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, outboard motor thermostat.

Welcome to BBCBoards. If this is your first visit, be sure to check out the FAQ by clicking the link above. You have to register before you can post. To start viewing messages, select the forum that you want to visit from the selection below. If you're still having problems resetting your password, contact us. Please check your spam folder before sending us a message.

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.

Heavy Usage Fishermen, Tour Operators : In such cases, a more frequent check, possibly every six months, is recommended, outboard motor thermostat. Water conditions also play a role. How would an engine with a bad thermostat act?

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. Note: If the thermostat were stuck closed, the motor would likely be overheating.

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.

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.

Nexus mods download

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. If it turns out to be functioning, you can return the thermostat to the motor. 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. I guess we'll have to wait for Blackexpress to come back and enlighten all of us. We plan to open registration next Wednesday, March 17, St. Hailing Port. Thermostat location on my Yamaha T8. Now What?

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

Fuel Efficiency: A well-regulated engine temperature ensures optimal fuel combustion, leading to better fuel efficiency. If the thermostat isn't functioning correctly, it might not open at the required time, leading to overheating. That is made possible by having the proper engine temperatures and fuel mixtures. It's a relatively inexpensive component, and timely replacement can prevent more significant, costlier issues down the line. On the T8, I had to remove the plastic flywheel and dust covers to expose the thermostat housing. Engine wouldn't come up to operating temp. All rights reserved. At Power Implements, we understand the intricacies of marine engines. Anyway, after reading your article, I went to boats. Did You Know?