Latest boiler regs?

[George HughesParticipant @georgehughes62861]

Hi J,

The drive to the axle is live from the crank, so as the crank rotates, so does the axle. The drive pins in the hubs are the disconnect so it means the mechanical water pump, whether axle or crank driven are live all the time as the crank rotates.

It looks, Dave and Alan, that you will also need an extra bush in the top of the boiler (as well as the bottom for the mechanical water feed) as the water gauge needs to be isolated from other fittings, so cannot be used as a steam feed…

George

[JasonBModerator @jasonb]

Thanks George, I was not sure if you could run the pump while stationary. Removing the drive pins is a bit of a PITA but I suppose thats the price you pay for a simplified design with not gearing so you can't put it in neutral and just have the crank turning.

Pump size will need to be adjusted if running from crank or axle to allow for less strokes as the axle rotates less.

J

[George HughesParticipant @georgehughes62861]

Hi J,

Yes, the pump has a 3/4" stroke with a 1/2" bore as it's running at 1/16th speed of the crank, so that should do the job nicely, plus because its a slower motion there should be a better pumping action than a conventional crank driven pump as the balls will have better seating.

And like this the pump just bolts on the outside of the tender and is driven by the existing wheel hub. It's an easy fit.

George

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