Go BottomKubota Engine Knock 4310
 | fnemo1
Join Date: Jul 2005 Posts: 4 centerburgh,ohio 
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2005-08-01 114194
need some help,at work i have a 4310 kubota,after running it for some time the engine starts to knock and blows black smoke,they use it to blow leaves,i changed the fuel and air filters and changed the oil, any thoughts will be very helpfull, thanks
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 | oneace
Join Date: Mar 2004 Posts: 1490 south central pa 
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2005-08-01 114200
Sound like the engine might be ready to puke out. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York 
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2005-08-01 114202
Some injector's when getting plugged will offer an engine knock that could sound like a rod is about to come through the block. You didn't say how this happens or how long you need to run it to make it happen or at the rpm. We do need more info! ....
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| fnemo1
Join Date: Jul 2005 Posts: 4 centerburgh,ohio
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2005-08-01 114210
Hi Art, Hi Oneace,
Well it happens when they are using a blower hooked to the pto,Knowing them it's running at full throttle,he ran it for 4 hrs. before it started to act up. when I changed the fuel filter I noticed a lot of black debri in the filter,it was just changed 1 month earlier,i did drain the tank and it was clean,I took it out,and it ran fine but not that long of time or that high rpm,should i try a good injector cleaner! I hope this info helps thanks again ....
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| oneace
Join Date: Mar 2004 Posts: 1490 south central pa
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2005-08-01 114216
The black debris is more than likely algae. Get some fuel treatment that has algaecide and injector cleaner. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-08-02 114234
I think Ace is on the right track, if the engine was about to grenade the knock wouldn't take 4 hours at full throttle to show up.
If the filter was really dirty it's possible (likely?) that some crap got past it already. It may require the pump & injectors to come out be thoroughly cleaned.
Best of luck. ....
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| fnemo1
Join Date: Jul 2005 Posts: 4 centerburgh,ohio
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2005-08-02 114252
Thanks everyone,Ill go ahead and get some injector cleaner and fuel treatment and give it a try,if that does'nt work,then i will pull them apart and clean. thanks again
fnemo1 ....
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| oneace
Join Date: Mar 2004 Posts: 1490 south central pa
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2005-08-02 114254
I would not go taking the injection pump apart or even off the engine your self. there are very specific timing procedures that need to be followed before the pump is removed or disassembled. ....
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| fnemo1
Join Date: Jul 2005 Posts: 4 centerburgh,ohio
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2005-08-02 114263
No Problem thanks ....
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