I agree with Tom:
"The black smoke may indicate excessive carbon buildup. If you don't have three hours to run it is, next time you bring her in while the engine is still running out it in neutral and run it up to 90% of max RPM for about 5 minutes. Tom Buscaglia S/V Alera" The combination of doing this, using Diesel Kleen Cetane+ Fuel additive, and motoring with engine at 100% throttle for about 20-25 minutes several times a month has turned my engine from a "Hard Starter" to one that fires-up within about 2-3 seconds every time. The skeptics can refer to both section 2-4-1 of the Yanmar service manual and section 7-4 of the Yanmar Operation Manual as say the same thing: Stoping procedure 1-a) Place the clutch handle in "Neutral" position and let the engine idle for about 5 minutes. Important note: If the engine is stopped suddenly while at high temperature, the temperature of various parts will increase. This may result in engine trouble 1-b) After five minutes idling place the speed control lever in the "Full" position to raise RPMS to about 36000 to blow out any burnt gas in the cylinder 1-c) set he engine to the lowest speed (850-900 rpm), cut the fuel, and stop the engine. -Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA
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