Posted by Jim Allen on January 27, 2009 at 12:07:25 from (209.173.160.22):
In Reply to: 706D Exhaust Slobber posted by wicksfield on January 27, 2009 at 11:13:38:
My 826 with a German D358 does the same thing. They are very low compression, direct injected diesel engines with an efficient cooling system and they don't generate much heat at idle. When combustion temp gets too low, incomplete combustion occurs and slobbering begins. He's letting it run too cool and idle too long. While its doing the slobbering, it's also washing down the cylinder walls and diluting the oil. My policy now is:
1) In cold weather, never start (if you can, mine won't start very well starting at about 40F, even with ether, and at 30, fuggedaboutit) without the block heater run for at least an hour. I avoid startup until I know the tractor is going to be used very soon.
2) Minimize idling. It won't warm up much idling anyway and it won't stay warm enough not to slobber unless it's a very hot day. My tractor is either working or shut off.
3) If you must idle, keep it at about 1000 revs. Doesn't slobber much at that speed plus it generates a little more heat. Item 2 takes priority with me but after hard pulls, I let it idle a little to cool off before I shut down.
4) Make sure the thermostat is installed and working.
5) Install a block heater.
The results of this policy for me has been a drastic reduction in oil consumption (which is, in part, a byproduct of diluted fuel), much better oil analysis results (ZERO fuel dilution!) and less fuel used because it's either working or shut off. Anyway, through trial, error and good advice from the gang at YT, this is what has worked for me.
I should also add that my engine has 8300 hours. It's tired but still runs well. I now use no more than about 1-2 quarts per season, compared to 6 or 7 at purchase 4 years ago. I also changed from SAE 30 Case IH oil to 15W40 Rotella-T and the viscosity change accounts for some of the reduction.
This post was edited by Jim Allen at 12:14:37 01/27/09 2 times.
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