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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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