Why is my Mercury outboard not pumping water?

There are three reasons your outboard motor’s impeller won’t pump. The first is that the water stream fitting — the outlet hole for an outboard motor’s cooling system — is clogged. The second is that the water inlets are clogged; no water is getting to the pump, so it isn’t pumping.

Why does my outboard motor not pump water?

The water pump impeller is the cause of most water circulation and overheating problems. The impeller is essentially a small, round disc with spinning blades used to move water through the circuit of the outboard motor. When the impeller is broken, it stops the supply of water to the engine and results in overheating.

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.

How do you test an outboard water pump?

How Do You Test an Outboard Water Pump? On many outboards, you can simply put on the muffs and start the engine. You should see a steady stream of water coming out of the holes on the top of the engine. However, some brands do pump out a stream, but it might not look steady.

How long do outboard water pumps last?

All impellers should be changed at a minimum of three years. Some will not make it that long depending on many things, how often it is used… too little and it will deform and tend to dry rot.

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.

How often should you replace water pump on outboard?

Some folks change them every 2nd year. Some folks change them every 5 years. Some folks don’t change them until they no longer pump water. Generally speaking a 5 year interval likely works well for most folks.

When should I replace my outboard water pump?

How often should you change water pump on Mercury outboard?

Mercury recommends changing the impeller every 300 hours…its in the owners manual. It’s an easy enough job to do yourself if you have some mechanical skills.

How often should you replace outboard water pump?

It’s good outboard maintenance practice to check your water pump impeller every season, and replace it every two to three seasons. 300 hours of use or every 3 years whichever comes first!

How long can you run an outboard with no water?

How Long Can an Outboard Run Without Water? An outboard motor’s water pump will be damaged in as little as a few seconds without a water source. Depending on the size of the outboard engine itself and ambient temperatures, it may be able to go a few minutes without damage.

Is water supposed to come out of outboard?

Yes, water should come out of the prop hub with the exhaust.