Diesel Bike Diary

[gilburton]

Sounds like they are gummed up or have corrosion so I think you are getting close to stripping them down.
If you have any to hand some sort of carburettor cleaner might work ??
Diesel fuel is quite a good cleaner itself but if you have already filled the plungers with fuel and worked the plungers then I think a strip down to clean them out is the only option.
It's the sort of thing that sometimes happens with brake cylinders but obviously injection components are a much closer fit so a strip down and a good soak should be enough.
Not sure about the timing but they must have some sort of markings or are fixed by a peg or similar but either way you cold always mark the components?

[Tetronator]

I have just filled the injector pump with carb cleaner.

I had also figured that carb cleaner might work. Stripping down might not be an option due to all the bolts beeing stuck.

[Tetronator]

Well then I managed to get all the injector pumps supplying diesel and bleed the fuel lines.

But it still doesn't want to run...

Also I've got smoke coming out of the oil fill hole...

https://youtu.be/OrOP4_TA6wc

[alexanderfoti]

IS your decompression lever set to decompress?

And, are you getting fuel from the injectors?

[Tetronator]

IS your decompression lever set to decompress?

I do not think it has one...

And, are you getting fuel from the injectors?

Erhm, I think so? Their being supplied by the pumps at least.

[Nanko]

Smoke out of the oilfiller cap means severe pistonring leakage.
Result not enough compression to ignite the fuel.
Somehow you you have to start the engine and let it run for a while.
Adding about 25% atf oil helps to dissolve carbon between piston and ring.
Spray some ether in the intake while starting.
Or use your petrol bike to turn over the kubota, push the rear tire against the flywheel.(if possible)

[alexanderfoti]

IS your decompression lever set to decompress?

I do not think it has one...

And, are you getting fuel from the injectors?

Erhm, I think so? Their being supplied by the pumps at least.

Its here, and not spring loaded so may be stuck open.



Im wondering if this is the cause of smoke out of the filler cap, depending on how the decomp lever works.

If not, then the smoke isn't a good sign, but the starter sound doesn't sound like you have 3 cylinders with good compression

[coachgeo]

Glow plugs? Have not heard any mention of them. On an engine that has not been started in so long I would make sure glow plugs are for sure assisting in the fire up. Soooome... maybe... I think.... very few D722's did not have glow plugs but think these received warmed water from another source (vehicle engine) that prewarmed the engine first so glows were not really needed cause whole engine was good and hot before starting.

[Tetronator]

Smoke out of the oilfiller cap means severe pistonring leakage.
Result not enough compression to ignite the fuel.
Somehow you you have to start the engine and let it run for a while.
Adding about 25% atf oil helps to dissolve carbon between piston and ring.
Spray some ether in the intake while starting.
Or use your petrol bike to turn over the kubota, push the rear tire against the flywheel.(if possible)

Yeah, I figured that might be the problem here. So I filled the cylinders with WD-40 and let it soak overnight, find out of that helped today.

IS your decompression lever set to decompress?

I do not think it has one...

And, are you getting fuel from the injectors?

Erhm, I think so? Their being supplied by the pumps at least.

Its here, and not spring loaded so may be stuck open.



Im wondering if this is the cause of smoke out of the filler cap, depending on how the decomp lever works.

If not, then the smoke isn't a good sign, but the starter sound doesn't sound like you have 3 cylinders with good compression

Intresting, mine doesn't have one. (https://www.youtube.com/watch?v=0j1iHy1R7ys)

Glow plugs? Have not heard any mention of them. On an engine that has not been started in so long I would make sure glow plugs are for sure assisting in the fire up. Soooome... maybe... I think.... very few D722's did not have glow plugs but think these received warmed water from another source (vehicle engine) that prewarmed the engine first so glows were not really needed cause whole engine was good and hot before starting.

I've been treeing to get those to work but I cant even get them out of the engine to inspect them sadly enough.

[alexanderfoti]

So yours is version without hmm. I couldn't see any diesel squirting out from the injector union on your last vid.

Are you getting spurts of fuel from the injector pipe when loosening the nut and cranking?

[Tetronator]

That's an old video, I just grabbed it to show you I don't have a decompression lever. I managed to fix the stuck injector pumps.

[gilburton]

You don't have to get the heaters out to test them just put a meter across them and you should get continuity. They either work or they don't.
Join them together with a thick wire and when you are ready to try starting hold the wire to your battery for app. 10 secs. them immediately remove the lead and try to start the engine.
The "smoke" from the filler could be the bore or valves. Either wear or things just being stuck from lying.
You have to think "agricultural" with these engines and "force" them to start by any means eg easy start or spin it over faster.
Once it is running it will settle down.
Just a thought but as it came from a truck it is 12v and not 24v??

[Tetronator]

Its 12v, I'll see what I can do but this engine might be to far gone. Which means its going to come apart completely for an overhaul. Which was the plan anyway as I'm going to try to get more power out of it.

I'd just like to see if it will even run.

[UAofE]

Adding about 25% atf oil helps to dissolve carbon between piston and ring.

Please do not support that myth. ATF has absolutely no place inside an engine!

Decompression systems open the exhaust valve, you have air passing into the crankcase which means your engine is no good. I suggest you find a replacement rather than wasting more time on a dead engine.

[Tetronator]

Engine! #6
Date: 10-7-2015

Well then I gave it one more shot.

Checked the glow plugs for continuity again, check out fine, almost no resistance.
Cylinders were filled with WD-40 the day before, so plenty of starting fluid I would think.
Glowplug hooked up and waited about 10 seconds before starting.

Result;
https://youtu.be/EdONOSyID4Q

Disappointment.

[alexanderfoti]

I still think there is a fuelling issue, If I start mine without plugs it creates a large amount of diesel vapor smoke. I would expect to see that on yours

If the pump was jammed up, its not too far to think that the injectors are also jammed closed.

[Tetronator]

It would've fired up on the WD-40 alone dont you think?

[alexanderfoti]

It wont if its not hot enough

[Tetronator]

The glowplugs were hooked up.

[BertTrack]

That amount of oily air out of the crankcase is alarming i think?

[alexanderfoti]

I think you need to start looking at compression. May as well get the head off. You might find some bits are stuck in the valves keeping them open.

[Tetronator]

Yeah I figured as much. Finishing up my workplace to fecilitate that.

[Nanko]

Impossible to use your petrol bike as startmotor ?

[Tetronator]

Possible but to dangerous for my taste.

[Nanko]

Possible but to dangerous for my taste.

Said the fearless dutchman

[Tetronator]

Possible but to dangerous for my taste.

Said the fearless dutchman

Fearless, not stupid.

Don't fancy my chances running a belt over my rear tire onto the pulley of the kubota. VT600's are chain driven.

[Eddy Wane]

When I tried to fire up my Lombardini I could turn the engine over by hand which suggested low or no compression. The engine would not start when only fuelled with diesel but once brake cleaner (easy start) was squirted into the air intake it burst into life running very roughtly bellowing out black smoke. I had to do this a couple of times until the motor finally started normally and lo and behold compression had come back. It seemed as it had sticking rings. I hope your engine only has a similar fault which may right itself.

[Tetronator]

When I tried to fire up my Lombardini I could turn the engine over by hand which suggested low or no compression. The engine would not start when only fuelled with diesel but once brake cleaner (easy start) was squirted into the air intake it burst into life running very roughtly bellowing out black smoke. I had to do this a couple of times until the motor finally started normally and lo and behold compression had come back. It seemed as it had sticking rings. I hope your engine only has a similar fault which may right itself.

Tried it, as in, blasted the intake with carb cleaner, nothing.

So I pulled the head!... ...And found something really interesting...


From flywheel to waterpump




It looks like its been honed-out already, what do you guys think?

[gilburton]

Looks good to me and the pistons are clean.
The next thing to look at would be the valves.
If they are ok I'd be looking at the timing.

[Tetronator]

Looks good to me and the pistons are clean.
The next thing to look at would be the valves.
If they are ok I'd be looking at the timing.

I doubt it's the timing. I'm having compression loss somewhere. (It was ridiculously easy to turn over by hand to be honest...)

I remember having to really smash an kickstarter at the rally.