fidiro
ArboristSite Guru
I just took apart a RedMax EB7001 and found the piston shattered at the skirt. I am still able to measure it and it comes up to about 47.48 at skirt and 47.39 above rings. There is still wear lines throughout most of piston so it did not wear out thin.
What I did find odd, and I'm not a professional mechanic, is that the piston pin is tapered thinner on ends where piston would ride and pin is thicker where piston bearing sits. Pin almost looks like it was professionally tapered equally on both sides of bearing. So it had a sloppy piston from either a worn pin or something. Piston is Zenoah, made in Japan so it is all original including pin. Is the material used to make the pins not stronger then the aluminum piston? Also, is the crankshaft supposed to slide some from side to side, I'm getting about 1/16" from side to side not up/down.
It sucks that I just picked this one up along with a EBZ8000 and was hoping to find just worn rings on the 7001 and found more then I was hoping to find which includes a small crack at the bottom of crank that pushed the gasket out. I'm hoping to JB weld that little crack to get it running.
I still have to tear down the 8000 hoping for something better but I hear a grinding and fear the bottom end needs attention.
I'm going to get my pics uploaded here in a bit so you guys can look at it.
What I did find odd, and I'm not a professional mechanic, is that the piston pin is tapered thinner on ends where piston would ride and pin is thicker where piston bearing sits. Pin almost looks like it was professionally tapered equally on both sides of bearing. So it had a sloppy piston from either a worn pin or something. Piston is Zenoah, made in Japan so it is all original including pin. Is the material used to make the pins not stronger then the aluminum piston? Also, is the crankshaft supposed to slide some from side to side, I'm getting about 1/16" from side to side not up/down.
It sucks that I just picked this one up along with a EBZ8000 and was hoping to find just worn rings on the 7001 and found more then I was hoping to find which includes a small crack at the bottom of crank that pushed the gasket out. I'm hoping to JB weld that little crack to get it running.
I still have to tear down the 8000 hoping for something better but I hear a grinding and fear the bottom end needs attention.
I'm going to get my pics uploaded here in a bit so you guys can look at it.