Say goodbye to overheating: how to easily replace the water pump on your yamaha 250 outboard

Maintaining your Yamaha 250 outboard is crucial for its optimal performance and longevity. One essential maintenance task is changing the water pump, which ensures adequate cooling for your engine. This comprehensive guide will provide you with a step-by-step tutorial on how to change the water pump on your Yamaha 250 outboard, empowering you to tackle this task with confidence.

Tools and Materials Required

Before you begin, gather the following tools and materials:

• Yamaha 250 outboard water pump kit
• 10mm socket wrench
• 12mm socket wrench
• Phillips head screwdriver
• Flathead screwdriver
• Grease
• Rags
• Bucket or drain pan

Safety Precautions

• Allow the engine to cool completely before starting any work.
• Wear appropriate safety gear, including gloves and eye protection.
• Disconnect the battery to prevent any electrical hazards.

Step 1: Remove the Lower Unit

• Place the outboard in the neutral position.
• Support the lower unit using a jack stand or another suitable support.
• Remove the shift rod by unscrewing the nut and pulling it out.
• Unscrew the propeller nut and remove the propeller.
• Unbolt the lower unit mounting bolts and carefully lower the unit.

Step 2: Remove the Water Pump Housing

• Locate the water pump housing, which is typically on the lower side of the lower unit.
• Remove the bolts holding the housing in place and gently pry it off using a flathead screwdriver.

Step 3: Inspect the Water Pump

• Inspect the old water pump for any signs of wear or damage.
• Check the impeller for cracks or missing blades.
• Examine the housing for any corrosion or leaks.

Step 4: Install the New Water Pump

• Apply a thin layer of grease to the new impeller.
• Insert the impeller into the housing and make sure it aligns correctly.
• Install the new housing gasket.
• Place the housing back onto the lower unit and tighten the bolts.

Step 5: Reinstall the Lower Unit

• Lift the lower unit back into place and align it with the mounting bolts.
• Thread the bolts and tighten them securely.
• Install the propeller and tighten the nut.
• Insert the shift rod and secure it with the nut.

Step 6: Flush the Cooling System

• Connect a garden hose to the water intake on the lower unit.
• Start the engine and allow it to run in neutral for a few minutes.
• This will flush out any trapped air or debris in the cooling system.

Step 7: Test the Water Pump

• Shift the outboard into gear and run it for a short period.
• Check for any leaks or unusual noises from the water pump area.
• If everything operates smoothly, your water pump is successfully replaced.

Wrap-Up: Ensuring Optimal Cooling for Your Yamaha 250 Outboard

By following these detailed instructions, you can confidently change the water pump on your Yamaha 250 outboard, ensuring optimal cooling and extending the life of your engine. Regular maintenance is crucial for the reliability and performance of your outboard, so don’t hesitate to tackle this task when needed.

Top Questions Asked

Q: How often should I change the water pump on my Yamaha 250 outboard?
A: It’s recommended to change the water pump every two to three years or as per the manufacturer’s guidelines.

Q: Can I use an aftermarket water pump kit?
A: While it’s possible to use an aftermarket kit, it’s always advisable to use genuine Yamaha parts to ensure compatibility and optimal performance.

Q: What are the signs of a failing water pump?
A: Look out for symptoms like overheating, reduced water flow, or unusual noises from the water pump area.