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450 Posts
I've built two 9fs and both now work really well except for what seems to be a leak in one of the cylinder drain valves. I've adjusted the closed and open position dozens of times but cannot fix the leak which manifests itself as small puffs of steam from just one of the ports. The drains work when open and this is just an irritant but, like most irritants, the more I fiddle with it, the more irritated I become! I was wondering whether any other 9F builders had encountered the same problem and what the fix might be - I suspect that the hole drilled int he cylinder to take the valves is slightly out of specification but, if it is, it's outside the accuracy of my plastic micrometer!