Check the ring pins on AM pistons!

[tree monkey]

meteor 660 pin failure, pro use for about 6 weeks

 

[jakethesnake]

View attachment 162411

Success

 

[Billy Currie]

Yikes, this thread is scary!

 

[Stump Shot]

Which way did he go? Lol
Almost got me, arrow pointing to the wrong side.

 

[Stevetheboatguy]

So...... I didn't quite read the whole thread, but........ Has anyone tried to top pin one of these? It used to be a common thing on the 3.0 omc's and 2.5 merc's. Never had a pin come out that was done like that.


Steven

 

[Billy Currie]

So...... I didn't quite read the whole thread, but........ Has anyone tried to top pin one of these? It used to be a common thing on the 3.0 omc's and 2.5 merc's. Never had a pin come out that was done like that.


Steven

You mean re-index the ring gap to another location on the piston? I have done that to get the ring gap in a more desirable location.....Away from transfers and exhaust ports.

 

[Stevetheboatguy]

You mean re-index the ring gap to another location on the piston? I have done that to get the ring gap in a more desirable location.....Away from transfers and exhaust ports.

A little simpler. The top pinning is drilling a .030-.035 hole through the dome at the rearmost of the locating pin. And you just tap it with a mig welder. Clip the wire off and file it flush with the top of the piston.

It sounds like a micky mouse thing to do, but it works really well on the outboards. Keeps the pins where they belong.


Steven

 

[Nutball]

I have a piston somewhere that points the wrong way too