Brand new motor, noticed during break in that my water pressure was 15 - 20 PSI at 4500 RPM and 35 PSI at WOT? This can't be right can it?
Brand new motor, noticed during break in that my water pressure was 15 - 20 PSI at 4500 RPM and 35 PSI at WOT? This can't be right can it?
No- it's not.
When properly setup (and proper flow in the engine is occurring), you should expect:
-1-4 psi @ idle speed
-12 psi MINIMUM @ WOT (prefer to see 15+ for safe measure)
I'd be looking for a potentially STICKING POPPET VALVE (or a MAJOR setup problem).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Ok, the water pressure and Speed were hooked up backwards at the switching units. Also, the speed switching unit is bad and the dealer is sending a new one.
Water pressure now at 4000 RPM is about 7-8 and at WOT is 14-16.
That's much more like it.
Gray tubing goes to WATER PRESSURE (Block Pressure Sensor)
BLACK tubing goes to Pitot Sensor (Speed).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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