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I have a lionel 4-12-2 with the whistle steam that has a fill hole in one of its domes with the rubber plug that keeps the hole from leaking, Just recently the smoke started leaking out of that hole at a surprising rate yet the rubber plug still is on the hole, I am not sure if these need replacing every so often cause the engine is over 7 years old at this point. Was wondering if anyone has encountered this and if they found a fix.

video is attached showing the rate at which smoke leaks and that the rubber plug is still present.

Update this was fixed by putting a drop of smoke fluid on the o ring and its brass fitting.

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20190813_152916
Last edited by acrking76
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I have that same engine but have not had this problem (yet). However I agree that the rubber fittings, including the rubber pads, that Lionel uses on smoke unit fill opening parts will deteriorate (and in the case of the pads pretty quickly). The O ring on the plug on this engine should not be hard to replace. I have not checked whether Lionel list it as a separate part but in any case a substitute should be relatively easy to find on Amazon.  

I also agree that it looks from your video that there is a lot of back pressure forcing the smoke vapor back towards the fill hole but that is common with Lionel whistle and other accessory smoke features that use tubing to connect the smoke unit to the fill point.

okay so Update, I was looking through the manual trying to find if the part number for the ring was listed and the manual had a strange fix that ended up working. The manual said to put a drop of smoke fluid on the o ring and its brass fitting, this worked fine and it is now not leaking. The smoke unit is pretty loud on this engine so I was planning on opening it up and oiling that I will check it there is anything in the tube connecting the smoke unit and whistle to see if anything is stopping the flow of smoke.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
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