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shred:
Before re-making the spool, try whipping up a temporary manifold from a bit of pipe and some soft solder (connect either both top or both bottom ports). If you install that instead of the spool assembly the engine will run in only one direction, but you cut out a lot of the plumbing for debugging purposes.

spuddevans:
That is a great idea Shred,
--- Quote from: shred on March 18, 2010, 08:50:14 PM ---Before re-making the spool,
--- End quote ---
:doh: :doh: :doh: :doh: :doh: :doh: :doh:

I spent yesterday afternoon remaking the spool, it was probably a needed action as when I examined the bore of the speed/direction valve I noticed that it was not truely round and parallel, so I mounted it up in the vice and took a skimming cut with a boring bar until the bore was properly cleaned up. Then I remade the spool, it turns out to be about 0.4mm bigger than the original one, but it fits better in the bore now.

When I re-assembled the spool into the valve but before remounting the valve onto the engine, I applied air to it to see if it would shut off properly ( the previous spool would leak like the titanic even when turned off ) and it did ( apart from a little hiss leaking from the joints, and that is because I have no gasketing at the moment ) so I think that the remake was needed ( or at least that is what I keep telling myself :lol: )

It did turn over for a little while ( about 20 revolutions or so ) before stopping, so I think I need to spend some time on the timing of it.

( repeat with me ) We WILL get it working, we WILL get it working :lol:

Tim

NickG:
Not far off now Tim, does it turn over freely by hand now? There really shouldn't be any binding. Once you get this valve sorted that should be it keep at it, most engines have a period of trouble shooting esp relatively complex ones like this! :thumbup:

spuddevans:

--- Quote from: NickG on March 19, 2010, 02:27:19 PM ---Not far off now Tim, does it turn over freely by hand now? There really shouldn't be any binding. Once you get this valve sorted that should be it keep at it, most engines have a period of trouble shooting esp relatively complex ones like this! :thumbup:

--- End quote ---

When I had the top and bottom of the engine seperated the bottom crank assembly was completely free. When assembled there is some friction coming from the crosshead guide rods, I have one in each pair or rods fastened slightly loosely in order to get it running in.

There is also a little friction coming from the piston valve and pistons, but it does turn over with fingers.

I havent had time yet to look at the timing, that will be the 1st thing I look at and try to get sorted.

Tim

Brass_Machine:
I have faith Tim, you will get it running. I have no suggestions for trouble shooting as I haven't built one of these (yet!)

Eric

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