4 inch scale LSM Burrell

[marshall5]

I seem to get alot of hammer blow in the pump. Has anybody else had this problem and how did they overcome it?

In my experience with full size engines my Marshall had a ram which was a sloppy fit in the bore and my Ransome had a hollow ram. Would an air bottle be a solution?

Ray

[albert]

Hello Ray,
In the past I have had your problem and is usually due to a ristriction some where between pump ram and boiler internals
Some sudgestions:- internal bores of pump, valve lift too small,restrictions in pipes-kinks-pipe bore,boiler clack through passages-ball lift restricted.
Bye Albert.