Starting Kubota

[gordon]

I believe that 90% of engine wear is from start up the first few seconds of running until the oil pressure builds.
this is why I leave the throttle down. On some of the older turbo-diesels its recomended to turn the engine over with the stop lever out to get some oil moving before starting.
now with prelubers and such on the new diesels its taken care of during the preheat cycle. Many different options here but to me high throttle at start up is a no no particles or not.
What kind of particles are they dirt or maybe algeeeee stuff/w3tcompact/icons/smile.gif

 

[Bird]

I was afraid to even guess./w3tcompact/icons/smile.gif But my kids learned at an early age that gunning an engine when it first started could be hazardous to their health if the old man heard it./w3tcompact/icons/smile.gif

Bird

 

[Anonymous Poster]

I think the speed control lever position when you are cranking is a moot question. Tractor engines have governors, and an engine that's not running, regardless of speed control lever lever position, will be calling for max fuel flow. Remember, the actual throttle on the injection system is really controlled by the governor. The orange speed controll lever tells the governor the desired RPM, and the governor adjusts the throttle on the injection system to attain that RPM. If the engine is not turning, or just turning at cranking speed, the governor will have the throttle full-open trying to get the engine up to speed, even if the control lever is only calling for idle speed.

A totally different question is how fast to run the engine once it starts. I'll stay out of that debate.

 

[MChalkley]

Phayden - Precisely the idea. I mentioned that point in a topic a while back when someone was pondering over the reason for the puff of black smoke when you start most tractors. The governor is the cause, for the reason you mentioned. However, the maximum amount of fuel the governor can allow into the engine is still determined to some extent (depending on the design of the injection pump) by the position of the throttle. Thus the requirement that some engines be started at half throttle or so when the temperatures are very cold.

Mark

 

[MChalkley]

Bird - Another stunt I love and would kill anyone who pulled it with anything I own for is the ol' "rev her up wide open then turn the key off" trick. /w3tcompact/icons/shocked.gif I've asked people why they do this and they either say it's because someone told them to or they're getting the oil circulating everywhere before turning the engine off. Yeah, right. Like how long do they think it would idle if the oil wasn't already circulating well? And why doesn't it occur to them that all they did was wash the cylinder walls down so they're guaranteed a good dry start next time, not to mention diluting the oil with the fuel? /w3tcompact/icons/frown.gif

Reminds me of the time my dad caught me doing something really stupid (I mercifully have forgotten what) and he just stood there so mad he couldn't think of what to say or not daring to say what he wanted to say - finally, after holding himself in check for a few seconds he said "Son, try to be as smart as you can, because dumb is awfully hard to hide." I remember that often. Sometimes I'm reminded by something I've done; other times I'm reminded by things I see other people doing. I work really hard trying to keep the former number smaller than the latter. /w3tcompact/icons/smile.gif

Mark

 

[Bird]

I couldn't agree more, Mark. I've known people who thought you should rev the engine and turn off the key "because it makes it easier to start the next time." As long as it wasn't not one of my engines, or one I was responsible for, I usually didn't even try to answer.

Your dad sounds a lot like mine. My dad bought a service station shortly after I got my first driver's license, and a couple of years later, opened an auto parts store. And the first thing I learned from my dad when I got a car was "you break it, you fix it." That definitely increased my interest in taking care of it. And he'd have been furious if he'd ever seen me rev an engine when it first started, or just before turning the key off.

Bird

 

[gordon]

Good thing was when I was growing up I had an older brother that did all the dumb moves and got in trouble for them. I would make a mental note don't do that. Even so I still did my share of dumb ones, but alot less because of him.
One night mom, dad and another couple went out for dinner. The last words out of dads mouth were don't use the car. Guess u guys can figure what happened next my brother and his friend took the car. They wrecked it into a telephone pole the front end was tore up pretty good.
I thought my dad was going to kill him and he might of if my mom wasn't there to interceed.
My brother spent the summer repairing the car. Dad would tell him in the morning what he had to work on and finish up that day. Took the better part of the summer to repair it and when it was finished dad painted it.
Needless to say I made a mental note never to take the car without permission.
Mark your dad was right it's alot easier to show smarts than hide dumb. /w3tcompact/icons/smile.gif

 

[Bird]

Gordon, Your theory about the older brother is probably right; the problem is that I was the oldest of five. And that telephone pole I planted my hood ornament in on my 18th birthday didn't do my Chevy any good, or my nose where it hit the steering wheel (before the days of seat and shoulder belts). I can identify with your brother; only took me a month or so to fix mine./w3tcompact/icons/frown.gif

Bird

 

[Kelvin]

I believe that the 1970s and 1980s Kubotas require more preheat than do the 1990s Kubotas.

My early model B7100 (1979?) requires at least 10 seconds of preheat when the engine is cold during warm weather; it requires 30-60 seconds during winter.

My B2150 (1990?) requires less than half of the B7100's preheat timing.