Nuklear6
I Dream 10' Surf!
Was assembling a 780 today using wiseco pistons. I always put one wrist pin clip in with the piston in my hands then the other once the pin is in and assembled on the rod. I am very cautious when doing this and always take the time to tilt my head and look to the top of the clip and see that it's actually seated, as sometimes only one side or the other actual seats and the sound of it going into place still happens even though its not fully in the groove.
That being said what happened today was the clip went in the groove (and made the proper noise) upon inspection something didn't look right. It seemed even though the clip was in the groove that it wasn't all the way down in. So I took it off and gave the wrist pin a good push to make sure it was all the way over to the opposite side and it was. So I reinstall the clip same look. Take the entire piston assembly back apart. Go to other side of the bench and sure enough the wrist pin was too long for the distance between the machined groove in the piston. I took the other wrist pin out of the next pistons box and it measures the same and has the same result. Put the clip in with out the pin and it snaps in perfect. Ends up the piston was machined a bit off. I had to take .015" off the length of the wrist pin to get everything too seat. The other piston was fine no adjustment needed.
Now this was not a major issue but had someone just heard the snap and figured they were good to go, there is a good chance they would have had an epic failure. Long storey short just take great concern (as you always should) to your wrist pin clips. Just figured id pass this along just to help someone avoid a big problem.
Chuck Palmucci
CPT Enterprise LLC
That being said what happened today was the clip went in the groove (and made the proper noise) upon inspection something didn't look right. It seemed even though the clip was in the groove that it wasn't all the way down in. So I took it off and gave the wrist pin a good push to make sure it was all the way over to the opposite side and it was. So I reinstall the clip same look. Take the entire piston assembly back apart. Go to other side of the bench and sure enough the wrist pin was too long for the distance between the machined groove in the piston. I took the other wrist pin out of the next pistons box and it measures the same and has the same result. Put the clip in with out the pin and it snaps in perfect. Ends up the piston was machined a bit off. I had to take .015" off the length of the wrist pin to get everything too seat. The other piston was fine no adjustment needed.
Now this was not a major issue but had someone just heard the snap and figured they were good to go, there is a good chance they would have had an epic failure. Long storey short just take great concern (as you always should) to your wrist pin clips. Just figured id pass this along just to help someone avoid a big problem.
Chuck Palmucci
CPT Enterprise LLC
! Good heads up right there...you probably saved someone an engine.
