Water Pump Impeller Gasket – Fits Yamaha 40HP 50HP 60HP (Replaces 63D-44316-00)

Product Details

This Water Pump Impeller Gasket is an aftermarket replacement designed for Yamaha 40HP, 50HP, and 60HP outboard motors, covering both 2-stroke and 4-stroke models from 1995 through 2009. It ensures a proper seal for your water pump housing, preventing leaks and maintaining optimal cooling performance across a wide range of engine configurations.

This gasket directly replaces Yamaha OEM part number 63D-44316-00, providing a reliable and cost-effective solution for routine maintenance and water pump rebuilds.

• Essential component for water pump service and impeller replacement
• Compatible with both 2-stroke and 4-stroke Yamaha outboards
• Designed for saltwater and freshwater applications

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

Part Type

Water Pump Impeller Gasket

OEM Reference

63D-44316-00

Application

Water pump housing seal

Material

Gasket material designed for marine environment

What's in the Box

This package includes everything you need for gasket replacement:

• 1 × Impeller Gasket (replaces 63D-44316-00)

Installation Notes

1. Disconnect the fuel line and remove the lower unit from the outboard motor following your service manual.
2. Remove the water pump housing and carefully extract the old impeller and gasket. Inspect for wear or damage.
3. Clean all mating surfaces thoroughly, removing old gasket material and debris to ensure a proper seal.
4. Position the new impeller gasket on the water pump housing, aligning all bolt holes.
5. Install the impeller with blades oriented correctly per manufacturer specifications; lubricate with water pump grease.
6. Reassemble the water pump housing, tightening bolts in a crisscross pattern to manufacturer torque specifications.
7. Reinstall the lower unit, reconnect the fuel line, and test the cooling system by running the engine with a water supply.
8. Check for leaks around the gasket area and verify proper water discharge from the tell-tale indicator.

Troubleshooting & FAQ

How do I know if my water pump gasket needs replacement?

Replace the gasket any time you service the water pump or impeller. Signs of failure include coolant leaks around the pump housing, overheating, reduced water flow from the tell-tale, or visible gasket deterioration during inspection.

Can I reuse the old gasket?

No. Gaskets are designed for single use. Reusing a compressed gasket can result in improper sealing, leaks, and overheating. Always install a new gasket during water pump service.

Is this gasket compatible with both 2-stroke and 4-stroke engines?

Yes. This gasket fits Yamaha 40HP, 50HP, and 60HP models in both 2-stroke (1995–2009) and 4-stroke (1995–2009) configurations as listed in the compatibility table.

Do I need any sealant with this gasket?

Typically, no additional sealant is required if surfaces are clean and the gasket is properly seated. Consult your Yamaha service manual for specific recommendations on your model.

How often should I replace the water pump gasket?

Replace the gasket every time you service the impeller or water pump assembly. Most manufacturers recommend impeller service every 2–3 years or 200–300 hours of operation, whichever comes first.

What tools do I need for installation?

You will need basic hand tools including socket wrenches, screwdrivers, a gasket scraper, and a torque wrench. Water pump grease and a service manual for your specific model are also recommended.

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.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.