Diesel Bike Diary

[Tetronator]

If I were testing an engine I would have the fuel coming from the bottom of the can higher than the engine that way anything shows itself as a leak of fuel and air is ruled out. Secondly if the engine does not strike up straight away give it a squirt of easystart. Starter motors are only designed for really short periods of use.

The kubota manual specifically states that I definitely shouldn't use any kind of starting fluid. But I am now just treeing to bleed the air from the fuel lines.

Edit; I will try to hold the fuel can higher this time.

[Tetronator]

Engine! #3
Date: 8-7-2015

Well then, still no luck. Plenty of fuel coming out of the return line but nothing out of the pump.

https://youtu.be/lxhmXF2FTqE

[gilburton]

Put the injector pipes back on ( I think you are just sucking air back in) then just open the large nut on the fuel pipe on each injector one at a time.
Just loosen it half a turn until you are getting neat fuel while the engine is turning over on the starter.
It should try to fire if air is the problem.
I would then try a small amount fuel down the intake or easy start or even WD40.
It should fire and if your pump is faulty it might encourage it to work and clear any air in the system.
Easy start is not a good idea in the long term and too much can lock up the engine but this is a one off to prove a point so try it.

[alexanderfoti]

Agreed, put the pipes back on, I would check that the pump elements aren't stuck, sometimes happen when they have been sitting a while, but would be surprised if its all 3 at once.

Does the governor arm have resistance to it when pulled, it may be that the internal spring has broken or been removed.

The fuel coming out of the return line means that the mechanical lift pump is working.

[Tetronator]

Yes the governer arm does have tension.

[alexanderfoti]

I would remove the pump and check that the cam that drives it, is turning, and that the pump plungers aren't stuck in the up position.

[Tetronator]

Cant remove the entire pump. Allready broke off one bolt. I did however pull the guts out of each one till i got to the pungers and when i turned the engine over they did come up and down.

[Tetronator]

Engine! #4
Date: 8-7-2015

Right, I havn't got the faintest as whats causing this. I've pulled the injector pump guts out and cleaned them. I even checked if the plungers would come up and down while everything was disassembled and they did.

So I put everything back together and tried to bleed the air out of the lines again... Here's the result:

https://youtu.be/0j1iHy1R7ys

[gilburton]

Squirt some fuel or easy start in to the air intake

[Tetronator]

Just did that. Nothing.

I'm still treeing to get fuel trough the fuel lines, nevermind getting the darned thing to run.

[alexanderfoti]

# 10 - Engine! #4
Date: 8-7-2015
Status: Obtaining parts

Right, I havn't got the faintest as whats causing this. I've pulled the injector pump guts out and cleaned them. I even checked if the plungers would come up and down while everything was disassembled and they did.

So I put everything back together and tried to bleed the air out of the lines again... Here's the result:

https://youtu.be/0j1iHy1R7ys

Governer lever needs to go all the way , the other way

Edit: Atually, that seems to be the right end. Why is it sprung to full by itself, have you added a spring?

[gilburton]

The idea was that sometimes if you can get it to run it forces the fuel through as the engine is turning faster although you'll still have to bleed it.

[Tetronator]

# 10 - Engine! #4
Date: 8-7-2015
Status: Obtaining parts

Right, I havn't got the faintest as whats causing this. I've pulled the injector pump guts out and cleaned them. I even checked if the plungers would come up and down while everything was disassembled and they did.

So I put everything back together and tried to bleed the air out of the lines again... Here's the result:

https://youtu.be/0j1iHy1R7ys

Governer lever needs to go all the way , the other way

Edit: Atually, that seems to be the right end. Why is it sprung to full by itself, have you added a spring?

So do I pull it towards the flywheel side or the waterpump side?.... same goes for the cutoff.

[alexanderfoti]

You have an ever so slightly differnt layout to me, but mine is, full fueling is all the way to the water pump side, see below:



Mine is in the idle position there. My cut off lever is further down to the left.

[Tetronator]

Well I was holding the cutoff the wrong way around. But i tried bleeding the system again and that didn't help either.

(I looked up a working one on youtube https://www.youtube.com/watch?v=ssUMGDshrNY)

[alexanderfoti]

IT does seem as though your lever is the reverse of mine, it would be nice if mine was reversed as it makes wiring up a throttle a tad difficult.

[gilburton]

I can't compare it to anything I've had but there does seem to be a lot of fuel coming out of the return line.
Possibly the stop needs looking at??

[Tetronator]

I can't compare it to anything I've had but there does seem to be a lot of fuel coming out of the return line.
Possibly the stop needs looking at??

That's probably because I was pulling the stop the wrong way. But I still cant seem to bleed the fuel lines...

[BertTrack]

That's probably because I was pulling the stop the wrong way. But I still cant seem to bleed the fuel lines...

It would take a long time on my yanmar to fill the high pressure tube and that was a short pipe. Maybe you can tilt your engine so that all air from the high pressure pipes goes to the exit where you open it.

You could remove the injectors for the time being. And disconnect them from the injector lines and crank untill each pipe clearly is full. Then connect the injectors (carefull) and deair them. See if they spray and remount them. Also removing the injectors makes it easier to crank the engine for longer. I know..

No sticking body parts in the spray area. verboden!

[Tetronator]

That's probably because I was pulling the stop the wrong way. But I still cant seem to bleed the fuel lines...

It would take a long time on my yanmar to fill the high pressure tube and that was a short pipe. Maybe you can tilt your engine so that all air from the high pressure pipes goes to the exit where you open it.

You could remove the injectors for the time being. And disconnect them from the injector lines and crank untill each pipe clearly is full. Then connect the injectors (carefull) and deair them. See if they spray and remount them. Also removing the injectors makes it easier to crank the engine for longer. I know..

No sticking body parts in the spray area. verboden!

If I open up the injection pump while my fuel can is still up in the air like in the video a stream of diesel will come out of the injection pump. Just by gravity feed pressure, so I know its full and de-aired.
But when I turn it over, nothing comes out.

[BertTrack]

If I open up the injection pump while my fuel can is still up in the air like in the video a stream of diesel will come out of the injection pump. Just by gravity feed pressure, so I know its full and de-aired.
But when I turn it over, nothing comes out.

And the pipes all the way to the injectors aswell? If there is any pocket of air in the pipes behind the injection pump they will not work. You need to see a clear sharp pulse in the liquid everytime the pump has a stroke. No matter if it's directly on the pump side or at the exit of the injector piping.

[Tetronator]

If I open up the injection pump while my fuel can is still up in the air like in the video a stream of diesel will come out of the injection pump. Just by gravity feed pressure, so I know its full and de-aired.
But when I turn it over, nothing comes out.

And the pipes all the way to the injectors aswell? If there is any pocket of air in the pipes behind the injection pump they will not work. You need to see a clear sharp pulse in the liquid everytime the pump has a stroke. No matter if it's directly on the pump side or at the exit of the injector piping.

I think so, you can see me crack open the bleed nut leading into the injector pump coming from the fuel pump in the video.

[BertTrack]

I think so, you can see me crack open the bleed nut leading into the injector pump coming from the fuel pump in the video.

Idea:
Check for the pulses behind the injection pump as well see f it actually pumps (on the pump exit per cilinder).Then add the lines to the pump and fill those up and then connect them to the injectors and check the flow through the bleed line untill there is only diesel coming out. then bolt it all the way down to start?

[Tetronator]

Engine! #5
Date: 9-7-2015

Well then, I smell of eau de diesel but I've gotten the waterpump side injector to work VERY briefly.

What I'm thinking is happening is that the plungers are getting stuck once they reach the top of their stroke in the plunger barrel.



I have been pushing them back with an allen key and that seemed to have freed up one of them for a while but it got stuck again.

So anyone have a more permanent solution for this?

Also if I remove the assembly will I ruin the timing on my engine? I'm not really sure but I think it should be fine as they are inline and their being driven by a camshaft which is connected to a gear drive...
And with assembly I mean one of the 3 injection pumps, not the entire injector pump block.

[gilburton]

Maybe they just need a bit of lubrication and manually working them a few times to free them off??

[Tetronator]

Thats what I did.

[alexanderfoti]

Thats what I did.

I would keep doing that. I suspected the elements where stuck. Any idea on the history if the engine?

[alexanderfoti]

You won't mess with the timing if you remove the pump. Just make sure you replace any shims that sit between the pump and the engine.

[Tetronator]

Thats what I did.

I would keep doing that. I suspected the elements where stuck. Any idea on the history if the engine?

Righto will try again. Its been used as a trailer power unit for refrigeration. After it had been replaced with 750 Hours on it for a newer model it sat for 4 years.

You won't mess with the timing if you remove the pump. Just make sure you replace any shims that sit between the pump and the engine.

Yeah I guessed as much but another guy whose helping me seems to think differently.

[Tetronator]

Been going at it for quite a while now. The plungers are still noticably stuck at the top of thier stroke. Any miracle lube that will help the process?

https://youtu.be/5ui5ywvSf5I