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I operate a vessel with twin 165 Mercs.
This season the port engine intermittently shows evidence of water contamination in the oil. That is, a greyish brown sludge appears on the dipstick and oil filler cap. The oil on the bottom of the dipstick is NOT milky.
The evidence completely...
I've installed a heat exchanger in the vessel's cockpit and feed it with hot water from the engine water pump. The return is connected to the exhaust manifold.
Unfortunately, no hot water seems to enter the hose at the engine.
I suspect that there is insufficient pressure. The total hose...
