Copied from Google Groups, Misc.Rural
http://groups.google.com/group/misc...0856b2d81db/8ce9cfb07998c380#8ce9cfb07998c380
> <[email protected]> wrote:
> > I have an ageing Stihl chainsaw, which is still running fine, except that it
> > seems to pump out very little chain oil onto the chain.
>
> > I'm pretty sure that until recently I'd get through at least half a tank of
> > oil to a tank of petrol; now it seems more like one tank of oil to four or
> > five tanks of petrol. I also seem to remember that I used to be able to see
> > oil being flung from the chain if I revved it up; now I don't see that at
> > all
>
> > I took it in to a dealer last week who charged me 35 UKP and said they'd
> > fixed it, but it's still the same. Before I go back to him, can anyone tell
> > me whether it sounds to them as if something is still wrong. . I assume
> > that if it was a blockage either I'd have found it or they would; if it is
> > the pump, is that going to be very expensive?
>
> Most chain saws (even older ones, and cheapo electrics too) have a bar
> oil rate adjustment screw. The rate of bar oil fed should be set so
> that the rate of feed is just a hair below the point where you see oil
> spraying off the chain at full open throttle... any oil spray is
> wasted, and oil you see on the wood you're cutting is wasted (also can
> spoil the wood). The oil is for lubing the metal to metal contact
> between bar and chain, NOT to lube the wood cutting... in fact oil
> getting onto the wood impedes the cutting by causing the sawdust to
> clump and jam and gum up the the saw sprocket. There should be only
> enough oil fed to lube the groove in the bar, not the chain teeth.
> When you use a hand saw or any other kind of power saw you don't oil
> the wood or the blade... wood saw teeth cut best dry, the dryer the
> better. There is no such thing as an oil feed to fuel consumption
> ratio... folks can rationalize by counting backwards after the fact
> but there is absolutely no credibility in such inane claims. Don't
> permit excessive idling either, that's also a waste of bar oil, and
> fuel of course... for safety sake always shut off a chain saw when
> you're not sawing.
Geez. I wish I hadda known that years ago. Think of all the money I wasted buying oil!:biggrinbounce2:
Harry K
http://groups.google.com/group/misc...0856b2d81db/8ce9cfb07998c380#8ce9cfb07998c380
> <[email protected]> wrote:
> > I have an ageing Stihl chainsaw, which is still running fine, except that it
> > seems to pump out very little chain oil onto the chain.
>
> > I'm pretty sure that until recently I'd get through at least half a tank of
> > oil to a tank of petrol; now it seems more like one tank of oil to four or
> > five tanks of petrol. I also seem to remember that I used to be able to see
> > oil being flung from the chain if I revved it up; now I don't see that at
> > all
>
> > I took it in to a dealer last week who charged me 35 UKP and said they'd
> > fixed it, but it's still the same. Before I go back to him, can anyone tell
> > me whether it sounds to them as if something is still wrong. . I assume
> > that if it was a blockage either I'd have found it or they would; if it is
> > the pump, is that going to be very expensive?
>
> Most chain saws (even older ones, and cheapo electrics too) have a bar
> oil rate adjustment screw. The rate of bar oil fed should be set so
> that the rate of feed is just a hair below the point where you see oil
> spraying off the chain at full open throttle... any oil spray is
> wasted, and oil you see on the wood you're cutting is wasted (also can
> spoil the wood). The oil is for lubing the metal to metal contact
> between bar and chain, NOT to lube the wood cutting... in fact oil
> getting onto the wood impedes the cutting by causing the sawdust to
> clump and jam and gum up the the saw sprocket. There should be only
> enough oil fed to lube the groove in the bar, not the chain teeth.
> When you use a hand saw or any other kind of power saw you don't oil
> the wood or the blade... wood saw teeth cut best dry, the dryer the
> better. There is no such thing as an oil feed to fuel consumption
> ratio... folks can rationalize by counting backwards after the fact
> but there is absolutely no credibility in such inane claims. Don't
> permit excessive idling either, that's also a waste of bar oil, and
> fuel of course... for safety sake always shut off a chain saw when
> you're not sawing.
Geez. I wish I hadda known that years ago. Think of all the money I wasted buying oil!:biggrinbounce2:
Harry K
