The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
When the working diaphragm is pulled back fuel is forced through the outlet valve to the injector pump.As it returns the inlet valve opens and fuel is admitted to that space from the tank .. I don’t think anything maintains pressure other than by part 10 moving.
It started fine and ran for a few minutes quite happily but we’ll have to see how it works under load tomorrow !
vtsteam:
My guess, only a guess, is that the air space and the diaphragm damps the pressure pulses from the main diaphragm. And perhaps cushion the main pumping diaphragm as well from extremes of motion. In any case if missing, I wouldn't expect it to show up as an immediate problem. And if the cork and rubber gasket serve as a new damping diaphragm (if I'm correct at all), then function is fully restored, as long as it lasts.
vtsteam:
It's called a pulsator diaphragm. Though I can't find something exactly like yours, here are two similar images that label it:
vtsteam:
And from the mists of time -- 1945 to be exact, a pretty interesting document find:
http://www.easy39th.com/files/TM_9-1828A_Fuel_Pumps_1945.pdf
awemawson:
Wow Steve that's quite a document - and yes I've been through it fully ! Who'd imagine there would have been so many minor variants. Many have the pulsator diaphragm, several don't and some have an 'air dome' presumably for the same function.
What I find odd about the rubbery one that I removed is that the illustration definitely shows it as flat, whereas mine is exactly curved to sit fully against the cover with no air (or fuel) behind it, and it is fixed at the periphery by the cover and the centre by the retaining screw thus greatly reducing any potential movement.
No weeping over night and I've found the massive pistons that I thought I had so I'll do a melt today and load up the engine and see what happens. But first I need to work out how to cut up the pistons - at 5.25" they won't quite go in the crucible :bang:
Weighing in at 3 Kg's each it must have been a big engine that they came from !
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