1987 Sea Ray Sundancer 250.

Engine started a little rough, then stalled. Could not get the starter to
turn it over, even with both batteries fully charged and online. Brought it
to the dock mechanic who talked about a recent oil pan change, then
mentioned a replaced exhaust system last year.

He almost instinctively went for the spark plugs. After all were removed he
said the rear two on both sides (four all together) had salt water in the
cylinder. I know the boat is outside water cooled.

He said it could be one of the following, a failed exhaust where there is a
backdraft, a blown head gasket or a cracked head. The engine oil, which was
recently changed, was honey yellow with no sign of water. Beside the water,
the plugs were clean.

We are waiting for the master mechanic to look at it on Monday. In the
meanwhile we sprayed a ton of engine "pickling" into all cylinders as well
as the carburator to thwart any salt water action.

Anyone have any experiences/insights into this particular scenario? All
comments appreciated.

Thank you,
Mike