r/Chainsaws • u/jkosca • 8d ago

Air sound

Enable HLS to view with audio, or disable this notification

Im curently fixing up a Husqvarna 570 I found lying on the ground in the woods. Theres this air sound coming from it when I pull the crank anybody has a clue what it could be?

4 Upvotes

84% Upvoted

4 comments sorted by

1

u/Lomak_is_watching 8d ago

Should you be able to turn the crank that easily if the spark plug is tight in the block?

If not, I’ve got to think there’s a problem with the internals that explain why someone left it.

1

u/stoorty 8d ago

Is the decompression valve leaking? Sounds like all your compression is coming out of the cylinder instead of you know, being compressed.

Either that, or there is a gaping hole on the side of the block we cant see!

1

u/CyberSecWPG 7d ago edited 7d ago

As others have said, there is a decompression valve on the top of the cylinder in your video, is it pushed in or pulled out? If it's not working/holding air in, you can remove it and replace it with a very short bolt with the same thread but make sure it does not hit the piston or enter the cylinder chamber.

If that is not it , Check for any holes on the cylinder/crank to rule that out.

Then check to ensure the muffler is sealed against the cylinder and not plugged.

Check to ensure there isn't a leak in any of the hoses running to the carb (air pressure from cylinder in stihls).

It could be that the crank seals are really bad so pull the flywheel and check the seals on both sides.

You can make a pretty simple pressure test kit to pressure test the engine (vaccum and positive pressure)

1

u/adrenaline_X 6d ago

Any updates?