- Change the oil in the engine
- Change the oil and filter in the generator
- Replace the zinc on the engine heat exchanger.
- Take a look at the diodes in the alternator (I think one may be blown)
RRRrrrrrr, vroom. And then always check the exhaust for water. This part of the task has become perfunctory, since the water is always there. Well, not so much. I'm glad I checked - the exhaust was dry.
Already the day is not turning out like I had planned. Rats. OK, so add one more task to the list, and it goes on top:
- Find/fix the problem with raw water cooling.
No joy - exhaust is still dry.
That's where I am right now. I'm drinking a beer and eating lunch. Stay with me today as I work my way thru the raw water cooling system... because this too is part of living aboard.
Lunch is over, and the inspirational beer is consumed.
I know I have water as far as the pump. Next in line is the heat exchanger, and lookie there, item #3 on the original list is to change the zinc on the heat exchanger. Doing so will remove an item from the list, and also allow me to determine whether water is getting this far.
Yup, the zinc needed replaced, and yup, water gets to the heat exchanger.
Downstream from the heat exchanger, the water next enters the water-cooled exhaust manifold, thru this connection:
Is there any chance that the inlet is limed over? I'd say there is, but whether or not it is, it sure looks like a gasket needs to be replaced here, so that will be the next stop in our journey. There is more than an even chance that those bolts holding on the endplate will twist off instead of unscrewing. If that happens, then I must remove the entire exhaust manifold and take it to the shop where I can drill out the bolt ends and probably rethread the holes.
(Starting from the other end, I should also add that I can hear the engine exhaust coming out of the vented loop vent that is the next item downstream from the heat exchanger. This means, I believe, that the exhaust elbow is not blocked.)
But before I tackle removal of that endplate, I should remove the alternator that is visible in the picture below it. Draining salt water thru the alternator won't do it any good, and the alternator is item #4 on the list anyway.
So, that's what I'll do with the rest of the day - pull the alternator and check the diodes as well as the internal connections, since I still have evidence that the sense lead is not delivering current to the alternator internals somehow.
And I'll spray WD-40 on those bolts.
So, the original plan for the day got seriously changed. Paraphrasing (and generalizing) von Moltke, "No plan survives contact with reality."