fs 300

[darroch]

Guys, I posted a while ago about this clearing saw. I got a new Stihl piston and barrel for it.

 So I have it stripped a bit and plan to put new oil crank seals in as well. I have tried to remove the clutch side cover washer to get into the seal. I am assuming it is left hand thread on clutch side. The nut on the crank is rather odd rectangular shape. I have put some pressure on it clockwise to loosen but I don't want to overdo it yet. Does this screw out as the flywheel one came out no probs. Little real info or demo on this machine.

[darroch]

[Macpherson]

1 hour ago, darroch said:

Guys, I posted a while ago about this clearing saw. I got a new Stihl piston and barrel for it.

 So I have it stripped a bit and plan to put new oil crank seals in as well. I have tried to remove the clutch side cover washer to get into the seal. I am assuming it is left hand thread on clutch side. The nut on the crank is rather odd rectangular shape. I have put some pressure on it clockwise to loosen but I don't want to overdo it yet. Does this screw out as the flywheel one came out no probs. Little real info or demo on this machine.

 

Hi, looking at the end of the thread in your pic I'd say it's a RH thread so unscrew counter clock.. although I've not worked on one of these so can't say anything more but the nut does look odd... I suppose if you can get a good fitting spanner on it and give it a sharp chap it might budge.

[darroch]

Thanks.  I put some pressure on it with crank locked and flippin heck.........not half locked for a wee thing like that. Scared I damaged crank or something. The nut is 6 sided but longer on flat sides than ends. I cannot see that nut in a parts drawing on L&S. Wonder if it is part of that wheel like washer cover?

[darroch]

The nut on the stator/flywheel side is righty tighty. I thought that meant that the clutch side would be left hand thread? I may give it a go slackening anti clockwise in a gingerly fashion, less anyone warns........No!!🤩

[htb]

There is an arrow on the part showing which way to undo, which is anticlockwise.

[darroch]

I saw the arrows. Thought they were indication of the crank rotation..... doh!.

Thank you. I will attend to it.

[darroch]

All done.  Standard thread on both sides of crank on Stihl FS 300.

[darroch]

On getting this genuine Stihl barrel and piston from one of our big suppliers, it arrived with a broken ring. Ok these things happen and it was replaced prompt and free with gen, ring. On rebuilding the seals etc and barrel today, I went to attach muffler. Guess what?  5MM set screws wont take into barrel.  No thread, they have not been tapped. Where are Stihl making this stuff?  The original piston and barrel was Stihl stamped Mahle  This set is just Stihl, no Mahle on it.  Germans cannot make stuff in Germany any more. Their cars are the same now. Not a component made in the Fatherland and poor as a result.

I only have M5X0.5 tap.  Need to get an 0.8 tap tomorrow.

[adw]

Some cylinders are like this, if you look at the screws the thread  may very well be three sided so they self tap into the cylinder, if you tap the cylinder and use these screws they may be a slack fit.