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Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder

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awemawson:
No I'm sure the problem was I set the pump spill point using the wrong cylinders TDC mark - as all references were to start with cylinder nearest the fly wheel I had assumed that that was #1. It's not ! The cylinders are 180 out from each other, so when I set the spill at 24 degrees before TDC I was actually more on the heel of the cam than the rising edge, so as it rotated, as you say the injection pump piston ran out of room.

It's a pity that the pump I destroyed was the better of the two, but never mind both were pretty ropey - lots of slack in the rack bushes, and the rack itself was noticeably worn.

The good news is in searching for an air filter element it turns out to be identical to the one I used in my JCB 3CX that I sold a couple of years ago, but still had spares on the shelf  :thumbup:

awemawson:
Did a quick fix to the rain cap for the air filter housing this afternoon. The rain cap had rusted / vibrated off years ago and was just sitting there by gravity. So I rolled up a 2" tube from some 1.5 mm galvanised sheet, cut some tabs into it, bent them out as mounting ears and bolted it all together. The 2" tube slips as a tight fit over the inlet which points upwards in use. Rolled up sheet was spot welded to form the tube which I rolled using a set of rollers I inherited from my friend George years back. Doesn't get used often but by heck they are useful at times.

I still need to sort the 'pop valve' that is just a little rubber moulding that sits on the spigot at the lower end of that picture - just a length of 40 mm soft rubber tube would do. The idea is that the suck of incoming air closes this valve, but any back fire has an easy route to escape and also dust collects on it and engine pressure variations expel it. No sign of a spare anywhere so I may well resort to the soft rubber tube if I can find any - maybe even a bit of old cycle inner tube if the bore is about right.

RussellT:
Well done Andrew. :clap:

I do admire the way you overcome difficulties that would have others scrapping the machines.


--- Quote from: awemawson on November 11, 2015, 07:16:48 AM ---   sort out the brake master cylinder - press the pedal and the brake come on and stay on, and can only be released by bleeding at the master cylinder outlet.

--- End quote ---

I had a similar problem with a car brake recently - it turned out to be a flexible hose which would only permit fluid to flow at high pressure.  It doesn't sound like that's the case on your dumper but I suspect a similar mechanism.

Russell

awemawson:
Thanks Russell.

Not had the master cylinder off yet - it may well not be original as it had obviously just been changed when I got the dumper years back so sourcing the rubber bits might be a chore.

Good news on the 'pop valve' (or dust valve, or vacuator or drain valve depending whose describing it) It looks as though one from a Massey Ferguson 165 tractor may fit with a bit of trimming to the flange on the filter housing  :ddb:

Pete W.:
Hi there, Andrew,

I'm pleased you're making good progress.

If the Ferguson tractor valve doesn't work out, try your local Dive shop!  It sounds as though the exhaust valve from the original Siebe-Gorman (or Cousteau-Gagnan) Aqualung demand valve might do the job. 

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