piston froze in cylinder

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lawnboy1988

Member
hi i have a Clinton D65 chainsaw and the piston is froze up and i wanted to know whats the best thing to pour in the cylinder to free it up thanx.
 
lawnboy1988 said:
hi i have a Clinton D65 chainsaw and the piston is froze up and i wanted to know whats the best thing to pour in the cylinder to free it up thanx.
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I like a 50/50 mix of acetone and automatic transmission fluid. Odds are you've got a rebuild ahead of you if your piston stuck while running..:frown:
 
In my experience, I've just put some thin motor oil in the cylinder, and left it overnight then tried to turn it over the next day.

However, if the piston seized up, there is a good chance the engine will need a rebuild to get going again I'm afraid :frown:
 
It wasn't uncommon to seize/freeze a piston in the early days of snowmobiling. I don't know about your chainsaw, but was assumed the aluminum piston was toast and drove it out. The cylinders had a chrome steel liner and you could use a little muriatic acid (swimming pool supply company) on a rag and wipe the aluminum right off the liner and then use a cylinder hone and a new piston of the same size. If you saturated the rag and it got in the ports you were in trouble.
 
I have collected old 2 cycle outboard boat motors. When I get one set up I use PB Blaster. Let it soak a day or two and then just keep trying to turn the engine over. I have never yet not have one not turn over in a day or so. Also I have found with a good spark they will start right up and I have yet ever did anything with the piston or rings. They just run fine. If it was me I would try to start it with the old piston before pulling it apart and don't be surprised if it runs.
 
reynoldston said:
I have collected old 2 cycle outboard boat motors. When I get one set up I use PB Blaster. Let it soak a day or two and then just keep trying to turn the engine over. I have never yet not have one not turn over in a day or so. Also I have found with a good spark they will start right up and I have yet ever did anything with the piston or rings. They just run fine. If it was me I would try to start it with the old piston before pulling it apart and don't be surprised if it runs.
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Oh yes, definitely try starting it as soon as you get the piston free, I don't think anybody would recommend taking an engine apart before trying it, unless they wanted extra work :laughing:
 
Good point to try starting it. I guess snowmobiles and/or we were more destructive as the seized piston was usually also "ventilated," so you knew you were into a rebuild. These were pre EPA/regulations days and some of the guys were running nitro-methane for an edge.
 
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