Jeez that is one thing bugging me like crazy!
So far what I have done:
-All three injectors serviced and Injection pressure readjusted (as good as new)
-Intake manifold clear of any obstruction till valve
-Exhaust manifold clear of any obstruction all the way to through hull
-Propeller and Saildrive
as clean as they get without anything tangled or causing drag
-Took the Anode of the sail drive and even though propeller
is grinding a little, no problem
-Opened the Cone clutch
assembly, checked bearings and gears (all 100%ok)
-Checked sail drive rotation (by hand) and compared it to other side (all 99% similar)
level and viscosity (found diesel in oil, not existing at begin of thread)
disconnected lifting pump and ran diesel line direct to filter, no more diesel in oil (speaks for
a damaged membrane in lifting pump) but original problem still unchanged (low revs and
black smoke under load weather
in marina or at sea) Oil brand new now and no more
-Changed all diesel filters on faulty engine (even though quite new before) same problem
-Checked the Injection pump for bumps or other visible spots where timing could have been
accidentally changed (nothing) plus it revs in neutral exactly like the other engine, without
black smoke. I don't think timing is off
-bled the whole diesel system numerous times (and not for the first time) with no change to
the initial problem
While doing all that I found out a funky issue with my Injection pump. I described it earlier but found it might have been misunderstood. With the engine off, I loosened all three injector lines at the top of the injector (my aim was to take the injectors out) after I took all three injector lines of the injector I noticed #2 was free flowing Diesel and nothing out of #1 and #3 (engine is not running!).
My first thought was that the injection pump was positioned in a way to cause the free flow out of #2. So i turned the engine by hand to see if that will change and each diesel line will, one at a time, free flow some diesel. In my head I thought this could be from the automatic bleeding system. But no, I can see #1 and #3 "injecting' at their 14 degree after TDC and #2 as well but all the time number 2 is spilling diesel like an open tap.
I called Yanmar without real help, called bosch service and other Injection pump specialists all with the same answer "Impossible for the diesel to free flow out of injection lines"...now i am stunned. All I know it is free flowing and not stopping.
Does anyone had or heard of that issue before? I can make a video if necessary.