Stihl Grub Screw Tank Vents?

[HarleyT]

You have to have a tank that is designed to work with it like the newer 026/MS260 which mounts from the *inside* of the tank.

Oh, I know.....

 

[HarleyT]

Here is the ipl pic from the 026, it shows 2 versions of the tank vent, ref#s 18-22 show the vent with Brad's flapper, #22 being Brad's flapper, which I am sure that it is a fine flapper, and works well, as intended, etc....

 

[HarleyT]

Here is a bulletin from 1997...

 

[blsnelling]

You have to have a tank that is designed to work with it like the newer 026/MS260 which mounts from the *inside* of the tank.

Even as old as the 084 is, IIRC, all of them would accept this newer vent. I'm not 100% sure on that though.

 

[blsnelling]

Here is a bulletin from 1997...View attachment 519740

Now I know what to call it It's a mushroom valve, not an umbrella valve.

 

[HarleyT]

But the tank has to look like this on the 026...

 

[HarleyT]

Take the top cap off....
Looks like this...

 

[HarleyT]

And take that filter off, here's the "flapper"...

 

[grizz55chev]

Now I know what to call it It's a mushroom valve, not an umbrella valve.

All tank vents matter!

 

[HarleyT]

So how do you make that flapper work on this?

 

[blsnelling]

My comments have been to point out the risks of using a grub screw tank vent, as he referenced. Those comments he read stemmed from working on a 084, thus my comments concerning that model. I am not saying that they will work on all saws. If it won't work on his saw, I would look for another alternative.

 

[HarleyT]

That is why I asked how you did it on an 084? What did you have to do to switch it over?

 

[blsnelling]

The 084 tank is made for these mushroom valves. The tit sticks up through the hole from inside the tank. You simply pull on that tit until the valve snaps into place. Remove the grub screw from the vent hose and you're done.

 

[blsnelling]

http://www.arboristsite.com/community/threads/stihl-tank-vents.45911/#post-624055

 

[Chris-PA]

And take that filter off, here's the "flapper"...View attachment 519747

Your saw photos take "grub" to an new level!

 

[HarleyT]

The 084 tank is made for these mushroom valves. The tit sticks up through the hole from inside the tank. You simply pull on that tit until the valve snaps into place. Remove the grub screw from the vent hose and you're done.

That is what I am talking about. How was the grub screw setup affixed to the tank?

 

[HarleyT]

Your saw photos take "grub" to an new level!

I am not a teenager anymore. I don't sit around and buff my junk much anymore....

 

[blsnelling]

That is what I am talking about. How was the grub screw setup affixed to the tank?

It's been too many years and I don't have pics of it. It was the factory setup.

 

[SteveSr]

And take that filter off, here's the "flapper"...View attachment 519747

Not quite... This is a similar setup to the mushroom but uses something similar to a gas cap vent and mounts from the *top* of the tank. Apparently this design still leaked too much for the EPA or Stihl so the design was changed to the red "mushroom" that mounts from the inside.

 

[hotshot]

I am not a teenager anymore. I don't sit around and buff my junk much anymore....

Pics of that Fish?...or maybe not


Topic aside, those umbrella check valves can be replaced with Holley carb bowl vent valve #26-41, about a dollar each at the race shop, much cheaper than Stihl 1110-353-1600!