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blowing black smoke when you gun a diesel is GOOD!!!! blowing white smoke is bad unless its very cold and just started.. after the engine gains speeds a levels out. there should be no smoke.. if the tractor is pulling a very heavy load,, there will be a little smoke.. it the tractor is blowing lots of black smoke underload,, its over loaded.. pick a lower gear.. or less load.. blowing black smoke with you "gun it" simply means the injector pump is in good shape and is "pouring the fuel" into the engine.. but the engine has not yet sped up to use that fuel.. this is normal and healthy.. in as much as the fuel system is good... and the injectors are clean.. blowing white smoke is either buring oil or imcomplete combustion due to being cold or due to low comression... so white smoke on a warm engine is a sign of oil burning or bad compression.. of course this applies to diesel engines...but ironically mostly true for gas engines but black smoke in gas mean flooding.. and is not good..
but white smoke means burning oil in gas engines... all older engines will do a "white puff" when they first start.. for even 5 to 15 seconds.. this can be due to valve guide wear.. which in common but not necessary a problem... good luck.. bill
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