM

Hers what I think.... Should be enough room in the bottom of the piston to allow the rod to move back and forth a small amount. With the back plate off the rod should be able to be moved slightly to the rear. If it won't move still may not be stuck but the only way to tell for sure is to pull the liner. If it will move back easily it isn't stuck..

If the engine has been ran on castor (even 50/50) with no after run oil and it hasn't been ran in over a year the rod is stuck...

Title: Re: Checking the rod/wristpin for sticking
Post by: Elwyn Aud on February 20, 2007, 08:51:48 PM

I can see about 1/32 or so of easy movement side to side on the wristpin.