Originally Posted by
ReloaderFred
I had this problem with a new to me Magma Master Caster that the previous owner said had a small leak. He was right, so I drained the pot and removed the valve stem, cleaned it thoroughly and found there was no deformation on it at all. Next I formed a wooden dowel rod to roughly the shape of the valve stem and chucked it in a cordless drill, and ran it into the spout hole while the pot was hot, thinking this would remove any loose debris in the valve. Then I put it back together and there was no leak.
About an hour into the next casting session, it started to leak again, so I went through the whole process listed above, only this time I added stainless steel wool to the wooden dowel and let it spin longer. Put it all back together and continued to cast, with just an occasional drip, but after about 4 hours of casting (I often spend 8 hours casting on the Master Caster) it started to drip again, only worse this time.
The frustration level was getting pretty high at this point, so I just scooted back my stool and watched it drip for a few minutes, which didn't help my blood pressure much. Finally, a light bulb in the back of my brain went on and it dawned on me that the valve works by shoving a tapered rod into a round hole, so something was stuck in there that the dowel wasn't removing. I took my soft head hammer, the kind with a nylon head on one end and hard rubber on the other, and lightly tapped the top of the valve rod a couple of times and the drip slowed down considerably. I tapped it a couple more times and the drip stopped altogether. Whatever was in there was either dislodged by the tapping, or conformed to the shape of the spout.
I now keep my handy dandy little hammer close to my Master Caster, and if it starts to drip, I just tap the top of the valve rod a couple of times and it stops dripping. I don't know if I've knocked the foreign object out of the spout, or scared the Master Caster into submission, but it works.
When the pot is hot, try tapping the top of the valve rod lightly and see if it cures the problem. It can't hurt, as long as you don't get mad and really smack it a good one........
Hope this helps.
Fred