KUBOTA ENGINE STALLING
- Thread starter VERNONB
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Lawnranger
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- Apr 18, 2012
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What have you checked so far?
i TOOK IT TO A DIESEL MECHANIC BECAUSE IT WOULD NOT START AFTER A WHILE. IT WOULD TURN OVER AND COUGH AND BLOW OUT BLACK SMOKE. SO HE SAID IT WAS THE BATTERY, THEN THE STARTER, THEN FUEL FILTERS AND THEN THAT IS NEEDED TO HAVE THE ENGINE OVERHAULED. SO WE DID ALL THIS AND I GOT IT BACK AND IT WOULD START AND MOW GRASS,BUT IT SEEMED TO BOGG DOWN IN WHAT WAS FAIRLEY HIGH GRASS. SO I JUST MOWED THE GRASS THIS WEEKEND AND IT GOT WORSE AS I WENT ALONG AND BY THE TIME I FINISHED THE 1 ACRE OF GRASS IT WAS BOGGING DOWN JUST DRIVING IT AROUND THE HOUSE WITH THE PTO DIS-ENGAGED.
Sorry, I didnt mention that i also replaced the air filter and both fuel filters, I'm leaning toward the injector pump being out of time or a bad injector. When I crack the fuel tubes at the injectors the middle one makes no differance.
On some of the Kubota engines there is a small prime lever by the fuel injection pump. This is used when and if you run out of fuel to purge the air out of the fuel lines that go from the inj pump to each cylinder. This lever has a detent that will over ride the cam that activates it. make sure that this lever (if your engine has one) is free and not in that detent.
I will check that when I get home tonight. Thanks for the suggestion. Any are welcome at this point.
I will check that when I get home tonight. Thanks for the suggestion. Any are welcome at this point.
I've worked on a few diesels over the years , mostly farm tractors and some big rigs. I wonder about the skills or lack of with the mechanic who went through everything including a starter and a rebuild and still didn't solve the problem! Don't try to adjust the fuel injection pump or take it apart as it's for an injection shop ONLY to deal with. Just the acid alone on your fingers would render some of the internal parts useless due to corrosion on a microscopic level! Like the other mechanic said, just use the primer lever to pump up the lines, then crack them at inlet to the injectors. Odd how that middle one had no effect. I'[m assuming you cracked the line at the injectors while the engine wasn't running? Could possibly be an air leak on the suction side of the pump up to the filters and up to the tank. Might pressurize the tank with a few pounds of air pressure and see if you can find any leaks. What the air suction does is cause cavitation and compressing air with fuel and would severely cut out if not quit outright. Also be careful when you're cracking the lines with the engine running at the injectors as that fuel coming out of the pump is at HIGH PRESSURE and can penetrate your skin and cause problems, so keep your fingers and hands clear of any spray. You can NOT have ANY air in a diesel fuel injection system! Hope this helps.
+1 Daves post.
If you do "not" have a prime lever, you can loosen the fuel line at the injector, (start with the longest one first) have someone crank the engine until fuel is running out with no bubbles. Tighten that line, and move to the next (longer) fuel line, and repeat the process until all the lines have been purged of air.