Diesel Soot

boomer22 · Dec 23, 2013

I got to use my 706 for the first time to move snow, this is my first winter with it. Went out to start it and had a trickle charger on it for awhile now. I used the glow plugs for several minutes and hit the start button. It was very rough starting, I know diesels are hard starting in the winter, and I have read the 706 is very hard to start. It was belching smoke, (of course it was in a shed so it compounded the smoke). I continued to hold the glow plug button till it started to clear up...while it was clearing up it was putting out a lot of soot, the soot was all over the hood. I was just wondering if this was normal or if not what to do? Ran fine after it got warmed up and was almost a joy to move snow.

Thanks for any replies.
boomer22

David G · Dec 23, 2013

Glow plugs only get the engine to start, the cylinder heads and pistons must be warm for complete combustion.

On another note, are you sure all the plugs are working?

kevinj54 · Dec 23, 2013

You may want a block heater if it gets very cold there.

Allan in NE · Dec 23, 2013

Yep,

Get a heater on 'er.

Allan

boomer22 · Dec 23, 2013

Thanks for all the help
Yes it is 1 degree today was warmer yesterday. I do have a plugin heater on it (external inline heater) just didn't plug it in. I have tested it and it gets very warm so I assume I just need to plug it in a hour or so ahead of using it. Don't think it should be plugged in all the time. Not sure all glow plugs are working as the glow plug wire is very cracked along it. Was going to make my own but don't have the tools guess I'll have to buy them from Case.

kevinj54 · Dec 23, 2013

If it started at zero I am guessing most of the heaters are working. One or two hours on the block heater will make a big difference.

You still should check the heaters, does the meter peg out or only go up part way?? (I am assuming yours has a glow plug meter like my 560)

boomer22 · Dec 23, 2013

yep it pegs out for however long you hold the button

mazemeister · Dec 23, 2013

if it started under its own power at 1 degree F, it must be in pretty good shape no matter how much it smoked. they will all smoke for a couple sec-to a couple min until they warm up for complete combustion.

caseyc · Dec 23, 2013

The only thing you mention that doesn't sound normal
is that it started without being plugged in at 0*
degrees!!!! I have a 656 with the same engine. it
will start on it's own down to around 10* but it's a
hard go. I just plug it in if I know i'm gonna need
it below 30*. Even then it will spit, pop and
everything else for a few seconds, just the nature
of the beast.

Casey in SD

David G · Dec 23, 2013

If it started at 1 with no heater, glow plugs are fine. That is a good accomplishment for an older diesel with the lower pressure injection.

I would get a block heater on it and plug it in if less than 30 out, it is much easier on the engine.

Owen Aaland · Dec 23, 2013

One of the byproducts of the combustion process is water. Another is carbon. When the engine is warm this water will leave the muffler as water vapor. Some of the carbon will collect in the exhaust system. when the engine is working hard you may see some of the carbon glowing red as it is blown out of the muffler.

On a cold start the water condenses in the manifold and muffler. The water droplets are heavy enough to knock some of the carbon loose and it is carried out of the muffler with the water. Since you have liquid exiting the muffler rather than vapor it falls down on the hood leaving the spots of carbon rather than being carried away from the tractor.

Diesel Soot

boomer22

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David G

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kevinj54

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Allan in NE

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boomer22

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kevinj54

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boomer22

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mazemeister

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caseyc

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David G

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Owen Aaland

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