I'm the second owner of a 27HP Yanmar
30GM30F with about 670hrs. I was transiting the boat and the engine
started losing power. The engine
was cruising around 2800RPM and then wasn't able to go above 2000RPM without producing black smoke, plus the throttle was still at the previous 2800RPM setting. I scooped up some exhaust water
and there was what looked like little bits of black carbon floating in it. Trying to get the engine to power up to 2800RPMs also left a black patch in the water
, not oily though. Prior to the smoking, the engine ran for about 12 hours at 2800 RPM
, then had it off for about 15 hours and then ran it again for 8 hours before the power loss was noticed.
From the books
and talking with the local Yanmar
guy, he said the likely culprit is the mixing elbow
. Does this sound about right? Anything else I might consider first?
Also, I am extremely new to diesel
engine repair/maintenance but want to do everything myself. So the elbow
in the photos below is what should be replaced correct?
thanks for the help!