yes it ran well on compressed air but when I tried it on the track in steam it was very poor not starting on its own with out a push and then only went 2 ft and stopped it did run a little better backwards but ran out of steam very quickly so after all that work a complete failur.
one of the problems is all the chassis that I'm using now are none runners that I bought some years ago and have problems before I start the mods.
i have spent at least 3 days trying to find out what the problem is with this engine and have gone through every part taking it to bits and inspecting ever part. In the end I cam to the conclusion that the valve assembly was worn to the point that when hot it was acting differently from when cold and running on compressed air all looked fine. I think Hornby did find a problem with this part and on later models chrome plated it which while a good idea for the rotating valve and stopped any wear to the valve port faces not so good on the valve shaft as this is stainless steel which is a mixture of chrome and steel means you are now running 2 metals of the same type against each other which will cause them to wear out faster and if poor oiling is added to the equation it life becomes even shorter.
i have toyed with the idea to re engineer this part and make it a lititle better but getting back to the engine I decided that I would replace the valve assemble which would need machining it as the valve unit is a none standard part now for this engine plus change the cylinder assembly so a major rebuild along with making up new connecting rods.
all this work was carried out and after a few runs in steam it has run much better there are still problems like the main drivers are slipping which is bad as this uses up the steam fast and leaves the engine out of steam at some point and the engine sits there while the pressure builds up then it's off again with wheels spinning till it reaches the same point again and stops due to lack of steam.
This is the old part remove and a new one made
so now the question arises which wheels need rubber tyres and will have to remove them from the engine and machine some grooves in the metal tyres
i did get the from bogies to run ok so at least one thing went with out a hitch but as to the set under the cab lots of problems there using flanged wheels has presented a problem and I see why Hornby opted for flangeless wheels floating above the track.
so still lots to do which is Nearly all rework to get the engine to run properly plus still working on making the outside valve gear rotate
Now your up to date Ken