Hello Yanmar diesel gurus.
Our Yanmar 4Jh3-HTE has never missed a beat, until today.
Engine started fine and operated for 30-40 mins to lift anchor exit anchorage and get underway. Mostly at 1200-1500rpm. Normal shutdown, with a short rev to approx 2500rmp before return to idle for a minute or two then shutdown. Temp and oil pressure all normal.
After approx 1 hr sail to next anchorage engine started fine and operated at approx 1500 rpm for 15 minutes into anchorage then idling while anchoring for approx 5 mins, 1200-1300rpm to back down anchor, then after a short idle another rev to approx 2800 rpm then return to idle. When the engine rpms returned to idle the engine just stopped. After thinking through everything that just happened I attempted to restart the engine and it did not catch after approx 3-5 seconds of cranking.
We had lunch and allowed the engine to cool for a little over an hour. I checked coolent level, oil level, fuel in racor, looked over the engine and then attempted to start with no luck. Next I pumped the fuel priming pump on top of the filter a few times but I did not bleed any fuel out. I attempted to start two more times with approximately 5 seconds of cranking each time with no success. No indication of any firing.
Finally: I drained about 1/4 cup of clean fuel from the bottom of the fuel filter, then loosened the fuel bleed valve and pumped some more fuel out of the bleed valve. It did not appear that there was any noticable air in the system. Cleaned up and retried with Lori cranking for 5 seconds while I pumped the priming pump. No success.
Fuel tank has over 500 liters.
I thought I'd check in with other Amel owners to get inputs on the next steps for troubleshooting.
Thanks and regards, Daniel Carlson on sv BeBe, SM #387