Trigger-Time
Addicted to ArboristSite
IMHO, If you can catch your finger nail in that score line, in the compression area of cylinder, cylinder is toast.
Last edited:
need your opinion on piston and cylinder wall, if i need to replace them
- Thread starter DOJO
- Start date
Help Support Arborist Forum:
Tazman1602
ArboristSite Operative
FRIED DUDE. REPLACE IT! Adjust carb to max rpm when you get it done too and make sure tank is clean with right mix.
Haywire Haywood
Fiscal Conservative Social Retard
Let me clarify that. Adjust carburetor to max recommended RPM for that model saw. If you adjust to max rpm possible, you will have a new P&C that looks exactly like what you just dropped in the trash in very short order. In fact, to play it safe, I would err a couple hundred under max recommended. Might run a little rich, but better a little rich than a little lean.
Ian
Last edited:
I have two Stihls that were just like that. My 024 has looked like that for years. A flat file takes the high spots off the piston. +1 on the muriatic acid. New rings, and it'll run until you know weather you want to rebuild it or not (or until it doesn't owe you anything and you have nothing to lose). 026 are worth big bucks for some reason. Might be worth new stuff but I would clean it up and get it running like it is first.
+1 better than aftermarket and just as cheap.
Brad is a also one of the best persons I've brought parts from
Tazman1602
ArboristSite Operative
Absolutely correct Ian. Thanks for clarifiying that one! My dealer actually gave me a chart with max rpm speeds for ALL Huskys that I'll work on. Very nice.
..drop sum acid on it................
Brad, would you elaborate a bit on this procedure? I could see this ending rather badly, like when I reverse engineered my boss's Excel spreadsheet, lol
That he could fix, but..............
Seriously, do you just rub the acid soaked Q-tip on there, let it soak, or what? Knuckleheads need step-by step when there are dangerous chemicals that run the risk of damaging more than just a Mahle 028 Super cylinder...
Brad, would you elaborate a bit on this procedure? I could see this ending rather badly, like when I reverse engineered my boss's Excel spreadsheet, lol
That he could fix, but..............
Seriously, do you just rub the acid soaked Q-tip on there, let it soak, or what? Knuckleheads need step-by step when there are dangerous chemicals that run the risk of damaging more than just a Mahle 028 Super cylinder...
Lakeside53
Stihl Wrenching
Degrease the cylinder first with 4:1 diluted Purple cleaner, then wash with a lot of water. Dry... then q-tip on the acid.. let it fizz the aluminum away... wipe often with a q-tip and maybe a little help from scotch-brite. Keep acid out of the ports. Neutralize the acids with purple cleaner, and wash in water again and again...
Thanks, Doc. I'll be tryin' that one tonight, I think. Hope the bore is good. I will be postin' a pic of a piston that looks very much like someone thought that "Mix" means to shake the can of raw gas before you pour it in the saw.....:bang:
Lakeside53
Stihl Wrenching
So.....it's night out your way ?????:monkey: :monkey:
Yeah. How'd it go? Andy described it well.
Aww, I didn't make it to the store to get the muriatic today. Had a church commitment, and I was running late. Just got home. Will do it tomorrow. I'll go get it ready with purple cleaner tonight, though. Will post pics. I think the jug is OK. Man the piston kit is pricey at the dealer..........he cuts me a bit of a break on stuff, but no way on that one. Meteor it is, unless the jug is too scuffed, then its Tecomech.
That is a cool construction, with the dome piston. I bet it is high compression that way. Also the saw has four AV mounts, and the clutch cover is cool. Probably keeps things a lot cleaner.......
That is a cool construction, with the dome piston. I bet it is high compression that way. Also the saw has four AV mounts, and the clutch cover is cool. Probably keeps things a lot cleaner.......
Yup.
Well, I'm not sure. Is the green stuff on the Q-Tip® aluminum chloride, or Nikasil chloride? I did remove a good deal of aluminum, but it did take the shine off the coating. It is hard to know when to stop. Here are sum pics, not sure how well they will show what needs to be shown....
Look how new the rings were. This saw was a victim of straight gas child abuse!!!! I have contacted SPS, Saw Protective Services........
After treatment......
Opinions, gentlemen?
Lakeside53
Stihl Wrenching
looks o.k... Now hone it!
Hey Doc, is the green stuff aluminum or Nikasil? Is it true that if there is still aluminum residue in the bore, it will likely shorten the life of the new piston?
Lakeside53
Stihl Wrenching
It's aluminum, but if you've scratched though the nikersil, then it will make green forever. I don't worry about the tiny scraps of AL transfer - the hone will take care of that.
Make sure you neutralise the acid - don't leave if on overnight...
Make sure you neutralise the acid - don't leave if on overnight...
Lotsa SuperClean already. If the nikersil is penetrated, isn't the bore junk? Gosh I hope its not scratched through........
Lakeside53
Stihl Wrenching
Depends on where.... Above the exhaust port - yep... Below.. depends, but you can get away with a lot of damage...
pops21
Addicted to ArboristSite
Hey andy I'm doing the same thing to my 5100s cylinder. I have a TINY scratch in the cylinder. Its in between the exhaust port and the top of the head about 1/4 inch long :bang: . I can feel it gently rubbing over it with a jewelers screw driver, but not my finger nail. Would this be a problem?:bang:
Similar threads
