mortalitool
ArboristSite Guru
Ok so I work on saws for a tree service company. Working on a ms660. Toasted top end. Bad grooving on the intake side of the piston. Deep grooves. I check out the lower end. Crank moves freely. No slop. Bearings feel great.
So I get a stihl piston cylinder kit. New crank seals. I'm thinking I'm doing it up right. Just as I always would/do.
Go to test the saw just now and it pops over right away but then after a few more pulls it feels hard to pull over. I grab my 660 and do a comparison. Yep this rebuilt one seems really hard to pullover. I start freaking out. I immediately tear the jug off and inspect the piston. Wow am I up a **** creek here. Piston shows deep grooves and is cracked. Piston rings are broken. I then look at the jug, deep grooves, both transfer ports are cracked. Wow. I just can't believe what I'm seeing. I paid for the parts out of my own pocket. That's how our relationship works between my tree guy and myself. Always been fine.
This is a stihl oem direct jug and piston kit. No aftermarket stuff here. What the heck is going on? Why would my piston immediately be grooved and jug transfers crack? NEED HELP! what should I be looking for?
I'm thinking offset on the crank? Maybe someone used 2 different cases at some point? Maybe the cases don't mate up correctly?
What do you all think? I'm panicking here. I can't afford to eat these parts. I'm about $360 into this with the jug piston kit and other misc parts it needed.
Sent from my SM-G900V using Tapatalk
So I get a stihl piston cylinder kit. New crank seals. I'm thinking I'm doing it up right. Just as I always would/do.
Go to test the saw just now and it pops over right away but then after a few more pulls it feels hard to pull over. I grab my 660 and do a comparison. Yep this rebuilt one seems really hard to pullover. I start freaking out. I immediately tear the jug off and inspect the piston. Wow am I up a **** creek here. Piston shows deep grooves and is cracked. Piston rings are broken. I then look at the jug, deep grooves, both transfer ports are cracked. Wow. I just can't believe what I'm seeing. I paid for the parts out of my own pocket. That's how our relationship works between my tree guy and myself. Always been fine.
This is a stihl oem direct jug and piston kit. No aftermarket stuff here. What the heck is going on? Why would my piston immediately be grooved and jug transfers crack? NEED HELP! what should I be looking for?
I'm thinking offset on the crank? Maybe someone used 2 different cases at some point? Maybe the cases don't mate up correctly?
What do you all think? I'm panicking here. I can't afford to eat these parts. I'm about $360 into this with the jug piston kit and other misc parts it needed.
Sent from my SM-G900V using Tapatalk