Best answer: How hot should a outboard motor run?

The engine was designed to warm up at idle and cool down at higher throttle settings. A warm 2-cycle engine will idle better than a cold one any day of the week. The thermostat will usually run the engine somewhere around 135f at idle if operating properly.

What temperature should my outboard run at?

Typical temperature at IDLE speed should be 160°F ± 20°F (71°C ± 11°C). should be 120°F ± 20°F (50°C ± 11°C).

How hot is too hot for an outboard motor?

Way lower! The larger Merc’s have 143°F thermostats. Over 170°F is overheating. If it’s too hot to hold your fingers on the head for almost all water cooled outboards, it’s too hot.

What is the average engine temperature for a boat?

Raw water cooled engines should operate between 140 and 160 degrees. Fresh water engines should run at 170-210 degrees. Mine is raw water cooled and runs around 160. The hotter it runs the better, up to a point.

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Is the water coming out my outboard supposed to be hot?

It’s kinda normal. My experience with Mercurys, Evinrudes is about the same the water is heated as it’s the exchange medium for the engine heat, coolant in your radiator gets a lot hotter. If it’s steaming from your outboard you got an overheating issue, just hot to almost scalding hot , no issue.

How do I know if my outboard thermostat is bad?

Symptoms of a failed thermostat (open position)

  1. Engine slow to warm up.
  2. Engine not reaching its correct operating temperature.
  3. Poor cold weather performance.
  4. Water flowing from the exhaust pipe at idle.

Can you run an outboard without a thermostat?

Can I Run My Outboard Without The Thermostat? 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.

How hot should a Mercury outboard run?

NORMAL idle temps should fall in the 120-140 degree range. Most commonly right around 125-132. ON PLANE temps will vary IMMENSELY. Warm water- may operate around the above temps.

Where should water come out on an outboard motor?

The cooling system on an outboard is a very simple and compact application. Water is inducted through the lower unit by a water pump impeller, and then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system.

At what temp does a boat thermostat open?

There are two common tstats – 140 degree and 160 degree. If you’re running normal you should see temps about 10 degrees above the tstat.

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Why would a boat overheat?

Overheating can also be caused by a worn or damaged water pump impeller. … If the impeller is damaged and is missing a vane, make sure any displaced pieces are accounted for and removed. Any debris left in the water passages may reduce flow, which leads to persistent overheating.

Is 210 degrees too hot for an engine?

Normal Temperature engine temperature gauge

Most experts agree that your engine should run between 195 degrees and 220 degrees.

How much water should be coming out of outboard?

Re: How much coolant water should be comming out of my outboard? Usually the cooling water pisses out of a small hole under the power head. There should be a hols approx 3 mm diameter facing down and a bit out. Normally a continuous flow expected, unless mercs are totally different.

What happens if an outboard motor overheats?

The cooling system keeps the oil temperature down so the oil can lubricate the internal parts of the engine. Overheating ruins the lubrication and the metals parts start melting and sticking together.

How do I know if my boat water pump is bad?

How to Tell if a Water Pump is Bad

  1. The outboard motor is overheating.
  2. The impeller is living on borrowed time.
  3. There is a reduced stream of water from the cooling water outlet.