Loose oil adjustment screw on 046--won't hold position.

[MtnHaul]

The oil pump seems to be putting out the right amount of oil, however, the adjustment screw always returns to the minimum output. I'll set the output to maximum and with just a few throttle blips the screw will be right back to minimum. I removed the oil pump from the case and there is no visible problem. The adjustment screw turns very easily and I'm guessing something is worn inside the housing--o-rings? bushing? other? I tried a few things to drive out that little pin but had to get back to firewood duty. Any tips on repairing that little adjuster? I hate to spend the money for a whole new pump since everything else looks good. When I spin the oil pump mechanism by hand nothing catches the adjuster screw so my guess is that the vibrations are turning the screw, but it's just a guess.

 

[huskihl]

Needs new O-rings on the control bolt

 

[MtnHaul]

Needs new O-rings on the control bolt

Are the o-rings a Stihl part or just whatever I can find at the hardware store? Any tips on driving out that little pin?

 

[huskihl]

Are the o-rings a Stihl part or just whatever I can find at the hardware store? Any tips on driving out that little pin?

If you could get the exact diameter and thickness, I don’t see why hardware store or auto parts store O-rings wouldn’t work.

I set my bench vise just a hair bigger than the diameter of that pin and tap it out with whatever I have laying around. Usually it’s a small drill bit that has broken a couple times but it’s still long enough to get it done. On reassembly, start the pin with needle nose and a hammer, and then make certain you are holding the control bolt in far enough while you tap the pin into place

 

[singinwoodwackr]

Are the o-rings a Stihl part or just whatever I can find at the hardware store? Any tips on driving out that little pin?

Do you have a caliper to measure it?
I have a bag full of oilers, could send you one with a good adjuster assembly.

This type?
These are parts oilers...corroded cases but the steel guts are good.