Water Pump Wear Plate – Fits Yamaha F40 F70 4-Stroke (Replaces 6CJ-44323-00)

Product Details

This Water Pump Wear Plate is designed for Yamaha 4-stroke outboard engines including the F40 and F70 series. It provides a critical wear surface within the water pump assembly, protecting the pump housing and ensuring efficient coolant flow throughout the powerhead.

This aftermarket component directly replaces Yamaha OEM part number 6CJ-44323-00-00.

• Essential water pump component subject to normal wear
• Fits multiple Yamaha F40 and F70 4-stroke configurations
• Precision-machined to OEM specifications for reliable sealing and durability

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Component Type

Water Pump Wear Plate

OEM Part Number

6CJ-44323-00

Application

Yamaha 4-Stroke Outboards

Primary Fitment

F40, F70 Series

What's in the Box

• 1 × Water Pump Wear Plate

Installation Notes

1. Disconnect battery and relieve any cooling system pressure before beginning work.
2. Remove the lower unit according to your engine service manual.
3. Disassemble the water pump housing and remove the old impeller and wear plate.
4. Clean all mating surfaces thoroughly, removing old gasket material and debris.
5. Position the new wear plate in the pump housing with the smooth side facing the impeller.
6. Install a new impeller, applying marine grease to the blades for lubrication during initial startup.
7. Reassemble the water pump housing with new gaskets and seals as required.
8. Reinstall the lower unit, torque all fasteners to specification, and refill the lower unit gear oil.
9. Test the cooling system by running the engine with water supply and checking for steady telltale stream.

Troubleshooting & FAQ

How do I know when to replace the wear plate?

Replace the wear plate whenever you service the water pump or if you notice reduced cooling performance, overheating, or weak telltale stream. Inspect for grooves, scoring, or uneven wear during routine impeller replacement.

Can I reuse the old wear plate?

Reusing a worn plate is not recommended. Even minor scoring can reduce sealing efficiency and impeller lifespan, risking engine overheating.

Should I replace the impeller at the same time?

Yes. The wear plate and impeller work together; replacing both ensures optimal water pump performance and prevents premature failure of the new impeller.

Which side of the wear plate faces the impeller?

Install the wear plate with the smooth, flat side facing the impeller to reduce friction and extend component life.

What causes wear plate damage?

Common causes include abrasive debris in the cooling system, dry-running the water pump, corrosion, and normal friction over time.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
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