Quick Answer: Raw Water Pump Impeller Replacement How To Guide?

Can you put a water pump impeller backwards?

When an impeller is running backward, the centrifugal forces will still accelerate the water—although far less efficiently. If the impeller is threaded to the shaft, it may unscrew when running backwards. This however will break the impeller if you turn the pump while it is spinning backwards.

How do you install an impeller?

Screw the puller against the shaft, lifting the impeller out of the housing or until loose. Twist and pull the impeller out of the pump. Apply a non-petroleum based lubricant to impeller (i.e. silicone or soapy water). Install the impeller with a twisting motion onto the shaft.

How often should a boat impeller be replaced?

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 do I know if I need to replace my impeller?

A boat impeller needs to be replaced if its vanes are slightly melted or have cracks in the roots, or worn off. Yet, many experts suggest yearly replacement as a general rule regardless of its condition, but you can do it whenever you see any visible loss OR do it yearly for peace of mind.

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What happens if impeller is backwards?

If the impeller runs backwards, the liquid is still discharged from the pump. This is due to centrifugal forces that move the fluid in the normal direction. The risk of reverse rotation is higher when putting in a new pump system, or replacing parts.

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

Symptoms of a Bad or Failing Water Pump

  1. Coolant Leak at the Front-Center of your Car.
  2. Rust, Deposit Buildup, and Corrosion of the Water Pump.
  3. Water Pump Pulley is Loose and Making Whining Sounds.
  4. Engine is Overheating.
  5. Steam Coming from your Radiator.

How much does it cost to replace a impeller?

The impeller should run around $30/40 and take about 25 minutes or so. The hardest thing is getting the speedo tube back in place. Just apply greese on the bolts and impeller shaft and jog the propshaft and it should go smoothly. The last one I had put in my 50 hp Merc 4 stroke was about $125 installed.

How do you install a raw water impeller?

How to Replace a Raw-Water Impeller

  1. Find your raw-water impeller. Locate the raw-water intake seacock for your engine.
  2. Remove the center-plug. Before you pull out the impeller, note the direction the vanes point.
  3. Use two flat-head screwdrivers to pry out the impeller with care. Insert the impeller and center-plug.

How do you test a raw water pump?

Hook up the fake-a-lake, disconnect the water line to the raw water pump. Make sure water goes through there. Hook the line back up, disconnect from the trans cooler, make sure water comes out there. You should have seen a bit more pressure coming from the output of the raw water pump.

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What does an impeller do on a pump?

WHAT DO IMPELLERS DO? Impellers pump cold water into your boat’s engine to cool it down while in use. If you have a bad impeller it can cause big problems.

What causes boat impeller failure?

Impeller pumps generally fail in one of two ways. This is usually caused by running the impeller pump dry. Remember, the fluid being pumped provides the cooling and lubrication for the pump. This is often caused by a water inlet seacock not being opened or a plastic bag covering the water inlet.

Do you have to drain lower unit oil to change impeller?

Yes, you will need to drain the lower unit fluid.

How often should you change impeller on Mercury outboard?

TomP. 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.

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