exhaust debris for Yanmar 1900

joeshort · Dec 15, 2009

When I run the tractor for any length of time, I will end up having black specs all over myself and the tractor. What is this and what is causing this?

HoyeTractor · Dec 15, 2009

It is usually just diesel residue mixed with rain or condensation and is completely normal. There is not much you can do other than be sure you put a cap on the muffler if you store it outside to keep the rain out. Other than that you can possibly reposition your muffler so it points down instead.

Aaron
Hoye Tractor Parts
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normde2001 · Dec 16, 2009

I have been reading about "diesel slobber" ever since I have owned a Yanmar, (9 years), and no one, or any google search, has ever turned up a conclusive cause for it. The only cures have been that it mysteriously stops only after a complete overhaul, (possibly carbon removal). I don't have it but I would first try additives for carbon removal.

chriswheeler · Dec 20, 2009

Look up " Load Stacking " This happens in almost any diesel when it runs over a period of time with little or no load. Carbon forms in the head and exause manafold. Often if the carbon gets to bad, the engine won't take a load and the engine needs to be taken down, heads and exaust cleaned. This often happens with a diesel that is allowed to idle for long periods of time. Most commonly found in back up generators that have been run to exercise them, but no load electrical load applied for an extened period of time.
Chris

chriswheeler · Dec 20, 2009

Better search is " Wet Stacking "
Chris

SailorBob · Dec 21, 2009

My 1700 used to do that before I rebuilt the engine.

chriswheeler · Dec 21, 2009

Low compresson and/or bad rings or valves. Add to that running at less than 70%power for an extended period of time. Some times running at high load for an extended period of time will clear the engine out, but after a point, it's a tear down and clean out. Water in the exaust will clean out after a engine heats up if there isn't so much water in there that it enters the engine and breaks a rod or piston starting. Be sure and keep a coffee can over the exaust pipe when stored outside to keep the water out of the pipe to begin with.
Chris