FAQ: How Do Outboard Motors Get Air?

How are outboard motors cooled?

Outboard motors are typically designed as open loop cooling systems. Meaning the motor draws water from the host body. That water is circulated through the engine, and fuel pump to maintain prop engine temperatures. After passing through the engine or fuel pump the water is then dumped back into the host body.

Where does the exhaust come out on an outboard?

Most all of the exhaust of an outboard is expelled through the bottom fin of the propeller. This is why there are bubbles coming up from the propellers when the boat is started. This exhaust is also mixed with some water from the cooling system.

Does an outboard motor need a blower?

Any inboard gasoline engine will require a blower system to help vent those volatile fumes, and a spark arrestor to reduce flames in the event of a back-fire. Oh and just because you have outboard engines doesn’t mean you don’t have fuel risks. Any fuel system can leak, release vapors and cause fires.

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Do all outboards have a pee hole?

Outboard Motor Isn’t Peeing. Most outboard motors are equipped with a cooling system using outside water. Outside water is circulated through cooling passages before leaving through the motor’s “pee hole”. You’ve seen it!

Do outboards have coolant?

To prevent freeze damage, prior to winter storage, many owners simply drain the cooling water out of their outboards. However, while it might seem like “overkill”, we recommend flushing your motor with antifreeze.

How much water should be coming out of outboard?

Re: how much water The thermostat will not open till the motor reaches around 140+degs. and water should come out the pee hole then as the stats open up. There should be an exhust/water port on the midsection back side that should have water spiting out of them at idle and till the stats open up.

Does water come out of exhaust on outboard motor?

The exhaust on an outboard Motor is located at the base of the propeller. The gasses produced by combustion are released. When the vessel is in operation, look behind the boat and locate the bubbles trailing behind the motor. The trailing bubble line is a result of raw cooling water and exhaust as the engine operates.

How do I know if my outboard 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.

What happens if you don’t use the blower on a boat?

Do not take this lightly – a non-functional bilge blower can cause your engine to catch on fire while you are out on the water. In extreme cases, it can even blow your boat to smithereens, taking the lives of all passengers on board. Thus, you should never start an inboard engine boat that does not have a bilge blower.

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Why should a boats gas tank never be completely filled?

It’s important to never fill the tank of your boat beyond 90% full. This leaves room for gas to expand and avoids the potential for overflow. Ensure that all air vents and valves to the gas tank are open.

When should you run the blower on a boat?

The minimum recommended time you should run the blower to ventilate the bilge is four minutes. Before switching it on, however, rely on one of the most sensitive odor-detectors you have — your nose. No bilge blower will rid the compartment of spilled fuel, which will continue to emit vapors.

Which is better 2 or 4 stroke outboard?

From a cost perspective, a 4-stroke outboard is far more fuel efficient than a 2-stroke. The fuel efficiency of a 4-stroke motor can be 50% better than that of a 2-stroke motor with the same HP. They’re quieter than 2-strokes, with the lower pitch of the motor being less of a nuisance.

Do new outboards come with controls?

An outboard isn’t much good without controls, but motors don’t come with them. Buyers choose their own and most folks will go digital unless they’re on a strict budget.

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