MartDalb
Addicted to ArboristSite
Hey everyone
Got a mystery case on my hands this time, and I need some help solving it.
Friend of my family has a an old Stihl 024 - from 1992.
It starts, but when put to wood it "won't rev and stalls or runs poorly". (his words)
Short story.
The saw was given to him for free, way back, he has no idea of its background story, he has had it for a few years, only uses it on rare occasions, but now it won't really run well enough to cut.
I did not want to start it up when I got it, so I just took it apart.
Took off the muffler and saw light scoring, and marks on the intake part as well, piston rings were not stuck.
I also started seeing signs of previous owner(s) not putting back original parts on it, like 8mm nuts replaced with Husky nuts on clutch cover, 5mm carb nuts replaced with "lock nuts", Torx27 screws replaced with whatever fit the need etc.
The carb needed a new kit and cleaning.
The impulse line was very worn as well as the fuel line, no holes yet but very close to it.
The black tank vent part was damaged and the " orange vent" inside the tank was gone.
Fuel filter was original, but old style orange (which as I recall is very old)
I did a pressure and vacuum test, it held fine for several minutes on both.
So nothing left but to take off the cylinder.
See picture.
The piston has damage, clearly! but yet had compression.
The cylinder itself seems more or less fine, it has light scratches, but nothing to worry about.
How in the world, does this piston have this sort of damage to it, and the cylinder is still fine? (piston is original Stihl btw, as is the cylinder)
It will need a little sanding, but that's it.
Piston needs a replacement, crank seals are fine.
What the hell happened here?
Got a mystery case on my hands this time, and I need some help solving it.
Friend of my family has a an old Stihl 024 - from 1992.
It starts, but when put to wood it "won't rev and stalls or runs poorly". (his words)
Short story.
The saw was given to him for free, way back, he has no idea of its background story, he has had it for a few years, only uses it on rare occasions, but now it won't really run well enough to cut.
I did not want to start it up when I got it, so I just took it apart.
Took off the muffler and saw light scoring, and marks on the intake part as well, piston rings were not stuck.
I also started seeing signs of previous owner(s) not putting back original parts on it, like 8mm nuts replaced with Husky nuts on clutch cover, 5mm carb nuts replaced with "lock nuts", Torx27 screws replaced with whatever fit the need etc.
The carb needed a new kit and cleaning.
The impulse line was very worn as well as the fuel line, no holes yet but very close to it.
The black tank vent part was damaged and the " orange vent" inside the tank was gone.
Fuel filter was original, but old style orange (which as I recall is very old)
I did a pressure and vacuum test, it held fine for several minutes on both.
So nothing left but to take off the cylinder.
See picture.
The piston has damage, clearly! but yet had compression.
The cylinder itself seems more or less fine, it has light scratches, but nothing to worry about.
How in the world, does this piston have this sort of damage to it, and the cylinder is still fine? (piston is original Stihl btw, as is the cylinder)
It will need a little sanding, but that's it.
Piston needs a replacement, crank seals are fine.
What the hell happened here?