Kubota fuel lines

[J-Mech]

I think your going to find that your injection timing is not correct. That thing cranks really fast for it not to start. The PC I'm at has basically no volume, so I'll listen to it again when I get back to the shop a little later..... but it appears from your description to be a timing issue. Black soot, long crank, high fuel consumption..... I bet you'll find it also is low on power. You may not think so, but wait till you get it fixed.

Also, don't keep the wire, or even hold the glow plugs on for longer than 30 seconds. Even that is a long time. You'll be upset when you swell one into the head from holding it on too long. BTDT (I didn't cause it, just fixed it. )


Post a pic of the side of the motor with the injection pump. Make sure there is good lighting, and the side panel is off. I want to look at something.
Also, a video of it running. Let it idle, then gag it to wot. Bring it back down, and do it again. Goose it a couple times, I want to hear how it rev's. Lets see if we can figure this out. TIA


Under edit: Nevermind on the vid. I found the one of you blowing snow. I'm staying with my though: Timing is off.

[gt383mag]

J would the timing be off from wear on timing gears or something? mine has never turned over that fast but still has original starter. your rite that snowblower vid looks like its down on power mine has around 900 hours also but is real good on fuel. when i had the blower on last year hardly ever lugged like that. and when it did it would clear out almost instantly when the load was reduced bauers dont seem to do that. i think he will be impressed with the power when we get it figured out

[J-Mech]

No, on these pumps the timing is a real PITA to set, or change. It is adjusted by the shims under the injection pump. About the only way it can be off, is if the pump has been removed, or it has excessive wear internally, such as the rollers or the cam in the pump. It may need rebuilt.

There are two other things that can make it have the exact same symptoms. One is a plugged or restricted air filter/ducting. But he said he already replaced the air filter, so I crossed it off my list. The other is weak charge pressure to the injection pump. That pump cannot suck at all, so it is dependent upon the charge pump.


I agree with you about the blower vid. Too much smoke, drags down easy and doesn't recover quickly when the load is reduced.


Under edit: I thought of something else that will cause those symptoms: If the fuel shut-off arm on the pump that is either on a cable, or an electric solenoid isn't adjusted properly. It is connected directly to the rack, and if it isn't opening all the way, it limits rack travel, thus causing the same symptom.

[J-Mech]

I'll also note that those cam box pumps are notorious for internal leakage from the plunger assemblies. They will leak fuel down into the cam area, washing the oil off the cam and making them wear out. On these diesels it's important (just like any engine) to keep an eye on the oil and make sure that it isn't getting fuel in it. Just like on the KT's and the Mag's with their fuel pump leaking internally, so will the Kubotas.

[Oak]

Wow, that thing is cranking way faster then any of mine. I'm just guessing but I'm thinking compression problems. Keep us posted.

I watched the vid again, just a thought, did you bleed the air out of the injectors. That D722 I picked up kinda sounded like that until I cracked the lines and bled them. It was smoking like that too until it fired off.

[J-Mech]

Originally Posted by Oak

Wow, that thing is cranking way faster then any of mine. I'm just guessing but I'm thinking compression problems. Keep us posted.

Not argueing with you Todd, but the way it's trying to start, I think it's making it crank easier. I actually meant to mention that earlier.

[Oak]

Ya, after watching that again that is what it may be doing. I changed my op after watching again. You type fast J.

[J-Mech]

Originally Posted by Oak

You type fast J.

I have the reflexes of a cat, and the speed of a mongoose!

[sbauerz28]

Originally Posted by J-Mech

I'll also note that those cam box pumps are notorious for internal leakage from the plunger assemblies. They will leak fuel down into the cam area, washing the oil off the cam and making them wear out. On these diesels it's important (just like any engine) to keep an eye on the oil and make sure that it isn't getting fuel in it. Just like on the KT's and the Mag's with their fuel pump leaking internally, so will the Kubotas.

Oh I don't like the sounds of that. I can tell you that the oil is over the full line on the stick. I'd say about 1/2" last time I checked it. Never thought much of it. I just figured I may have over filled it. Maybe I will drain it tonight and check it out.

[sbauerz28]

Originally Posted by J-Mech

No, on these pumps the timing is a real PITA to set, or change. It is adjusted by the shims under the injection pump. About the only way it can be off, is if the pump has been removed, or it has excessive wear internally, such as the rollers or the cam in the pump. It may need rebuilt.

There are two other things that can make it have the exact same symptoms. One is a plugged or restricted air filter/ducting. But he said he already replaced the air filter, so I crossed it off my list. The other is weak charge pressure to the injection pump. That pump cannot suck at all, so it is dependent upon the charge pump.


I agree with you about the blower vid. Too much smoke, drags down easy and doesn't recover quickly when the load is reduced.


Under edit: I thought of something else that will cause those symptoms: If the fuel shut-off arm on the pump that is either on a cable, or an electric solenoid isn't adjusted properly. It is connected directly to the rack, and if it isn't opening all the way, it limits rack travel, thus causing the same symptom.

I will get you some pics this afternoon when I get home. I'm thinking you want to see if any of the bolts look like they have been out. I'm almost positive this thing has never been apart. I can tell you there has never been a wrench on the injector lines. The nuts didn't have a single paint chip on them until the other day.

Not a restricted air filter for sure. It is new, just as you assumed. I even flushed the cooling system this past fall.

I know for a truck I would call it a lift pump. What do you think the pressure output should be for the electric pump? I would say that it don't have more than a few psi based on how the fuel flow out of the bleed screws. It kind of just runs out. It don't spray out.

In the blower vid it does seem down on power. It always acts like that for about 15 minutes or so until it warms up good. After that it seems to pick up power and smoke less.

When I got this tractor there wasn't a spring on the fuel shut off arm so it didn't open all the way. You can see it in my vid that there is a nice new spring pulling on the fuel shut off arm.

Off subject: That's the blower I resplined the fan on a few years back. Still works like a champ.