I'm trying to get Yong Heng running one more time. New piston gaskets ect. Still not building pressure. I figured I'd check out the valve plate and change o rings. I think this is my problem.. Having a hard time finding them. Found some on eBay from China. See the internal valve plate broke off from the metal ring. Any input appreciated.
Yong Heng Valve plate
- Thread starter RM.510bigbore
- Start date
I found some on allieexpress. Wait for shipping from china. $10.00. Hopefully this is the problem. Becoming the yong heng mechanic because of my air hog 50 cal Texan . 
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Reedmosser,
I've had several minor leaks in my 2-year-old YH. First was worn out Delrin "donut" washers my black-knobbed pressure-release screws tighten against to seal. Replaced with YH spare parts. I've had rubber "O" rings fail inside 2 female foster fittings, tore apart top half of YH looking for first leak before finding foster leak, next foster leak I caught right away. While top half of YH apart noticed Dowty seal (metal/rubber) from steel tubing to top of high-pressure cap had failed, due to being loose, replaced with YH spare parts. Hope this helps. WM
I've had several minor leaks in my 2-year-old YH. First was worn out Delrin "donut" washers my black-knobbed pressure-release screws tighten against to seal. Replaced with YH spare parts. I've had rubber "O" rings fail inside 2 female foster fittings, tore apart top half of YH looking for first leak before finding foster leak, next foster leak I caught right away. While top half of YH apart noticed Dowty seal (metal/rubber) from steel tubing to top of high-pressure cap had failed, due to being loose, replaced with YH spare parts. Hope this helps. WM
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I've bought O-rings several places but my favorite is "Mr. O-ring". Their website is being redone at the moment, however, and you get routed to Amazon - which isn't terrible but the interface is different. I measure the size of the O-ring I need to replace as carefully as possible, both the OD and the thickness, and then look for the replacement (google it). Most are 70 duro but I may try a 90 next time I replace the O-ring that is close to the reed valve of my Yong Heng. Nitrile is fine.
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