You say "Well for once no one said check ignition timeing!" You say that because with the ignition off, timing cant have anything to do with dieseling right ? I always thought the same thing until about a year ago. With no spark, how can timing have anything at all to do with an engine's tendency to diesel ???
Well i found out last year that ignition timing can have everything to do with an engines tendency to diesel at shutdown.
I have a heavy tandem truck with a GMC 478 V6 engine. As long as I have owned this truck, it ran hot, was underpowered and dieseled terribly at warm shutdown. Last year I discovered the timing marks on this engine had slipped position(damper outer ring had slipped) and actually were running the timing very late, very retarded. I repaired the timing marks and correctly timed the engine. It now ran much cooler and had much more power. Another thing really shocked me, this old engine no longer dieseled at a warm shutdown ????? Why ??? The late ignition timing was making the exhaust valves run very hot, hot enough to light off the fuel and keep the engine rattling along on a few cylinders.
So I learned that late ignition timing can have a dramatic effect on an engines tendency to diesel at shutdown. Your never too old to learn new things ;-) Im 64. ;-)
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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