On Fri, Dec 03, 2010 at 09:22:36AM -0600, S/V Kaleo wrote:
> Thank you for the replys and advice. I realize I should have given
> more details in my email last night.
>
> I discovered the water after the engine had been shutdown for about 4
> hours (it had ran fine all day) and after I pumped the oil out this
> morning it was still quite black i.e. Not grey or milky leading me to
> believe that the water entered only after shutdown. The salty taste
> has me fairly convinced it's raw water (were cruising in salt water).
>
> After changing the oil, I'm able to turn the engine over with a
> wrench, meaning no hydraulic lock due water in a cylinder.
>
> I removed the exhaust hose from the back of the manifold and it was
> dry so there isn't water coming in from the muffler and leaking into
> the cylinders from a valve.
>
Excellent! You've narrowed the problem down to only a couple of
possibilities, then.
> The only place raw water touches the engine are the heat exchanger
> (which is brand new) and the raw water pump which is shaft driven and
> connected to the oil sump via a shaft and seals. I just discovered a
> service bulletin for my motor that talks about how the seals fail and
> let raw water.
Bingo. Pump goes right up to the top of the list.
> My logic leads me to believe it's the seals. I have a rebuild kit on
> board but would like to verify the seals are the problem before I tear
> it apart.
Note that when the rear seals fail, the weep hole (which your pump may
or may not have) will usually not indicate anything. I think you've got
about as clear an indication of rear seal failure as possible; I can't
think of any other way to diagnose it beyond running it and polluting
your oil again.
> I've drained and changed the oil, but nothing further. I guess the
> next step is to start it up for a bit and look for drips from around
> the raw water pump.
You probably won't see anything - but you'll get water in your oil
again. I'd recommend just pulling the pump.
Since you used oil instead of diesel, I'd suggest that you change it
again as soon as you get to a place where you can buy more oil - and
then, again within a few running hours. You really don't want salt
clogging up your oil galleries with corrosion, unless you want a
*really* expensive, catastrophic failure.
> We have a Towboat on the way but they've called to say they are stuck
> in the mud getting out of the channel we need to get into.
[grin] That would be part of the trouble with trying to rely on external
help, of course.
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