MDJE Apparent loss of power

[yachtgilana]

Hi gents, its been a while. over winter I replaced the exhaust system on the gengen. I found the build up of crud in the injection elbow quite bad. Cleaned it out to full bore again. Replaced hoses and went up a size, also replaced the wet muffler collector, to a higher position to reduce the pressure head of lifting the water out of the boat. Some other minor cosmetic work and was looking forward to a happier genset. BUT! she seems to be suffering from lack of power. I adjusted the governor to one click before hunting, and set the revs with the reed freq counter. The symptoms are a drop in speed (warmed up of course) when applying load, and if I adjust speed under load, then she nearly runs away after removing the load. The governor arm is responding powerfully to changes, there is no black smoke, (nor any smoke) it just seems that she is a bit gutless. I am wondering if the fuel is past sell by date. Has anyone had experience with fuel quality affecting output? Where would you start the troubleshooting? The compression "feels" good on barring over, and listening at the oil fill while barring I cant hear blow by. ???

[Richard L]

Sounds like you may be running on one cyl.
Try cracking the injector feed line with the set running and see if you get a drop in power. If you do it would indicate you have a cyl that is not firing, also feel the exhaust outlets and see if they are both warm. Also how are your fuel filters?
R