Re: leak down test results
I would agree with Chris in that your leak-down test reveals an exhaust valve issue.
A good machine shop will make magnaflux testing protocol.
The term Fresh Water Cooled engine is often used in a misnomer fashion, and is often misinterpreted.
Fresh Water to some means an open system (raw water cooled) when running in river/lake water (apposed to salt water)... and Fresh Water to others can mean a Closed System.
The Dog Gone Heat Exchanger manufacturing companies even refer to these as "Fresh Water Cooling" systems! Sheesh!
To me, there is nothing Fresh about Ethylene Glycol and H2O.
Ya can't drink it, ya can't wash your hands in it, and ya can't brush your teeth in it! LOL
We should actually be referring to these as either an "Open" system (raw water cooled), or a "Closed" system (heat exchanger w/ ethylene glycol).
If this is a Closed Cooling system, then yes....... a head gasket failure would likely be pressurizing the cooling system, and would reveal itself.
However, the OP says that it's an open system...... I.E., Raw Water Cooled!
Last edited by RicardoMarine; 09-02-2012 at 10:00 AM.
Rick ... aka Ricardo
28' SDN F/B w/ twin Volvo Penta 5.7L DP's