Blue Smoke on Startup

N1ST · Oct 5, 2008

Folks,

I have 15 hours on by B7800. I've noticed that when I start it after sitting for a few days to a week, I get a puff of blueish smoke and a knock or two. Today I started it after not running it for more than a week and I got blue smoke for about 5 seconds with loud running for the 5 seconds. I do use some of the white bottle Power Service and I let it idle for 5 minutes or so before I turn it off.

Is this blueish smoke anything to be concerned about? Thanks.

kennyd · Oct 5, 2008

Is this blueish smoke anything to be concerned about? Thanks.

Not at all, it happens to all diesel's especially when the temps drop a bit.

Double Orange · Oct 5, 2008

Relax, everything sounds fine.
The Kubota engine you have is next to bullet proof.
The engine might even puff a small amount of smoke if you quickly power up or put it under a sudden heavy load.ie engage pto equipment or lift a heavy load.
I don't think you need to let it idle for 5 min before shutting down. If you where only doing light/medium work 1 min If under heavy load ie rototiller work or pulling a plow 2-3 min. will work.
Enjoy/work it....thats what it was made for!
Nice tractor and good luck
Frank

bandit67 · Oct 5, 2008

Is the smoke more light grey to white? That is normal if you don't cycle the glowplugs long enough. 5-10 seconds on the glowplugs should yield a good start with charcoal grey smoke, then let it idle for another 20-30 seconds before throttling up. Of course, winter temps require longer glow plug warm-up.

I've found with mine, if I throttle up only slightly when still cold, it coughs and chugs and spits out light grey smoke, but if I throttle it up a bit higher, the added heat clears it up pretty quick and gets it running smooth - that's if I don't give it enough idle warm up.

But it's always good to give a diesel a minute or two to warm up before getting to work.

leonz · Oct 5, 2008

N1ST said:
Folks,

I have 15 hours on by B7800. I've noticed that when I start it after sitting for a few days to a week, I get a puff of blueish smoke and a knock or two. Today I started it after not running it for more than a week and I got blue smoke for about 5 seconds with loud running for the 5 seconds. I do use some of the white bottle Power Service and I let it idle for 5 minutes or so before I turn it off.

Is this blueish smoke anything to be concerned about? Thanks.

Iisn't the B7800 equipped with a preheater too? Anyway seriously consider a salamander or use one if you own one-the kerosene kind to preheat the tractor as it will help tremedously no matter the weather. Great for scaring rodents too.

He keep me in mind as I would like to know what you think about the B7800 as I am looking to upgrade and replace my wheelhorse of 15 years-cant buy parts anymore or a new seat etc.

N1ST · Oct 5, 2008

Thanks guys. You put me at ease. I've worked the tractor good from 4 hours. I have pto work to do, so I can't baby it. But I haven't abused it and I haven't run more than PTO speed which is that the manual says.

Yes the smoke is on the grey to white side. I glowed it for 3 secs and the temp was about 60f, so maybe that was part of it. And yes, I do notice a little puff of smoke when I thottle up quickly from idle to 1600.

Thanks again.