Injection pump trouble - another one!

[ianpdexta]

Forgive me, I have reposted this as a new topic, fearing that it wasn't noticed in my restoration pics thread.

I have tried to start the Super Dexta today without success, the injection pump had been removed just to clean the exterior and paint it and the area of the block behind it. It was working before removal. It was refitted some time back and I believe it is correctly timed. I have bled it thoroughly twice with fuel gushing at the bleed nipples and nippled up during the lift pump stroke.

The problem at present is the injection pump, when cranking I get spurts of fuel from the No3 outlet fitting but 1 and 2 remain dry, and this after a considerable amount of cranking. I removed the injectors to take much of the load off the starter and battery.

On reading the manual I decided to change the oil on the injection pump, some clean oil came out and then I filled it to the level plug.

At one point I fitted the number 3 injector and connected it, there was a small amount of white vapour from the exhaust manifold but not as much as I would expect. In videos of people trying to start diesel engines the vapour cloud is much more noticeable.

Next step I took the inspection cover off the side of the pump see picture, I saw what I took to be the rack, when I tried to move it left and right with a finger it wouldn't move, I gently levered it with a screwdriver and it did move but seemed quite stiff. I would have expected it to be spring loaded in one direction and the governor move it the other way.?? Anyway having moved it fully to the left I did more cranking to see if the amount of white vapour would change, it seemed much the same.

Has anyone any ideas?

I haven't taken the pump to pieces and the ports were all covered when it was off the tractor. I did remove the two Allen screws and the stop cable bracket but I don't believe the knurled wheels were rotated.

Behind the inspection cover


1 and 2 both dry.


Any help on this will be much appreciated as I stumped at the moment.

Regards

Ian

[pat777]

I don't know enough about tractors to advise you on your specific problem, just I came across this previous discussion on starting trouble connected with injection pump, seems to be a few useful tips in there, that perhaps you have not considered. I do remember being advised by mechanic when I first got the tractor to clean out the tank and get a new fuel filter. There was some amount of sludge in the tank when I cleaned it out. Hopefully you'll get her going, very annoying when they won't start up.

http://www.fordsontractorpages.nl/phpbb ... hp?p=25193

[Beauwh]

Im also having trouble with mine. The lift pump seemed to not be working, when i pressed the lever it didnt do anything, so i got a new lift pump and put it on and it is doing the same thing. The line has a strong stream of fuel when disconnected but its like it just wont pump anything and has no resistance when pressed. I turned the motor over to re position the cam than it isnt pressing the rocker arm on the lift pump and still the same thing. I also noticed that my injector pump is low on oil, im unsure where to add oil or even what kind. and cant seem to find that info in my manual. Any help would be greatly appreciated

[ianpdexta]

Hello Beauwh

In reverse order yes would top up or preferably change the Fuel pump oil, there are 3 plugs, filler on top level plug at the side and a drain plug underneath, they are in the front section not the diesel section. the 3 plugs are pointed out in the manual. I think what ever oil you use the engine will be OK.

I don't want to teach you to suck eggs, but you don't say what you have open when operating the lift pump, are you opening bleed nipples, first on the top of the filter, front and then back, and then the injection pump. the lift pump can't work if there is no where for the fuel to flow to go.

I haven't had any suggestions for what to do with my injection pump, but looking else where on the web I have seen suggestions that WD 40 can be good at freeing off sticking pump parts, so I have removed the side inspection plate and given the rack and springs a good squirt, as well as trying to get some down the holes of the 2 output ports which aren't working. I'll give it the weekend to soak in but if that doesn't do it then I think I will have to take it off and take to the experts to sort out. Apparently leaving the pump drained of fuel and in air is enough to allow moisture in and very minor corrosion to form between the closely fitting parts.

Any other thoughts on my sticky pump

[Tubal Cain]

I suspect that you may have two plungers which are stuck, hence no output. The fact that the rack is stiff or sticking would confirm this. Pouring WD40 down the discharge ports is unlikely to work as there are non return valves fitted above the plungers.

I think that you may have to bite the bullet and take the pump to a specialist and have it refurbished.

Gerald