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Good luck... and stop back if you need any assistance. :thumb up2:

:thumb up2: The "letter Oh" does not exist in serial numbers (only the digit ZERO).

Yes, I suspect it would be a very good idea to suspend the suspect thermostat on a string.

Thanks!

Just be sure to [Edit- SUSPEND ] the thermostat on a piece of STRING (it should not touch the pan).

Have you verified it's actually coming up to temp on the Starboard Bank (143 degrees)?

Any results yet?

Warning horn can be a SOLID TONE (BEEEEEEEEEEEEEEEP): Overheat

Four beeps, Pause, Four Beeps: Low oil level

Fast Beeping: Oil pump rotational problem (and/or Water in Fuel on EFI models).

Best method (JMHO) is to change water pump ANNUALLY, verify warning horn (overheat) is functional, and monitor water pressure via gauge.

Ie: Rely on warning horn and water pressure gauge as your...

Good info on the poppet valve.

Doubt seriously there is a problem there in this case. Elevated pressures (especially at idle) are common after a complete pump replacement, and will tame down...

Try pulling the hose that Joe recommended- but do it after the engine has run for 3-4 minutes. Will be a BEAR to get running when COLD if that hose is off.

When was your Water Pump last replaced?...

Cold compression tests really don't tell you a lot... for best results, follow the recommendations in the link below:

Compression Testing

Joe's suggestion on the thermal air valve may indeed be the source. Keep in mind- the valve is designed to open at approximately 100 degrees F (and if the thermostat on the STB bank is sticking...

You will also need to bleed the air from the ENGINE mounted tank (and line between the two tanks). See the FAQ section for instructions.

That will make it worse.

How full are you filling your REMOTE oil tank?

Does the remote tank appear "swelled" after you run down the river for 5-10 minutes?