View Full Version : kubota smoking

01-10-2012, 11:25 AM
I have a Jacobsen Turfcat 2 older mower with a Kubota 3 cyl diesel engine ,950 D. I have a problem when it starts it smokes for about 5 min, then clears up and I can run all day no problems till you shut off and try to start again then same thing happens even warm.
I was told the injector were bad , had tested and 1 was so I replaced all 3.It did't male a differance.
I tried adding stuff to oil and fuel and did't help, any help would be apprecited.

01-10-2012, 06:13 PM
how many hours are on this engine? is it getting harder to start in the mornings? has it ever been introduced to Starting Fluid? And lastly, when was the last time you changed air and fuel filters? and also is the oil runny? My deisel mech is out sick but i might be able to point you in the right direction.

01-10-2012, 06:16 PM
off the top of my head im thinking bad valve seals, or even slightly out of timing.

01-10-2012, 06:52 PM
I don't know how many hrs,alot. The fuel and air filters have all been replaced and I have never used starting fluid on it.
The olil seems ok. Someone told me when its smoking to loosen one injector feed line at a time and when I got to center one and loosened it , the smoking stopped and as soon as I retightened it it smoked again.

01-13-2012, 11:10 AM
guy in my shop says have the fuel pump checked out, may have oil blowby getting into the fuel, depending on the pump it may only get it into 1 line and not all 3. he mostly works on Cat engines nd has never messed with anything Kabota. says it could be something as simple as an o-ring/seal in the fuel pump.
he also agreed that it most likely is a bad valve seal on that cylinder, it would mostly smoke at startup and sometimes a puff of smoke here and there once it clears up depending on how bad it is. he also stated that with the fuel injector loosened that it prolly was not firing, thus no burning of oil.
He said start with a pressure and leak down test on all cylinders, noting any difference with the cylinder in question, it may just be worn out.

01-13-2012, 11:42 AM
Thanks will check out