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Losing coolant in 6-71 TIB

z28jimi

New member
The heat exchanger has been pressure tested twice, no leaks. Yet when I run the boat, my starboard engine is eating coolant. None in the bilge, none in the oil, but I can smell it in the exhaust. Rate of loss seems to slow as the day progresses, but it can lose one to two gallons in a day of running. We keep it topped off by adding every hour or so, but know this isn't the way to operate. Anyone have any suggestions on where to look?
 
try removeing exhaust manifold and pressure test at this time do the same to engine,check exhaust ports for rust.
 
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