A cracked head won't let fule into the crankcase. It could allow water
in, or oil into the water
Injectors should be treated like spark plugs. They need servicing. Aprox every 1000hrs they need adjusting. I will assume they were rebuilt when the engine was. although it is quite possible if they were in reasonable condition, that they just got a clean and recalibration. They may now need reseating or even new nozzles.
When using an engine daily to charge batteries, there are two important things to do. Firstly, get the engine/gearbox engaged ASAP. Start the engine, let the oil pressure come up and engage the box. Reverse is fine and simply Allow the boat to pull on the mooring
. The other issue is to not allow the engine to idle dead slow. Lift the RPM
slightly to say 1000RPM if you can. This stops "injector shock" from rattling the drive train and destroying it. The shock will smack away at clutch
plates and gears and cause major wear. It also allows a little more load on the engine to help in it's case of stopping bore glazing.
If the bore is startign to glaze, all is not lost
. It is quite possible to reverse this if it has not gone too far. Simply work the engine hard from cold from now on. Instead of sitting on a mooring
all the time, you need to cast off and get the engien under good hard load ASAP before it has a chance to warm up. Allow it to come up to temp and then come back to the mooring. Some time of doing this can help seat in those rings again.
White smoke at start can be a sign of unburn't diesel
. Unfortunatly it is not easy to diagnose any thing definate from here. But it is most likely just a few burst before the cylinders fire, it could be one or more cylinders taking a little extra to fire, it could be diesel
lying in the pot from a leacky injector (source of problem) or it could be steam from water in the exhaust, or it could be none of the above.
Diesel oil will go black quickly. It's the detergent in the oil that is doing it's job in flusing away the carbon. If water is getting into the oil, then the oil will go grey'ish white and often a greasy grey'ish white waxy gunk accumulates in the tapet cover and breather area.