Originally Posted by llbarilla
You were all so kind to respond to my previous questions about whether or not to consider a Silverton 39' (gas engines) motor yacht. We took your advice and kept searching until we found a diesel powered 39' Silverton motor yacht. My other half just has a few more questions regarding diesel fuel consumtion. He's a retired mechanic, so forgive me for asking such technical questions as he asked me to read and post his questions word-for-word exactly as he wrote them for me.....so here goes!:
We are in the process of purchasing a 39'Silverton Motor Yacht. The boat is equipped with twin Yanmars 380HP Model 6LYASTD Diesel engines. If any of your folks can advise us on fuel consumtion we would much appreciate the info since we are planning long inter coastal cruising next summer. Please advise us re: Idle at 1500 RPM, 1800 RPM and full throttle operation gallons per hour. We would normally cruise @1800-2400 RPM. Also, what is the history for well maintained engines with regular oil and filter changes before needing overhaul? Thanks so much, you guys. We're so glad we found you! Linda
Yanmars are good engines and I believe they go about 5,000 hours. BUT, you should call your local Yanmar dealer and ask them how many hours they go. Also ask them for a fuel burn chart on that particular engine. If the engine is achieving full RPM's at WOT, the the chart should be pretty accurate. Once you have the fuel burn chart, take the boat out run it at the various rpm's and jot down your speed (from GPS) at each rpm. Then go home and calculate your gallons per mile. Fuel burn divided by boat speed.
One thing I would recommend with Yanmar's or any diesel is having at least 1 spare set of filters for both motors (fuel and oil), maybe 2 sets of fuel filters, and a spare set of impellors and belts if the engine is equipped with belts.