Bosch AK42 Chainsaw leaking oil when stored.

H. Neary

They nearly all leak as they get older. You may well find if you store it a certain way up, the oil doesn't leak out. I try to run mine out of oil before I store it

Most saws do, often the pump is a rotary plunger working on an axial cam, the oil can leak past the sides of the plunger, from a breather and simply from residual oil in the outlet. Store it on a newspaper.

If you use OSR as the lubricant and don't intend using it for a while empty the tank and run a small amount of mineral oil through.

AJH

Mine leaked from day one. Taking into account the sophisticated motor and mechanical adjustments of these machines it seems as if the oil delivery was not thought properly (was it so difficult to provide a way to regulate the oil flow?) It leaks ALL oil left in the deposit. (so I need to refill everytime I use it again)

total loss oiling system will lose oil over time when stored ... not much you can do about it except turn it upside down and drain the oil ....

Patxitxi explained :

I dare say it has lost many gallons of oil, since this was originally posted five years ago.

mine does

There's a claim here, the oil is propelled by an oil pump that runs off the throttle.

Chainsaw oils (red tinted) come in "summer" and "winter", the winter being thinner for low temperature outside work. Like felling trees after an ice storm. The summer oil is thicker, so some of it will stay on the bar and chain.

And that's different than the mechanism that keeps a gasoline engine piston lubricated. That's just the chain oiler mechanism. The chain oiler window should have the "red tint" showing.

Paul

store it on whichever side leaks less.

Well it's certainly wrong for one of my (three) chainsaws, mine had a little cam driven pump. Admittedly mine are electric so running off the throttle isn't very likely! :-)

Mine has been sitting on a sheet of plastic for quite a while, and no signs of leakage, and the reservoir is usually at least half full.

Maybe some part of the housing isn't tight.

Paul

Yes? Even if stored 24 hours? 😂