Dumper restoration

[Studu]

Not sure if I have got this right but can anyone identify this diesel fuel pump. The numbers on the plate do not seem to tally with the ones being quoted for a Petter AVA1

[cobbadog]

Hi, I am not familiar with these engines but what happens if you cross reference the number on this injector to what you feel is the correct one? Sometimes if another brand is used the numbers can be different but may cross reference with say a CAV model pump. Not a lot of help for you here and now but hopefully someone will pop up and offer the correct information for you.


I just went back a page to read your last post. What you are seeing as a tiny dribble may be correct. I too thought the same thing when I did my Lister and the dribble that came out was not much and thought it may need a dose of Viagra to stop dribbling on the feet. However, it was correct and the issue in my case was the injector nozzle. Can I suggest that you pull the injector out and then connect the fuel line loosely to the injector and crank the engine over on full throttle. Crank it until you get the fuel line full of fuel with no air and then tighten the connection to the injector. At this stage you should get the atomisation spray of fuel. If not there is a blockage inside the injector.
That tiny dribble once at the nozzle converts to a very high pressure and is what causes the fuel to atomise. If not the nozzle is blocked and do not poke anything into the tiny holes, that destroys them. You can use ultrasonics to clean them or get exchange nozzles if they are removable.

Hope this helps you out.

[essexpete]

Be careful with the spray off the injector. High pressure fuel can penetrate skin.

[Stewhig]

Thanks Cobba, that is really helpful. It might save me buying a new pump. Like you said it is ejecting a pathetic ejaculate which may in fact be the correct dose when atomised.
Now I just have to wrestle with the injector and try to get it off - its fossilised in the block!!

[cobbadog]

As essexpete states, be very careful with the spray once it does happen. It will penetrate the skin, is painful and not good for your system only good for running engines.
Be patient when removing the injector if there is corrosion around it. Soak it with penetrating oil of some kind, scrape away as much as possible and if you can make or buy a puller to remove it so that it is pulled straight out of the hole and not on an angle. I can show you a pic of what happens if it is not removed properly from an old crude oil engine I am doing up at the moment. Previous owner thought he knew what to do but snap it went. He gave the engine away to me becasue of the injector is so hard to find never mind buy one. It only took 4 years but I found one and then I spent around 3 weeks trying to get it apart to clean it up, finally got it finished today.

[essexpete]

As essexpete states, be very careful with the spray once it does happen. It will penetrate the skin, is painful and not good for your system only good for running engines.
Be patient when removing the injector if there is corrosion around it. Soak it with penetrating oil of some kind, scrape away as much as possible and if you can make or buy a puller to remove it so that it is pulled straight out of the hole and not on an angle. I can show you a pic of what happens if it is not removed properly from an old crude oil engine I am doing up at the moment. Previous owner thought he knew what to do but snap it went. He gave the engine away to me becasue of the injector is so hard to find never mind buy one. It only took 4 years but I found one and then I spent around 3 weeks trying to get it apart to clean it up, finally got it finished today.

Good work with patience Cobba

[Studu]

Petter AVA! Single cylinder diesel. I have rebuilt the top half of the engine - cleaned fuel tank and filter, removed cylinder and piston, cleaned and lapped the valves, new gaskets, new piston rings, new fuel injector, serviced the fuel pump etc but it still will not start. Followed guidance in the manual to start it and there seems to be compression when it turns.
Apart from being very cold is it adjustment? There is a screw on the top of the fuel injector assembly which I have fiddled with. Could it be this and if so how do I rectify it? Or is it valve clearances? Should I try damp start spray?
It may be that I have just not bolted it back together properly as I have nil experience.

[Jeremy Rowland]

Petter AVA! Single cylinder diesel. I have rebuilt the top half of the engine - cleaned fuel tank and filter, removed cylinder and piston, cleaned and lapped the valves, new gaskets, new piston rings, new fuel injector, serviced the fuel pump etc but it still will not start. Followed guidance in the manual to start it and there seems to be compression when it turns.
Apart from being very cold is it adjustment? There is a screw on the top of the fuel injector assembly which I have fiddled with. Could it be this and if so how do I rectify it? Or is it valve clearances? Should I try damp start spray?
It may be that I have just not bolted it back together properly as I have nil experience.

See what Cobba has said above; remove the injector and connect it back up with the feed pipe from the pump and turn the engine over; make sure you keep well away from the injector as atomised fuel can pass through the skin, you should see a fine mist from the fuel injector, let us know how you get on.

Jeremy

[Matchless?58]

Have you checked the spill timing ?

[cobbadog]

As suggested pull the injector out again, this time it will be easy, then re-connect it and crank away to see that you have a nice atomised spray. If you dont then you may need to have the pump re set at the nominated pressure using a bench tester and check at what pressure it is 'cracking' open. Looking at the piece at the top of the injector I think that is simply an adaptor for the fuel line and should not alter anything inside.

Did you pull this pump apart?

Although I have not done the step of setting or checking 'spill timing' I believe the steps are straight forward and is a similar step to setting ignition timing on a petrol engine.
During the re-assembly of the top end are you sure of the correct valve clearances and that the decompression lever is not holding open any valve?
With all the new parts inside it should be tight to turn over compression, if not something is letting it out.