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Help needed Purley Grange

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Raymond Hodges04/07/2018 11:22:15
71 forum posts
1 photos

I started building the Purley Grange from LBSC in 2½" gauge in 2014. I have run it on air and have found the following problem.

In forward it runs on 4 bar quite good but in reverse, on the same presure it runs very fast.

Can someone tell me where i am going wrong.

Thank you

Ray

Jeff Dayman05/07/2018 21:17:27
2356 forum posts
47 photos

Hi Ray

I have not built your particular locomotive, but the problem sounds to me like it may be due to unequal valve movements forward vs reverse. Is your reverse stand in the right position? If you use a dial indicator to measure the valve movements all the way forward then all the way back, are these movements the same distance each way when reverser is in mid gear?

Might also be due to your valves' position on the spindles, or possibly your valve port positions are a bit off. Either way the valve adjustment can probably adjust the working to give more equal events or at least faster forward speed.

Raymond Hodges06/07/2018 08:52:10
71 forum posts
1 photos

Thank you Geoff

It seams i need to do a few checks, now i know where to start.

Its easy to make the parts but not so easy to get them to work together

Regards

Ray

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