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Post by cdem72 on Feb 11, 2021 21:30:30 GMT
This is one thing I have not attempted and don't want to screw it up. Should you just remove the welch plug to access the check valve, then wash out thoroughly with carb cleaner, or actually replace if you can find the part? If removing, how do you actually pop it out? Thanks to anyone who can provide the proper instruction!
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Post by joeolympique on Feb 12, 2021 3:37:18 GMT
NOS HD check valves are hard to find. It's pressed in so you need a punch and hammer to remove it, unlike the HR valves which are threaded. Punch and hammer, delicately, to install a new one. I think the shop manual addresses this if memory serves me, maybe a photo even. If you can see the ball rattling around freely it's probably ok, spray with cleaner and hope for the best. If the ball is sticking or looks disfigured then replace the valve.
I use a hand drill on welch plugs to avoid damaging the casting. Once I've drilled through the plug I use a seal pick with a hook end to pop/pry the plug out. Take care not to leverage the pick against the edge of the hole, the casting is very soft and easily damaged. If the welch plug hole gets maimed the plug will not seal and the carb will likely be lost.
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Post by cdem72 on Feb 13, 2021 19:52:19 GMT
OK, That seems to make sense. But how do you use a punch to tap out the check valve when it is within the barrel of the carb. Pleae educate this old duffer? With the plates and welch plug removed it would be exposed from the bottom, but I fail to understand how to drive it out from the top? Thanks.
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Post by Doo640ER on Feb 13, 2021 20:09:46 GMT
I've never replaced one of these myself, so please wait until someone else confirms, but believe you press it out from the bottom, and press the new one in, in the same direction. Also from the bottom.
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Post by olyman on Feb 14, 2021 0:16:30 GMT
You guys are right - you have to take out the welch plug, then tap it out gently. There is space in the big hoop thing for it to go into and then fall out one side. The new one goes in the same way the old one came out. Just make sure its flush at the top. Just go slow, and use a punch that is very flat... a little at a time and you'll be fine. The Hermit taught me a while back how to do this.
He also said that the little plastic ball inside that valve is no match for harsh chemicals - don't use them. The likes of WD-40 is perfectly fine though and what I use to get that thing all wet to test it. With the welch plug out just put a little 1/8' hose on the valve and try blowing one way, then the other. It will be pretty clear that its working or not. Should seal tightly.
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