Outboard motor thermostat

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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 the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly.

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. As the water in the engine again heats up, the cycle is repeated. Dash mounted gauges are not known for precision and only show the metal temperature surrounding the sending unit location. Computer-controlled engines with digital displays may indicate a more accurate cooling system reading.

You have to register before outboard motor thermostat can post. The brain of a thermostat is a component called a vernatherm that is fastened inside the thermostat housing. Computer-controlled engines with digital displays may indicate a more accurate cooling system reading.

Experience told me that the thermostat might be stuck open. The main telltales were the engine not getting warm I could feel it , and uncombusted fuel coming out of the exhaust I could see it and accumulating in the crankcase oil I could smell it. Moisture was also emulsifying the latter. The motor will often run under these conditions, but not optimally, and it is susceptible to more corrosion and wear. These symptoms could also be from a deeper problem, but the ease of checking the thermostat made this a logical place to start.

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. Once the engine reaches its optimal operating temperature, the thermostat stays open, allowing the coolant to circulate freely. If the engine starts to overheat, the thermostat will close again, stopping the flow of coolant and preventing further damage to the engine. One thing to note is that different outboard engines may have slightly different thermostats.

Outboard motor thermostat

The thermostat ensures that the engine maintains a consistent temperature and prevents it from overheating. If the boat thermostat is not functioning properly, it can cause a range of problems with the engine and cooling system. Inboard engines, on the other hand, operate on a closed-loop cooling system and pull coolant from a reservoir in the engine compartment. The thermostat is typically located between the engine and the water pump and is designed to open and close based on the temperature of the coolant used in an inboard engine or the incoming water in the case of an outboard motor. When the engine is cold, the thermostat remains closed, preventing the water or coolant from flowing through the engine, thus allowing the engine to warm up more quickly. Once the engine reaches its operating temperature, the thermostat opens, allowing the water to flow through the engine enable it to maintain a consistent temperature.

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Saltwater boating can lead to faster corrosion and buildup, so boats frequently used in such conditions may require more regular checks. Originally Posted by Bassmeister. Thermostat location on my Yamaha T8. We plan to open registration next Wednesday, March 17, St. I guess we'll have to wait for Blackexpress to come back and enlighten all of us. Custom Website by: Relivo Media. With our vast experience, dedication to service, and love for all things marine, we promise to be your trusted partner in every nautical adventure. 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. You have to register before you can post. Replacement: If the thermostat shows signs of wear or damage, it's best to replace it. Otherwise the use of an infrared temperature gun is needed to determine the proper cylinder head temp, especially on outboards. 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. Engine failure on the water is no joke, so it is vital to keep it running well.

One of the least appreciated components of an outboard motor is the lowly thermostat.

First Last. Boat Type. Patrick's Day. I would like to ask, when you replace your thermostats must you have the software to update the software for the engine or can you do this without messing with software? My prop is a 3 blade, As the vernatherm senses the temperature reduction, the wax contracts and the return-spring moves the piston inwards to close the valve. In this blog, we'll dive deep into the outboard engine thermostat, emphasizing its service frequency to maintain optimal performance. Then it was a matter of removing two screws, lifting the housing off, and pulling out the thermostat. One integral component ensuring this smooth operation is the outboard engine thermostat. As the water in the engine again heats up, the cycle is repeated. Originally Posted by Bassmeister.