MS250 problem

[Gloaming Tree Surgery]

Hi, just picked up a little MS250 for next to nothing, it runs nice enough but after about half an hour of not too stressful logging I have noticed that the chain oil is getting very hot, almost burning hot. Not something i've ever noticed with any other saws before. Anyone got any ideas??

[spudulike]

Hot in the tank, hot as it comes out of the oiling hole or hot on the bar?

[Gloaming Tree Surgery]

Hot in the tank, not sure about once it's on the bar

[spudulike]

If the oil is getting hot in the tank then you must be getting thermal transfer from the cylinder head through the crankcase and to the oil tank.

 

I reckon your cylinder head may be dirty and have wood chips and oil covering the cooling fins stopping them dissipating the heat.

[Gloaming Tree Surgery]

Cheers for the advice, I'll check it out. Haven't had the saw apart yet but it doesn't look particularly dirty.

[spudulike]

There is only one place the heat is coming from - the top end and muffler - I guess you may have a leak in the bottom of the muffler or it is somehow blowing exhaust gasses down on to the top of the oil tank - can't see it being much else - possibly worth fitting an Aluminium heatshield under the muffler - some saws have this as standard!

 

The 025 is a clamshell type engine - you may have lots of woodchip and gloop between the tank and the plastic oil tank transfering heat from one to the other.

[Gloaming Tree Surgery]

Good advice well given!! Cheers spudulike