Kubota BX24 Injector pump problem

[cal1]

My owners manual says to change the fuel filters every 500 hours so when the local dealer tried to tell me to change them every year. I thought "yea right, just trying to make extra $". Seems like you guys are saying once a year also.

My hourly use on an annual basis is really low, probably less than 100 hours. Should I be changing once a year?

 

[Max Power]

My owners manual says to change the fuel filters every 500 hours so when the local dealer tried to tell me to change them every year. I thought "yea right, just trying to make extra $". Seems like you guys are saying once a year also.

My hourly use on an annual basis is really low, probably less than 100 hours. Should I be changing once a year?

...a fuel stabilizer might be of more benefit. most of these units have a clear sediment bowel. Diesel fuel should be clean and bright and this is visible in the sediment bowel. So if it is clean and bright and no sediment then what exactly will you accomplish by changing the fuel filter.

I personally don't believe in over servicing. I need a reason to exceed the manufacturers recommendations. ...like dirty fuel or really old fuel or visible water.

cheers

 

[Deano]

My owners manual says to change the fuel filters every 500 hours so when the local dealer tried to tell me to change them every year. I thought "yea right, just trying to make extra $". Seems like you guys are saying once a year also.

My hourly use on an annual basis is really low, probably less than 100 hours. Should I be changing once a year?

I say yes. I change mine every 100 hours regardless. Cheap insurance! :thumbsup:

Deano

 

[Max Power]

I say yes. I change mine every 100 hours regardless. Cheap insurance! :thumbsup:

Deano

lol

good tires and windshield wipers are good insurance.

I don't put fuel filters in that category. If you have bad fuel you may need to change the filter every week. If you have good fuel then you risk introducing dirt into the system.

...if it makes you feel better go for it.

 

[dodge man]

BX's have no filter bowl. They also have very small filters. I'd agree with changing them more often, maybe every 100 to 200 hours.

 

[kuboman]

My owners manual says to change the fuel filters every 500 hours so when the local dealer tried to tell me to change them every year. I thought "yea right, just trying to make extra $". Seems like you guys are saying once a year also.

My hourly use on an annual basis is really low, probably less than 100 hours. Should I be changing once a year?

Once a year may not be necessary, depends on the quality of the fuel. Just remember every time you open the fuel system there is the potential for dirt to get in.

 

[kuboman]

amen ...... bio-diesel is not ready for the market.

here is the Kubota bulletin on it.

Kubota Engine America - Compact Diesel Engines

So why are we putting this crap in our diesel. There is another thread somewhere on this forum about fuel additives. Yet another reason to use a good additive.

 

[Chilly807]

As to the relative performance of the two types of injection system...

Indirect injection means only that the fuel spray does not go directly into the combustion chamber, but rather into a pre-combustion chamber. There is still a high pressure spray of atomized fuel, but it is in a fairly narrow cone shape. This is because of the nozzle design, called a "pintle-type" nozzle.

With a direct injection engine, the tip of the injector actually extends slightly into the combustion chamber, and has multiple small holes (usually 4 or 5) for the fuel to spray through. It will be seen as a fine mist radially distributed in 4 or 5 sprays around the tip of the injector. This is called a multi-hole nozzle.

It's possible there is still a bit of air left in the hard pipe injection lines, which is why there is no visible spray into the mason jar. A small engine like this doesn't move a lot of fuel, even at start-up when it gets max volume delivery.

It may take 20 seconds of cranking time to actually get fuel out of the new injector until the system is fully bled. I would try loosening the new injector on the fuel line by a few turns, then crank the engine until you get fuel coming out where the line is loose. Stop cranking and immediately re-tighten the line and try again for at least 10-15 seconds. If nothing then, re-loosen the line and repeat the process.

It's possible you have injection pump problems, but the fact that it did this before and then started and ran fine after you fiddled with it, then re-occurred makes me wonder if it's not simply getting airlocked for some reason.

The injection pump has what are called "delivery valves" in the top of the pump which act as check valves to maintain a certain line pressure between injection cycles to reduce lag time when building enough pressure to open the injectors for each injection event. If the pump can make enough pressure to open these, and yet not enough to operate the injector, it's possible but not a common defect. In fact, I've never seen it happen before.

And for all the elements to be equally worn to this point at the same time is not likely either, ordinarily we'd see one or two damaged and not pumping, but not all of them.

I assume the glow plugs are working correctly?

Sean

 

[fred98050]

UPDATE:


Injector pump is bad and needs to be rebuilt. Internal water corrosion....

History:
The tractor is a 2006, it has 980hrs always garaged and the Kubota fuel filters have been replaced every year as well as air filter. Also used Marvel Mystery Oil religiously (recommended by local dealer)... Never used Biodiesel either.
Might have had some bad fuel at one time, I really don't know why this has happened..It's not like the tractor was ever sitting there unused for more than a few weeks.

What I know now:
- If you see fuel squirting out of injector pump outlets, it doesn't mean that the pump is good. Hook up one (working) spare injector to one line and see if you get some spray. If not. Then the pump isn't working right.
- I am replacing the original fuel filters with better ones and will use water prevention additive.
- I am also relocating the electric fuel pump in engine compartment. Too much of a pain to access (nothing to do with current problem tho)..
-New injector pump cost $860 + tax. Rebuilt cost is between $350 to $800 depending on damages.

 

[radioman]

yikes!! that really gotta hurt on price. Glad you got it figured out though.

I am just glad I use the white bottle of power service. it says it disperses water.