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post #1 of 5 Old 08-11-2010 Thread Starter
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Yanmar in Pearson 303

We've been using our Yanmar mostly to get our '83 Pearson 303 in and out of our harbor. Has anyone used their engine for extended periods of time, such as 10 hrs straight for 3 days? (We participated in "Swim Across the Sound" as a guide boat) Our engine seems to be in fine shape, but we don't want to push it. Any advice in this area would be helpful.
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post #2 of 5 Old 08-11-2010
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If your motor is in good shape.....

Running a diesel for extended periods of time is actually GOOD for it. The worst thing that you can do for a diesel is run is for short periods at low RPM. By short times, I mean 15-30 min at idle to 2000 RPM.

Turn on the motor, allow it to warm up for a few minutes, and then go to cruise mode, which is about 80% of max motor RPM. Run it there all day if you want. 10 h is long continuous time, but not bad for the motor.

Make sure that you have adequate engine oil in the motor and a quart in reserve in case you burn oil. I also estimate that if you're running 10 h days, 3X, then you'll need fuel. Try not to let your fuel go much below 1/2 a tank before refueling. At 10 h at crusie speed, you'll probably be burning about 5/8 to 3/4 gal/h.

Make sure you have a spare set of fuel filters and impeller just in case.


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post #3 of 5 Old 11-06-2010
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I agree with DrB. These little Yanmar engines are workhorses. A fog-bound, no-wind trip from Ventura to Redondo Beach was a power only situation. It took us 14 hours, motoring all the way. Check all fluids before departure, monitor cooling water discharge, and keep you eye on the engine temps. If your set up is like mine, the oil pressure and over temperature a idiot lights on the panel, so these need to be tested for operation. Of course there have been the cases that an "iron-genny" comes in handy to make a destination and we run then engine for a couple of hours at a time at 2000-2500 RPM.
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post #4 of 5 Old 11-13-2010
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A year ago we motored back to Maine from Nova Scotia in a dead calm, 21 hours straight @ 2800 RPM. 1985 Yanmar 3GMF in a 1985 Pearson 34. Engine is well maintained and watched carefully.
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post #5 of 5 Old 11-14-2010
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I ran my Yanmar 3hm35f fro 10 days straight 12 hours a day when motoring on ICW from Panama City back to Houston after the oil spill with no problems. I did check the oil daily and added as necessary since we have a slight oil leak. Also be sure to top off the coolant if fresh water cooled.
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