Author Topic: improving Grubb screw type vents  (Read 193 times)

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Offline aclarke

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improving Grubb screw type vents
« on: October 26, 2015, 11:07:22 pm »
[img http:///img]

Trying to figure out a no leak tank vent to retrofit the older grub screw type on older saws. Found a R/C valve that works for a while then the gas eats the flapper material.  Anyone know of a similar sized check valve that's gas proof??


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Offline 3000 FPS

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Re: improving Grubb screw type vents
« Reply #1 on: October 26, 2015, 11:54:56 pm »
The only other ones I know of are the ones I see on the Echo and Shindiawa weed trimmers.
PP 505, 475, 445.

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #2 on: October 27, 2015, 09:47:19 am »
Thanks, I'll take a look at them

Online srcarr52

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Re: improving Grubb screw type vents
« Reply #3 on: October 27, 2015, 10:12:55 am »
Shouldn't there be a flapper check valve pulled into the tank? All you need on the line is something to keep debris out.

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #4 on: October 27, 2015, 12:04:01 pm »
Shawn, I'll check. This one had two grub screws in it

Online srcarr52

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Re: improving Grubb screw type vents
« Reply #5 on: October 27, 2015, 02:05:42 pm »
Some stihl models should be a rubber umbrella flapper inside the tank with the tit pulled into the breather boss area. They are the exact same umbrella flapper used in accelerator pumps in holley and edelbrock carbs. This keeps anything from leaving the tank, then the line has grub screws to keep the debris out.


Offline aclarke

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Re: improving Grubb screw type vents
« Reply #6 on: October 27, 2015, 02:28:57 pm »
Yep, bought a couple dozen of those last month for about 50 cents each!!   Stihl was about $8.

 Not sure if this early 044 tank has one of the umbrella check valves like the later tanks.  I'll check tonight

Offline dannyupsolate

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Re: improving Grubb screw type vents
« Reply #7 on: October 27, 2015, 04:11:12 pm »
echo type vents $1.89 at carbtech21

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #8 on: October 29, 2015, 12:15:51 pm »
Shawn, saw IS set up for an umbrella vent but missing. Put a new one in!!  Nightmare to pull through as the tube is Sooooo small. Used small hemostats.

Carburetor umbrella and Stihl appear identical less the mfg markings

Offline aclarke

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Re: improving Grubb screw type vents
« Reply #9 on: October 29, 2015, 12:17:01 pm »
Stihl on right



[img http:///img]

 

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