The Craftmans Shop > New from Old
Thwaites 2 Ton Two Cylinder Dumper Running On One Cylinder
petertheterrible:
The PH that you have can be timed to run in either direction, inlet becomes exhaust and your off.
New timing marks will be made and a new ID plate fitted indicating R.
If it says Petter it comes from England. AVA's come from India. Same thing, same quality sort off (internal paint peels/ lack the khaki appeal), different name.
Not to :wack: :hammer: your parade but the only broken pump bodies I have ever seen are due to human error and not the pumps, sorry.
One thing to look out for is that the right hand side bold attaching the pump also secures the priming lever and that these pumps are also shim-set where correct spill diesel quantity isn't reached.
awemawson:
Peter, yes I'm sure I'm the culprit in this case - just trying to work out how :scratch:
I've decided that when I fit the new pump I'll do the spill setting, then slacken the bolts holding the pump down and gently turn things over by hand pressing the pump onto it's mounting. If anything is fouling it'll rise up safely.
I believe that the AVA engines have a very slightly smaller bore with the same stoke, but the big ends are also a bit smaller.
awemawson:
To set the fuel rack position accurately there are two special tools illustrated in the book of words, and having done it this morning without them, I now appreciate why a special tool is recommended.
The rack slides horizontally in bushes in the pump body, and these bushes are pressed into a hole around which the casting is 'spot faced'. The rack itself has a calibration mark, and the critical setting is measured from the spot face to this calibration mark. For the 'maximum fuel setting' it needs to be 1/2" and with the overload stop in place it needs to be 13/16".
It's possible to do it with a digital vernier, but very fiddly and a bit subjective, as the measurement has to 'hook round' the bushes and the rubber bellows, so I thought I'd try and make a combination gauge with both measurements incorporated, roughly copying the illustration in the book.
(The actual measurement is from the end of the 'point' facing downwards to the under side of the horizontal pointer.)
Cut it on the Laser Engraver - it's only polycarbonate, but I'm hopefully not going to be using it very often :ddb:
(Did I say - I LOVE my laser engraver :lol: )
Manxmodder:
It's about time someone developed a process for case hardening polycarbonate :) .....OZ.
awemawson:
These little beauties arrived at lunch time, so I'll have to pluck up courage and fit them.
:bang: :bang: The only conclusion I can come to is I must have timed them on the wrong TDC mark on the flywheel :bang: :bang:
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