sixteenacrewood
ArboristSite Member
Hi Everyone
I need some input
My Dolmar 7910 started to run rough, hard to keep it idling but it would rev to WOT, then died and would not restart. It was smoking from around the muffle where some saw dust and canola had accumulated.
I decided to pull it off the mill, let it cool down, and cleaned it up, pulled the muffler and cleaned behind it.
I have this saw on a procut carriage mill, like a band mill but with a chainsaw. I run this saw pretty hard.
I had just finished milling a 24" dia. yellow pine log, when this happened.
I used a flash light and checked the piston and cylinder for damage while the muffler was off.
The piston looks new, but the cylinder on the intake side looks to be scored. this is from the exhaust side.
I decided to shoot some photos and get some input from some of you who have more experience. Does this look normal? or does it look damaged?
The plug looks to be light silver grey so I shot photos, does the plug look normal? Or does it look like it was running hot/lean?
I have searched here and another site and looked at a ton of photos, but still not certain of my next move
I have not pulled the carb or intake yet, I hate to pull things apart if some of you think this looks normal.
I am going to put it back together and see if she will start.
I am a good mechanic, just no experience with worn cylinders. I have fried a piston and cylinder on my 9010, but it looked a lot worse/ different from this, not hard to diagnose.
This saw is a money maker and I don't mind replacing the top end if its needed, plus, I need it running asap.
I don't have a compression tester but plan to get one later today, nearest town is 20+ miles from here.
Thanks in advance for any input.
I need some input
My Dolmar 7910 started to run rough, hard to keep it idling but it would rev to WOT, then died and would not restart. It was smoking from around the muffle where some saw dust and canola had accumulated.
I decided to pull it off the mill, let it cool down, and cleaned it up, pulled the muffler and cleaned behind it.
I have this saw on a procut carriage mill, like a band mill but with a chainsaw. I run this saw pretty hard.
I had just finished milling a 24" dia. yellow pine log, when this happened.
I used a flash light and checked the piston and cylinder for damage while the muffler was off.
The piston looks new, but the cylinder on the intake side looks to be scored. this is from the exhaust side.
I decided to shoot some photos and get some input from some of you who have more experience. Does this look normal? or does it look damaged?
The plug looks to be light silver grey so I shot photos, does the plug look normal? Or does it look like it was running hot/lean?
I have searched here and another site and looked at a ton of photos, but still not certain of my next move
I have not pulled the carb or intake yet, I hate to pull things apart if some of you think this looks normal.
I am going to put it back together and see if she will start.
I am a good mechanic, just no experience with worn cylinders. I have fried a piston and cylinder on my 9010, but it looked a lot worse/ different from this, not hard to diagnose.
This saw is a money maker and I don't mind replacing the top end if its needed, plus, I need it running asap.
I don't have a compression tester but plan to get one later today, nearest town is 20+ miles from here.
Thanks in advance for any input.