Oil & Fuel correct idle speed bx diesel engine d902

ampsucker · Mar 5, 2008

did a search, couldn't find in manual. anybody know what the correct idle rpm for a diesel engine of this size should be? mine is running 1200-1400 which seems a bit high to me once warmed up.

amp

Jimbrown · Mar 5, 2008

http://www.tractorbynet.com/forums/kubota-owning-operating/40344-bx-22-tiny-tach.html

sqidget · Mar 5, 2008

Those speeds sound actually quite fine. I found my throttle cable was loose and increasing the idle speed. It went to 1700. The pump setting was around 1200. The injection pump itself has a setting with locktite on it. Do not adjust this while under warranty. I found that 1200 or lower shook the crap out of the tractor so I had to speed it up with the throttle.

ampsucker · Mar 6, 2008

ran across this during a brief bout of insomnia this AM.

If you have the option of setting the idle speed on your diesel engine, keep in mind that idling at low rpms (600 rpm) will reduce cylinder pressures and increase the amount of unburned fuel and carbon deposits, further accelerating the rate of engine wear. Idling at high rpms (1100 rpm) increases cylinder pressure for more complete fuel combustion, but you'll use more fuel due to the higher rpm. Either way, you can't win.

this is where i was headed with this post because i often have to leave the tractor periodically to do short tasks. during the cold weather, i had been leaving it running with the parking brake set to keep the hydraulic temps in the operating range. plus, i had always heard that truckers leave diesel engines running to reduce startup wear and thermal expansion/contraction wear.

i also notice that at a dead idle, the engine vibrates considerably shaking the whole front of the tractor but bumping up the revs a bit almost totally eliminates that. i was thinking of lowering the idle speed down out of the sweet spot (sour spot?) might also solve the vibration issues.

anyway, anybody who's lowered their idle speed please chime in on the results so i'll know if it's worth tinkering with.

thanks,

amp

mozark · Mar 6, 2008

I looked all over for this info, and finally found it posted on top of the engine. I would recommend keeping it on the high end of the range. The engine sure makes a lot of noise when it is set to the low end, especially when cold. I don't see how this could be good for it.

ampsucker · Mar 6, 2008

yep, sure enough, right there it is! 1300-1400 rpm.

mine starts up cold between 1050-1250 and gradually warms up into that range.

thanks!

lovemytoys · Mar 6, 2008

so you are say 1300-1499 rpm ????not higher???

steverichmond · Mar 6, 2008

When I first got my 2350, I thought it idled a bit fast. I asked the delivery guy and He said it was right where it should be and not to worry. It idles around the 1260 to 1320 range after it's warmed up and shakes some. I hope it smooths out after it gets broke-in.

mozark · Mar 7, 2008

My 2350 idled about 1500 when new, which seemed too fast to me also. I adjusted the throttle cable to lower it down to 1250 which turned out to be too low, so I readjusted it back up to about 1350, which seems fine when hot. I have gotten in the habit of bumping the throttle up slightly when cold starting and it seems much happier idling about 1500 until it warms up.