Mystery steam engine

[Charles Lamont]

If the eccentrics have been made as pairs in one piece then there will be a fixed angle between the two sheaves and we can work backwards from that to find the intended valve lap (ignoring lead). If the eccentrics are separate they may have been set, and then again they may not.

 

[chris123]

Amazing work jason
Awsome
The right valve gear is very stiff
Thats why the crank is hard to move
I check straight away the eccentric again

 

[chris123]

Hi jason and charles
The ofsett is
If jason could match 360degrees
Over the flange then some degrees could be
Obtained easy??
Chris

 

[Jasonb]

That is very close to 1/4" = 6.35mm so we can assume that is what the builder was aiming for.

Depending on how far the curved expansion links can move you may or maynot get the same movement at the valve rod.

The four ctr drill holes suggest one for each eccentric, not sure if they would have been used to turn them insitue or whether they were used to clock the eccentrics in once fitted to the crankshaft.

Can you take a Sharpie or similar and mark the position of the two crank pins on the flange, it looks like one is at about 4 o'clock and the other at 8 o'clock

 

[Charles Lamont]

From the latest photos there is a fillet radius between an eccentric and the bit of plain shaft between the sets, suggesting that the eccentrics are made as one piece with the shaft. There should not be a problem with slackening the eccentric straps, if that will ease the shaft. Or any of the other bearings.

 

[chris123]

Hi jason yes the centerhohles are for crankshaftturning
Thats why i thought the thing with the degrees
However the crank pins for the pistons
I will send
The valves are just eccentrics i think
Bud have to do it t morrow
Chris