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Post by maxamow on Nov 5, 2020 23:39:22 GMT -5
Im working on a Homelite 2000 with a decomp valve thats not working properly. Air seems to be escaping from the valve whether its in the open or closed position. Are these valves serviceable/cleanable? If so whats the process?
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Post by edju1958 on Nov 6, 2020 10:12:50 GMT -5
Does the valve open & close freely?Chances are that it's got carbon built up in it causing it to stick.You can spray some lubricant on & in it to see if that'll help.You might have to take the valve out & let it soak in some 50/50 solution of acetone & ATF to dissolve the carbon.Worst case scenario is you might have to replace the valve.
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Post by maxamow on Nov 6, 2020 20:41:33 GMT -5
It moves freely open and closed. Must be carbon build up. Do these unscrew to remove them?
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Post by undee70ss on Nov 6, 2020 22:33:37 GMT -5
It moves freely open and closed. Must be carbon build up. Do these unscrew to remove them? No.
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Post by maxamow on Nov 28, 2020 20:46:06 GMT -5
So I cleaned the valve and took it apart. No matter what i did i could still hear air leaking. I finally realized the leak was coming from a hole below the decomp valve. I checked a spare cylinder and found it has the same hole but has a screw in it. It doesn't look factory to me. What normally went here?
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Post by maxamow on Nov 28, 2020 20:52:05 GMT -5
And just clarify im talking about the screw sticking out below the decomp hole. This head is missing the valve assembly.
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Post by lesorubcheek on Nov 28, 2020 21:28:23 GMT -5
When the decomp valve is opened, or lifted up, that hole is for air to escape to de-pressurize the cylinder. It should be just a small open hole something like 1/8" diameter. If it's plugged with a screw, then the only place for any air to escape is a little along the valve and the housing. I'd guess an attempt to just plug the decomp. It's little hard for me to see in this pic, but it looks like the boss for holding the decomp valve is knocked off.
Back to your original cylinder, it's either as Ed said previously with carbon buildup inside where the valve contacts the cylinder, or the seat and/or valve have worn and it's not seating well. Even with a new cylinder and valve, I've noticed slight leaking if you try to pressurize the case to check for air leaks. Not sure if others have had the same experience, but that's why I use a block off plate that covers the case with the cylinder, rod and piston removed. Anyway, if you crank it over and there's alot of air coming out that little hole, then yes, somethings wrong.
Dan
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Post by lesorubcheek on Nov 28, 2020 21:35:29 GMT -5
Here's a pic from a cylinder showing the little hole and the boss for the decomp valve. Dan
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Post by maxamow on Nov 28, 2020 22:02:46 GMT -5
Okay, that makes sense. I might try a new valve assembly and see if that helps. Thank you.
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Post by maxamow on Nov 29, 2020 13:26:20 GMT -5
I pulled the valve assembly out out again and cleaned the seat area in the bottom of the chamber until I could see it was shinny metal. Despite having cleaned it previously it still had carbon in the bottom. I reinstalled the assembly and very gently taped it down. This time the valve seated fully and no air escapes that hole in the cylinder. I noticed however that taking the plug out doesn't seem to change the compression at all. At least just turning it by hand( by the flywheel) I dont notice that it turns easier when on decompression mode.
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