How to replace Honda 20 hp impeller water pump. DO NOT LET YOURS LOOK LIKE MINE!!!!

Introduction

In this tutorial, we will guide you through the process of replacing the impeller water pump on Honda 9.9, 15, or 20 hp motors. A well-maintained impeller is crucial for optimal motor performance and to prevent overheating. Let’s ensure yours is in top condition!

Step 1: Gather Necessary Tools and Materials

Before beginning, collect all the tools and materials you will need for the job. This will help you work efficiently and avoid interruptions.

• Tools:

  • Screwdriver set
  • Wrench set
  • Pliers
  • A bucket or pan for draining water
  • Sealant

• Materials:

  • New impeller
  • Gasket or O-ring (if needed)
  • Lubricating grease

Step 2: Prepare the Motor

Start by preparing your motor for the impeller replacement.

1. Turn Off the Motor: Ensure the motor is completely off and cooled down.
2. Disconnect the Motor: Remove the motor from the boat if necessary for easier access.
3. Drain the Cooling System: Place a bucket or pan under the motor to catch any water that might leak out when you open the water pump.

Step 3: Remove the Water Pump Cover

Next, you will need to access the water pump.

1. Locate the Water Pump Cover: It’s typically found near the lower unit of the motor.
2. Unscrew the Cover: Use the appropriate screwdriver or wrench to remove the screws or bolts holding the cover in place.
3. Take Off the Cover: Carefully lift the cover off; you may need to gently tap it if it’s stuck.

Step 4: Remove the Old Impeller

With the cover off, you can now access the old impeller.

1. Inspect the Impeller: Check the condition of the impeller. If it looks worn or damaged, it’s time for a replacement.
2. Pull Out the Old Impeller: Gently pull the old impeller out of the housing. If it’s stuck, you can twist it slightly to loosen it.

Step 5: Install the New Impeller

Now it’s time to install the new impeller.

1. Apply Grease: Coat the new impeller with a small amount of lubricating grease to help it seat properly.
2. Insert the New Impeller: Align the new impeller with the drive shaft and push it into place. Ensure it sits firmly in the housing.
3. Check Alignment: Make sure the impeller is correctly aligned with the drive shaft for optimal performance.

Step 6: Reassemble the Water Pump

After the new impeller is in place, it’s time to put everything back together.

1. Replace the Cover: Align the water pump cover over the impeller.
2. Secure the Cover: Use the screws or bolts to fasten the cover back in place. Ensure it is tight but do not over-tighten.
3. Check for Gaskets or O-rings: If your model uses a gasket or O-ring, make sure it is in good condition or replace it.

Step 7: Test the Motor

Once everything is reassembled, it’s essential to test the motor.

1. Reconnect the Motor: If you disconnected it, place the motor back onto the boat.
2. Turn On the Motor: Start the motor and check for water flow from the cooling outlet.
3. Monitor Performance: Ensure the motor runs smoothly without overheating. If there are any issues, double-check your installation.

Conclusion

Replacing the impeller on your Honda motor is a straightforward process that can significantly extend the life of your engine. Regular maintenance, including impeller checks, is vital for optimal performance. If you find your impeller in poor condition, follow these steps to ensure your motor runs smoothly and efficiently. Happy boating!