Can anyone tell me how hard it will be to switch out a cylinder and piston on a 039? I've done minor work but nothing as major as this. I think if I canger the torx specks things will be ok. Any advise?
Welcome to FHC! It's not the most complicated thing you can do, but there are a lot of small steps to it and some things you need to know along the way. That engine configuration is what's known as a "clamshell" design. It's called that because the engine is one independent assembly that utilizes a separate crank pan so to speak whereas other ("pro") saws have the entire lower end integrated in the case. What that means is on other saws with very little dis-assembly you can pull off the cylinder. On your saw you will virtually need to disassemble the entire saw to get the engine out. It would take awhile to go through all the steps, so just get started and post any and all questions right here along the way. Not sure how experienced you are or what tools you have, so if you would like a quick rundown of the tools you'll need, or even if you would like a step-by-step instruction just say so and we'll make it happen. Good luck! A couple of quick questions; Are you only replacing the piston & cylinder? Are you going OEM or aftermarket? There are some suggestions related to these as well...
Thanks for the welcome and I'm glad to be here. I have a lot of husky and johnsered experience but we have no dealers anymore so I went to a Stihl. I bought a new 250 and a 180 and love em. I needed something bigger to fell with so I bought this 039 and put a 25 inch bar on. Saw would run great until it got warm and then it would dog out. I pulled the muffler and that's when I found the scoring on the piston. Stihl dealer said its not worth fixing and would sale me a new 660 for 1300. I've done huskies and am pretty sure I could do this one. I wanted to ask questions before I started.
Well, if it runs that would lead us to believe the scoring isn't too bad which means there is a good chance the cylinder can be saved! There are a couple of different options on how to do that . . . one that uses acid and one that doesn't... If it's a saw you plan to keep it's definitely worth repairing in my opinion if scoring is the only problem.
I've seen guys use yery fine sand paper or steel wool to fix the cylinder. They put new piston an rings in .
