The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
awemawson:
:ddb: Well I'm delighted to say that she's now running on both cylinders - first time in years :ddb:
VERY carefully checked which TDC mark corresponded to which cylinder, then sprayed them different colours 'just in case' - only had sheep marker sprays so they will eventually bio-degrade !
Fitted the pumps one by one, but when I came to set up the fuel rack positions discovered that the new pumps had no calibration marks on the racks :bang: Waiting for the supplier to give me a reasonable explanation why they are not there, he's 'checking with his diesel man' . So I had to do it a bit hit and miss, which is annoying as the 'spill point' entirely depends on the initial setting of the rack to set the injection timing accurately. Anyway she's running, and I can probably do a bit of itterative tweaking to get it a bit closer than it is currently.
To celebrate I've decided to give her a reconditioned set of injectors as these ones are not perfect. I took them out today to clean them, then thought - 'hang it, replace them'
Only got to put the mechanics back together, change the air, diesel and oil filters having given her an oil change. Oh and chip the concrete off the top of the gear box so I can get at the oil filler, sort the centre articulation pivot that is VERY sloppy, and then 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.
Might even take a sledge hammer to the 'body work' and take out a few dents :lol:
mattinker:
Good stuff!!
John Rudd:
--- Quote from: awemawson on November 11, 2015, 07:16:48 AM ---
Might even take a sledge hammer to the 'body work' and take out a few dents :lol:
--- End quote ---
A bit of spannering and body building too.....! Is there no end to your talents? :bow:
Well Done Andrew....good you got it sorted.. :clap:
petertheterrible:
Timing with either the left or right timing marks won't lead to a breakage of the pump. The only way to screw up something by timing alone on one of these is to change the timing on the gears, which would lead to bent valves. (Wrong marks used = won't start)
Are the pumps you got new or re-conned? Most re-conned parts usually don't have a lot of markings of any type. Have a disassembled pump needing to be rebuild, if it is fine with you I can post pick in a couple weeks time.
Best pump set tool, better than a piece of saw blade, is to cut the tail of a cheap vernier or use one of these plastic card, material, salesman verniers and altering the mouth to look like the beak of a bird that flew into a windscreen. Small inside leg calipers also work when you have adequate access.
You broke the pump by setting the stroke of the follower so far that it crushed the piston of the pump, ie stroke of pump was exceeded by stroke region of follower, and the only thing that could give was the pump body.
I had engines in the past, other models, where the spill was set to far either bending the cam/ breaking cam bush housings/ breaking gears on the timing train, not on PH models though, so you are extremely lucky.
Slackening the pump won't tell you anything as the pump is spring laden and will rise. After setting spill the pump is left alone and the engine while decompressed is turned slowly by hand, preferably without a crank to attain if the bump stop is exceeded.
On Rustons, small one's, the follower is of the plunger type with set screw that bends with excessive force, pump bodies can be cast iron.
petertheterrible:
Actually don't feel bad about breaking the pump, you are definitely not the first that broke the ears off. Incorrect setting of diesel pumps off all kinds has lead to the death of many a engine and many a smile on the engine builders mugs. :)
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