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Molly 0-6-0 motion problem

Not enough valve movement

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David Bothwell 121/10/2017 08:43:58
78 forum posts

I purchased a psrt made Molly a while back, it ran on air at first. Then a part of the motion broke (delicate sliding link) after a re assembly the engine does not go. I have spent a long time re-making various parts including crank axle, eccentrics and improvement to reverse stand and lever.but after re-assembly there is not enough movement across the valve faces to open and close them. The mechanism (Stephensons link I think) seems quite complex with two sets of sliding links etc., Any suggestions/adv ice would be most welcome as this has become most frustrating

Jens Eirik Skogstad21/10/2017 09:05:29
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326 forum posts
21 photos

Timing incorrectly set?

Edited By Jens Eirik Skogstad on 21/10/2017 09:07:26

David Bothwell 121/10/2017 11:59:15
78 forum posts

Thankyou for the reply, I think it is just a combination of small things that are causing the problem, for instance there is "play" in the final part of the movemnet (between the "rocker" and the connection to the valve chamber) i.e. you can rock the rod and open the valve, or close it. I thought of making the rods a bit longer!

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