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. 

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. 

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. 

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. 

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.

Any advice or thoughts on my logic would be appreciated. 

Thanks,
Matt
> 
>> The bilge pump seemed to be running more than usual which led me to discover 
>> that one of the thumb screws on the speed seal for the raw water impeller 
>> was loose. I tightened it and while back behind the engine decided to check 
>> the oil, upon pulling the dipstick water came gushing out, under pressure 
>> and continued to do so for quite some time. It cycled the bilge pump about 4 
>> times. While it was coming out of the oil check pipe, I popped the radiator 
>> cap to check fresh water coolant level. It was fine and it did not seem to 
>> be draining.
>> 
>> I tasted the water and it seemed quite salty but I can't imagine that salt 
>> water got into the crankcase.
>> 
>> Obviously there is cooling water getting in somehow.
>> 
>> Any thoughts on where to start trouble shooting?
>> 
>> Motor specs:
>> 1984 Westerbeke W 27 (30 HP) ~2800 hours
>> (Probably unrelated history)  A few weeks ago the oil pressure relief 
>> jammed, dumping all the oil, so the relief valve has been replaced.
>> 
>> Also the exhaust had been spewing white steam (or smoke?) but a mechanic 
>> said that it was just steam from entering colder waters and running all day. 
>> Thought suspect of the diagnosis I had no reason not continue on as he 
>> suggested. But today it didn't smoke at all, so I thought he was right. Now 
>> I'm at anchor and unsure what to do next. Do I dare drain the oil, change it 
>> and try to motor into the nearest port? Or call the tow boat?
>> 
>> The nearest port is Pascagoula, MS. Can anyone recommend a diesel mechanic 
>> in the area.
>> 
>> Thanks gents,
>> Matt


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