DIR Return Create A Forum - Home
---------------------------------------------------------
Chainsaw Repair
HTML https://chainsawrepair.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Echo
*****************************************************
#Post#: 71269--------------------------------------------------
Piston Position?
By: Giles Date: April 21, 2016, 4:56 pm
---------------------------------------------------------
I have a unique problem--
I have built hundreds of chainsaw engines and know that pistons
are marked, most to exhaust, for their position in cylinder.
However, I was given an Echo CS590 and the unknown previous
owner had cleaned up piston for reinstall.
They put a mirror finish on the top of piston erasing the arrow
mark.
Piston ring pins line up perfectly in both the possible
positions.
I am thinking either way would be OK?
#Post#: 71270--------------------------------------------------
Re: Piston Position?
By: 660magnum Date: April 21, 2016, 4:59 pm
---------------------------------------------------------
Take a look at the skirt of the piston. The intake side is
sometimes different from the exhaust side.
Often the machine marks are worn from the intake side
#Post#: 71275--------------------------------------------------
Re: Piston Position?
By: sharkey Date: April 22, 2016, 2:54 am
---------------------------------------------------------
Pin in the rear. The piston will have a pin in the ring land to
keep the ring from turning in the bore. Single ring piston has
the pin smack dab in the center of the intake. Actually the
piston doesnt come down far enough to expose the ring one
installed in the cylinder, but if it did it would sit right in
the middle of the intake. Pay attention to which way the ring
rides in the land, which side of the ring is up, because the pin
is at the top of the land.
*****************************************************