Attn. Saw Rebuilders..

Wood Hick · May 24, 2007

Well I have now got 084 parts everywhere! I want to ask the pro rebuilders out there a few Q's. I am dealing with two nearly complete saws, going to make one as close to new as possible. They are both from the same serial number range, and both were overheated, one very badly. They both turn over, and I can see the scored pistons. What I am looking for is a list of what to do, or what not to forget.
1) Is it necessary to acid wash the cylinder, or can I just clean it up with very fine honing stones?
2) When a saw overheats like that, what else should I be concerned with?
3) I am planning on taking the saw to the dealer to test vacuum and pressure on seals, crankcase, etc. Anything else that only they have the tools to do?
Give me some honest answers, and bear with me, I am good at many things but I am not a mechanic. This will most likely be an ongoing thread, and I appreciate the help!

andrewspens · May 24, 2007

Can't offer advice, but have a question

Sorry I can't offer any advice on your rebuilding. I do have a question, though. I am looking for a half wrap handlebar for my dad's 084. If you have one left over after your project, I would like to talk to you about getting it out of your way. :cheers:

chainsawjunky · May 24, 2007

To 3) they have flywheel pullers, do not try to take the flywheel off yourself unless you own a stihl flywheel puller. Depending on your dealer he might do it for free(like mine did). Evan

RiverRat2 · May 24, 2007

Wood Hick said:
1) Is it necessary to acid wash the cylinder, or can I just clean it up with very fine honing stones?
2) When a saw overheats like that, what else should I be concerned with?
3) I am planning on taking the saw to the dealer to test vacuum and pressure on seals, crankcase, etc. Anything else that only they have the tools to do?
Give me some honest answers, and bear with me, I am good at many things but I am not a mechanic. This will most likely be an ongoing thread, and I appreciate the help!

That sounds like a good plan to use tyhe best of both saws to make a runner,, I would leave the cylinder on it and take it to have it tested before you pull it down any further, pressure/vacum on the crank case, and pressure on the carb that will help you dignose why they leaned out,,,, that is very necesarry if you dont split the cases and take it all the way down,,,,

On the Cylinder, If its just aluminum transfer from the piston I suppose you could use a little well placed Muratic acid on a q-tip and a wooden dowel and some elbow grease to remove it,,,
if there is some small stuborn peices, keep cutting a fresh face on the end of the dowel and keep after it,,, then to finish wrap a bit of emory or fine grit sand paper with lots of lube and you will be surprized how well they clean up as long as the Nikasil isnt trashed,,,, save the hone for the last :cheers:

drunkenredneck · May 25, 2007

Wood Hick said:
Well I have now got 084 parts everywhere! I want to ask the pro rebuilders out there a few Q's. I am dealing with two nearly complete saws, going to make one as close to new as possible. They are both from the same serial number range, and both were overheated, one very badly. They both turn over, and I can see the scored pistons. What I am looking for is a list of what to do, or what not to forget.
1) Is it necessary to acid wash the cylinder, or can I just clean it up with very fine honing stones?
2) When a saw overheats like that, what else should I be concerned with?
3) I am planning on taking the saw to the dealer to test vacuum and pressure on seals, crankcase, etc. Anything else that only they have the tools to do?
Give me some honest answers, and bear with me, I am good at many things but I am not a mechanic. This will most likely be an ongoing thread, and I appreciate the help!

Ok 1 go buy a ball hone for just slightly oversize of the cylinder. An electric drill or a drill press works good to mount it. Use marvel's mystery oil or some kind of lube to hone it. You want to run it until you get all of the vertical streaks in the wall from the saw burning up out. If the chrome or nikasil peels or flakes off then the cylinder is basically useless to you. I bet at least one of them will be good.
2 I would replace the piston and rings first of all. Then if you were a real over achiever you could pull it down and check the phenolic races on the crank bearings but I wouldnt worry about it.
3 If your going to be doing most of the mechanical work I would go purchase a T27 t-handle if you dont have one and a flywheel puller both are very valueable objects which if you dink around with saws at all will be glad to have. And about haveing your dealer check those things out I would buy a set of seals and install them (not hard just take your time) since your into it this much. Or just assemble and if it does have an air leak you will know right away. There is so much that you could go through and do on those saws than I can type. I've been into and rebuilt a number of 084 088 and the newer versions. If you have any questions or need help pm me and I'll tell you what you will need. Have fun :cheers: