How do I know if my boat thermostat is open?
There is a simple test to determine if a thermostat is opening and closing properly. Place it into boiling water. It should open in the water and close when removed. If it fails, replace it and the gasket with new ones.
How do I know if my mercury thermostat is working?
There should be an open circuit when the mercury is not contacting the wire contacts and a closed connection when it is. If the thermostat fails either of these simple checks, it is defective. The easiest way to check thermostat function is to jump across the terminal screws with a jumper wire.
Does a Mercruiser have a thermostat?
The thermostat monitors and maintains the operating temperature of a Mercruiser engine. It performs this function by opening and closing to regulate the intake water flow while the engine is running. Most marine thermostats operate between 160 and 180 degrees Fahrenheit.
How hot should a MerCruiser run?
Re: mercruiser operating temperature Raw water cooled engines should operate between 140 and 160 degrees. Fresh water engines should run at 170-210 degrees.
How much HP does a 4.3 MerCruiser have?
The MerCruiser 4.3L MPI engine is a multi-point, fuel injected engine. This V6, 262 cubic inch (4.3-liter) motor delivers 220 horsepower (HP) to the sterndrive at 4,400 to 4,800 RPM at WOT (wide open throttle). With a compression ratio of 9.4:1, it runs on 87 octane gasoline.
How do I test my boat thermostat?
Step 2: Put the thermostat in a bowl and immerse it in boiling water. As the thermostat heats up, it should open. When you remove it from the boiling water, allow it to cool and it should close again. If the thermostat remains open or closed, it has failed and must be replaced.
How do you know thermostat is bad?
You should be able to turn on your heating or cooling system from the thermostat, or change operation back and forth from heating to cooling. If you make changes at the thermostat and get no response whatsoever from your furnace, air conditioner, or heat pump, it could mean the thermostat is bad.
What temperature should a Mercruiser 5.7 run at?
You likely have a 143 degree t-stat in the engine, that is the usual temp. for raw water cooled engines.
How do I know if my mercury thermostat is bad?