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Reload this Page Kubota D640 black smoke
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  #1  
Old 10-18-2019, 02:53 PM
Lucky's1782 Lucky's1782 is offline
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Default Kubota D640 black smoke
I have a 1782 with a Kubota D640. Engine will barely run and belches HEAVY black smoke. The injection pump was faulty and has been replaced with a rebuilt unit. Injectors have been rebuilt as well. Also the throttle seems to have no effect on engine speed. I'm not sure where to look next. Any help would be greatly appreciated!
Also does anyone know where I could download a sevice manual for this engine?
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Old 10-18-2019, 03:23 PM
R Bedell R Bedell is offline
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First, welcome to OCC............

Don't have the Service Manual for the D640, but we do have one for the D600. It is here........... D600
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Old 10-18-2019, 03:39 PM
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cooperino cooperino is offline
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Take the air cleaner out and try it. Black smoke is un-burned fuel. A restricted air filter can cause this.
Next I would question timing. After that I would start looking into compression.

Edit. Is this a turbo charged model?? A bad turbo will also cause the condition you mentioned.
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Old 10-18-2019, 09:15 PM
Lucky's1782 Lucky's1782 is offline
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First off, thanks for the input!
Been running this in a clean environment with the air cleaner off. I will pull the injectors and do a compression test tomorrow. Would like a service manual to know the specs. BTW, valve clearance was adjusted (some were way off) and didn't change anything. I'm wondering why the throttle lever doesn't have any effect? Maybe engine doesn't get up to speed for the governor to take effect?
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Old 10-18-2019, 09:18 PM
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cooperino cooperino is offline
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Quote:
Originally Posted by Lucky's1782 View Post
First off, thanks for the input!
Been running this in a clean environment with the air cleaner off. I will pull the injectors and do a compression test tomorrow. Would like a service manual to know the specs. BTW, valve clearance was adjusted (some were way off) and didn't change anything. I'm wondering why the throttle lever doesn't have any effect? Maybe engine doesn't get up to speed for the governor to take effect?
Where did you get the rebuilt injector pump from?
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Old 10-18-2019, 09:23 PM
Lucky's1782 Lucky's1782 is offline
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Also I would need a manual to check injection timing, but the camshaft has never been touched. It is a normally aspirated engine.
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Old 10-18-2019, 09:26 PM
Lucky's1782 Lucky's1782 is offline
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Got the pump from grainfarmer.com in montana
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Old 10-18-2019, 09:50 PM
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Originally Posted by Lucky's1782 View Post
Got the pump from grainfarmer.com in montana
How was it running prior to changing injectors and pump.?
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