Good story, reasonable escape from an awkward situation, but I think that you were likely chasing the wrong problem. Your symptoms sound suspiciously like either a too-big prop, a proper prop with serious fouling on it, or a foul hull
. Any or all of the above can overload the engine enough that it will not reach the red line under load. The ability to get more RPMs in reverse could be due to the prop not working as well in reverse or your gearbox
having a different reduction ratio in reverse (many do).
One thing to add to your knowledge: in marine diesel
engines the "throttle" lever is attached to a governor, not to a thing like the throttle valve in a carburator. Thus, for any given "throttle" setting, the injector pump
increases the fuel
injected into the cylinders until the RPM
reaches the appropriate speed and then backs off enough to just maintain the speed. So, if your throttle linkage allows your engine to reach 3000 RPM under no load then it is adjusted correctly to allow it to reach the same RPM under load -- if there is enough power available. Too great a load and it can't make it.
You might have a look at your bottom and your prop and check for barnies and such. Yeah, I just heard that it was the coldest day in Sydney
for many years, so I hope that you have a good wet suit! Good luck with it!
Jim and Ann s/v Insatiable II lying Manly, Qld, Oz where it is slightly warmer...