McCulloch chain oil in cylinder

[normde2001]

Working on a friends McCulloch 16" Eager Beaver chainsaw which runs fine until the cylinder fills up with chain oil, mostly after sitting. There is a metering device on the oiler that actually sends chain oil into the crankcase. With saw lying flat, the oil seeps into the cylinder until it won't crank without draining. Anybody had experience with this?

 

[slowrev]

I have not experienced that problem but it sounds like a bad seal.

Ben

 

[normde2001]

I think I got it figured out. Apparently the crankcase vents gases, supposedly, out through the oiler to assist auto oiling, however a couple of dried up "O" rings allows oil to flow back into the crankcase. will find out for sure tomorrow with new "O" rings. Took crank case apart to check seal, appears ok.

 

[slowrev]

Yep, sounds about right, o rings/selas or whatever. Was not really familiar with that saw but it seemed the only possibliity.
hope it works /forums/images/graemlins/smile.gif

Ben

 

[loehrman]

I think I got it figured out. Apparently the crankcase vents gases, supposedly, out through the oiler to assist auto oiling, however a couple of dried up "O" rings allows oil to flow back into the crankcase. will find out for sure tomorrow with new "O" rings. Took crank case apart to check seal, appears ok.

I have the same problem with a manual oiler. Did the seals work and which seal were they. Thanks Bob

 

[a.palmer jr.]

Some of those McCulloch saws use crankcase pulses to operate the oil pump for the chain. My 700 is that way. If you let it sit for a long time it's a good idea to drain the oil tank or it fills up the cylinder.