What does a thermostat do on an outboard motor?

The thermostat prevents the cooling water from getting to the cylinder walls until there is enough heat for efficient combustion. Once the cylinder temperature is up, the thermostat allows the cooling water to flow from the water pump through the water jacket and out the exhaust.

Yes, you can temporarily run your outboard without the thermostat and not harm the engine. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine.

Additionally, what is the purpose of a poppet valve on an outboard motor? ) valve is sort of a water-pressure regulator for the cooling system on an outboard engine. At slow rpm’s the pressure from the water pump is pretty low, so the poppit stays closed, and allows all the cooling water from the impeller to circulate thru the engine cooling system.

Regarding this, what happens when you run a boat without a thermostat?

You can run no thermostat but Will cause your motor to make oil ,if in the winter it Will cause the engine too sweat . Will affect how your auto choke works and your warm up will be longer . Will be harder to tune both engines to run the same.

How do you know if your outboard is overheating?

If it has a telltale, and there’s water coming out, it ain’t getting hot. If you stick your finger under the telltale water it should be warm, but not hot. If the motor has a thermostat, it will probably run a little hotter.

Do all outboard motors have thermostats?

Most outboard thermostats are factory designed to open at approx. 160 degrees. The two things that need regular maintenance or may cause problems are the impeller and thermostat. The thermostat of an inboard plays a very crucial role in warming the engine to a satisfactory operating temperature.

What causes a outboard motor to overheat?

The most common cause of outboard motor overheating is water pump failure. Water pump failure can also be caused by a defective heat exchanger, though this is harder to check. Generally, if it is not a problem with lack of raw water flow or fresh water, the heat exchanger will be the cause.

Can you run a motor without a thermostat?

The car will run fine without it. There is another thermostat on the radiator of the water cooling system. Some cars have a thermal operating valve that opens and closes with the engine temperature controlling the water flow independently of the thermostat. Most cars radiators will have a fan fired on the radiator.

How hot should the water be coming out of my outboard?

Normally you shouldn’t,atleast for not that long with a hose. You probably will get better cooling when running the outboard on your boat,not just because of the wind/air but better water flow than with a garden hose. 140-150F is pretty hot.

Why is my Yamaha outboard overheating?

A: A faulty water pump is a major cause of overheating-related outboard engine failures. Debris – plastic bags, weeds, mud, or a combination thereof – clogging the water intakes on the gearcase won’t let sufficient cooling water into the engine.

Do inboard boat motors have thermostats?

Radiator and Thermostats Some inboard-outboard marine engines contain a closed loop cooling system that consists of a radiator, which uses anti-freeze (coolant) for the purpose of cooling the engine passages and wet exhaust manifold.

How does a Vernatherm work?

The vernatherm (oil cooler by-pass valve) closes the port to the engine and forces all oil through the cooler when oil is hot (180-190F). Before that oil can flow through the cooler or back to the engine.

How does a Mercruiser cooling system work?

Fresh seawater is normally drawn by a belt driven pump from a thru hull fitting in hull of boat on inboards, or by water pump in stern drive through the lower unit water passages on an inboard/outboard, and then exits the boat through the exhaust. Figure 2 shows the typical “enclosed” cooling system.

How do boat engines stay cool?

The water flows through the engine and directly out the exhaust. This cooler water absorbs heat from the engine to help keep it cool. Most newer marine engines use an enclosed cooling system. This fresh water is circulated through the engine and through a heat exchanger.

What temp should an outboard run at?

Re: Operating temperature for outboards (60°-63°C).

Do you have to run a thermostat?

Driving without a thermostat The warmth of the engine is what makes heat inside your car when you turn on the heater. So, if you drive without a thermostat, your engine will never reach its optimal operating temperature and your heater may blow cold air. If you live in a warm climate, this should not be a problem.