Outboard motor thermostat

Experience told me that the thermostat might be stuck open.

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Outboard motor thermostat

One of the least appreciated components of an outboard motor is the lowly thermostat. It is subject to constant temperature changes, corrosion, and water pressure along with mud, sand, and salt, yet is expected to last forever. Often mis-guided individuals remove it from the motor thinking it is either not needed or to just get by when an overheat condition is caused by a different part of the engine. A thermostat regulates the temperature of the water for engine cooling and keeps pressure in the cooling system to facilitate heat transfer from the heads and the cylinder walls. That is made possible by having the proper engine temperatures and fuel mixtures. The brain of a thermostat is a component called a vernatherm that is fastened inside the thermostat housing. Shown on left side of the illustration, this device has a piston that moves upward to open the thermostat valve at a pre-determined temperature. The vernatherm consists of brass housing with an internal chamber containing a mixture formulated to expand at a pre-determined temperature. A piston fits into the chamber sealed with a rubber diaphragm. As the waxy mixture expands from water heating up, it pushes upward on the piston attached to the bottom of the thermostat valve. At the same time the hot water is exiting, colder water enters the engine causing a cool-down effect. As the vernatherm senses the temperature reduction, the wax contracts and the return-spring moves the piston inwards to close the valve.

Note: If the thermostat were stuck closed, the motor would likely be overheating. These symptoms could also be from a deeper problem, but the ease of checking the thermostat made this a logical place to start. One integral component ensuring this smooth operation is the outboard engine thermostat, outboard motor thermostat.

A smoothly operating boat is every boater's dream, ensuring not only a pleasurable ride but also the safety of everyone on board. One integral component ensuring this smooth operation is the outboard engine thermostat. However, its small size often leads to it being overlooked, despite its immense importance. In this blog, we'll dive deep into the outboard engine thermostat, emphasizing its service frequency to maintain optimal performance. The thermostat in your outboard engine is a temperature-sensitive valve. Its main role is to regulate the flow of coolant based on the engine's temperature.

When it comes to boating, one of the most important components of your vessel is the outboard engine. But have you ever wondered how an outboard engine thermostat works? A thermostat is a device that regulates the temperature of your engine by controlling the flow of coolant through it. This helps prevent your engine from overheating or running too cool. In an outboard engine, the thermostat is located in the cooling system. When you start the engine, the thermostat remains closed, preventing the coolant from circulating. As the engine heats up, the thermostat slowly opens, allowing the coolant to start flowing.

Outboard motor thermostat

One of the least appreciated components of an outboard motor is the lowly thermostat. It is subject to constant temperature changes, corrosion, and water pressure along with mud, sand, and salt, yet is expected to last forever. Often mis-guided individuals remove it from the motor thinking it is either not needed or to just get by when an overheat condition is caused by a different part of the engine. A thermostat regulates the temperature of the water for engine cooling and keeps pressure in the cooling system to facilitate heat transfer from the heads and the cylinder walls. That is made possible by having the proper engine temperatures and fuel mixtures. The brain of a thermostat is a component called a vernatherm that is fastened inside the thermostat housing. Shown on left side of the illustration, this device has a piston that moves upward to open the thermostat valve at a pre-determined temperature.

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Apart from providing you with good reads, we have a range of very useful sailing resources to round out your 'Latitude 38' experience. Old School. It should open in the water and close when removed. Anyway, after reading your article, I went to boats. If it didn't I'd be worried. At the same time the hot water is exiting, colder water enters the engine causing a cool-down effect. However, its small size often leads to it being overlooked, despite its immense importance. How would an engine with a bad thermostat act? I guess we'll have to wait for Blackexpress to come back and enlighten all of us. Please check your spam folder before sending us a message. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly. Leave a Comment Cancel Reply. Sorry I couldn't be more enlightening. Originally Posted by Bassmeister.

The thermostat ensures that the engine maintains a consistent temperature and prevents it from overheating.

Otherwise the use of an infrared temperature gun is needed to determine the proper cylinder head temp, especially on outboards. The vernatherm consists of brass housing with an internal chamber containing a mixture formulated to expand at a pre-determined temperature. Dash mounted gauges are not known for precision and only show the metal temperature surrounding the sending unit location. Did You Know? Jay 2 years ago. Old School. What is the Outboard Engine Thermostat? At the same time the hot water is exiting, colder water enters the engine causing a cool-down effect. It should open in the water and close when removed. As for how long a delay, all I know is what mine does. Whether you're looking for a regular service, a complete overhaul, or just a check-up, our superior service and extensive inventory ensure that your boating experience remains unparalleled. Custom Website by: Relivo Media.