fidiro
ArboristSite Guru
I just threw new rings on my TS360 and gave the OEM piston a shot. Tested comp before first attempt to start it up and came up with 135psi. So I went ahead and got it all together to fire it up. It ran good for a little while and idled fine for a few minutes and then shut down. I attempted to restart with no luck. End gap on rings came up at .012
Now I don't remember exact #'s of piston skirts but it was somewhere around 48.5 mm while the top end of piston around landings came up close to 49mm.
What is considered too worn of a piston to reuse? I ask because now piston locked while I attempted to restart so I'm gessing a ring got stuck on something and wonder if it's to do with worn skirts. At least it didn't lock while running on it's own. I haven't taken it apart again yet to see where it got hung on but I did pull plug and see that top of piston is probably just above exhaust hole. I'll pull muffler tomorrow to see if it caught there.
Also, I removed the head gasket that measured about .50mm and if I squshed the gasket some with caliper and it compresses to around .42 Instead of reusing a paper gasket I cut out a piece of aluminum house flashing and made a gasket to fit, the thickness of the flashing is .37 plus I added some gray sealant to both sides of new aluminum gasket and on bottom end so that added some height, if any. I don't have anything to check squish but I tried without any gasket first and I could hear the piston tap the top of cylinder, I tried this without the rings on just to see. With these two numbers being so close, is it still possible that the squish could be too tight?
Now I don't remember exact #'s of piston skirts but it was somewhere around 48.5 mm while the top end of piston around landings came up close to 49mm.
What is considered too worn of a piston to reuse? I ask because now piston locked while I attempted to restart so I'm gessing a ring got stuck on something and wonder if it's to do with worn skirts. At least it didn't lock while running on it's own. I haven't taken it apart again yet to see where it got hung on but I did pull plug and see that top of piston is probably just above exhaust hole. I'll pull muffler tomorrow to see if it caught there.
Also, I removed the head gasket that measured about .50mm and if I squshed the gasket some with caliper and it compresses to around .42 Instead of reusing a paper gasket I cut out a piece of aluminum house flashing and made a gasket to fit, the thickness of the flashing is .37 plus I added some gray sealant to both sides of new aluminum gasket and on bottom end so that added some height, if any. I don't have anything to check squish but I tried without any gasket first and I could hear the piston tap the top of cylinder, I tried this without the rings on just to see. With these two numbers being so close, is it still possible that the squish could be too tight?