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Kubota zb-600c-1 fuel problems


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#1 Paradox1559 OFFLINE  

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Posted April 12, 2018 - 07:37 AM

Can anyone help me figure the fuel system out on this motor? It trys to start if I mist it with starting fluid, but I can't get it to kick otherwise.
I attempted to bleed the injectors, and one spurts good, while the other kind of sweats. It's possible fuel just hasn't gotten to it yet. I would think it would still try to start on that one cyl though.

There was a little water in the fuel system as well, but it was mixed in with diesel.
Any tips or info/manuals, would be greatly apreciated. I don't want to have to rebuild the pump, but if I do could someone help me source cheap parts?

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#2 Trav1s ONLINE  

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Posted April 12, 2018 - 07:57 AM

http://www.kubotaeng...rch?q=zb 600c 1



#3 Trav1s ONLINE  

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Posted April 12, 2018 - 08:00 AM

https://www.ebay.com...IwAAOSwfrJZwlYE



#4 Trav1s ONLINE  

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Posted April 12, 2018 - 08:09 AM

The basics of all diesel engines are the same: Compressed air gets hot and inject fuel into combustion chamber. (obvious stuff I know)

 

If the mechanical parts are working (pistons and valves move in time) then the fuel system is the next step. Three things come to mind as I read your post: Fuel filter, fuel pressure, and dirty/bad injectors

 

 

This is where I would begin...
 

Is there a filter in place?  Is it plugged enough to prevent the pump from getting the necessary fuel?  If you bypass the filter does it run?

What is the pressure on the output side of the pump?  (Low pressure will impact the spray pattern of the injectors which will impact firing.)  

 

Are the lines free and clear between the pump and the injectors?

 

 

Does it have glow plugs? Are they working??


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#5 Paradox1559 OFFLINE  

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Posted April 12, 2018 - 08:11 AM

I no longer have a filter on it, for now. I have a clean plastic tank supplying fuel. I haven't taken much apart. I've only tried bleeding the lines.

#6 Cvans ONLINE  

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Posted April 12, 2018 - 10:05 AM

First of all the injector pump was never designed to suck fuel. This is why many diesels have a small electric or mechanical lift pump between the fuel tank and the injector pump. If you are using a temporary fuel tank make sure it is mount higher than the injector pump. You will need to purge the air out of all the fuel lines before and after the injector pump before you will get proper fuel delivery. It can take a while to clear all the lines of air so be patient. This is the reason you don't want to run a diesel out of fuel.

Once you get the hang of it there's not much to it. 

Quit using starter fluid before you damage your engine. 


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#7 Paradox1559 OFFLINE  

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Posted April 12, 2018 - 10:22 AM

Well, ill continue bleeding and update accordingly

#8 chieffan ONLINE  

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Posted April 12, 2018 - 12:36 PM

You mentioned a little water in the system but was mixed in with the diesel.  Water in diesel does not work any better than water in gas. Need to get rid of that fuel and put in fresh clean fuel.  Flush the lines up to just where it enters the injector pump.  The pump may have a bleeder valve on it.  If it does open it and purge the lines through the pump.  Then go to each injector and bleed the air out.  Cvans covered it real good.  Get the manual and it will show you where parts are located, etc.


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#9 pryan05 ONLINE  

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Posted April 12, 2018 - 05:00 PM

Also my kubota will not hit a lick without being preheated by the glow plugs.


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#10 Paradox1559 OFFLINE  

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Posted April 15, 2018 - 11:11 AM

IT LIVES!!!!! muahahahaha

It has a mind of its own. Once it woke from its slumber it let out a mighty roar. It roared so loud that it was out of control. I attempted to silence the great beast, but it only made it angrier. Alarmed, I wielded my trusty shop rag and smothered the beast into submission. I now sit in the shop asking; why......


(Engine started, then ran away. The "off switch" did nothing..)

#11 olcowhand ONLINE  

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Posted April 15, 2018 - 11:15 AM

The crankcase breather system may be the issue and it's running off oil fumes.  Older diesels just vented to the atmosphere, but most now have a check valve system that burns them.  If the reed or whatever the breather system uses is broken, it can & will run on wide open.


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#12 Paradox1559 OFFLINE  

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Posted April 15, 2018 - 11:39 AM

Where might I find that?

#13 olcowhand ONLINE  

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Posted April 15, 2018 - 01:22 PM

Where might I find that?

 Usually in the valve cover.  Larger engines still often utilize atmospheric breathers....at least my older ones.   I've never worked on a single cylinder or ANY air cooled diesels, or a unit such as yours.  My Perkins "shibaura built" 2 cylinders have the breather in the valve covers that recycle crankcase fumes.  Always worries me they will cause run-away some day.



#14 Paradox1559 OFFLINE  

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Posted April 15, 2018 - 02:52 PM

It's actually Water cooled. And a 2 cylinder. I think the governor is stuck. The metering arm hooked to the governor "clutch" doesn't move at all.

#15 olcowhand ONLINE  

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Posted April 15, 2018 - 04:00 PM

It's actually Water cooled. And a 2 cylinder. I think the governor is stuck. The metering arm hooked to the governor "clutch" doesn't move at all.

Yes, I seen it has the self contained radiator.  Never worked on such a unit, or even seen one up close.  That stuck arm sure would do that!  






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