Water Pump Impeller Gasket for Yamaha C40/CV40 2-Stroke Outboards – Replaces 676-44324-A0

Product Details

This water pump impeller gasket is an aftermarket replacement gasket for select Yamaha 2-stroke outboard water pump applications. It is listed as a replacement for Yamaha OEM part number 676-44324-A0 and is intended to help restore a clean seal between the water pump components during water pump service.

Catalog fitment identifies this gasket for Yamaha C40 2-stroke outboards from 1991–1997 and CV40 2-stroke outboards from 1990. Confirm the engine model, year, and original gasket before ordering.

• Water pump gasket for the impeller and pump housing assembly
• Aftermarket replacement for Yamaha OEM part number 676-44324-A0
• Designed for the listed Yamaha C40 and CV40 2-stroke applications
• Single gasket supplied; water pump, impeller, fasteners, and sealant are not included

Part Number Matrix

Use the following reference to compare the replacement gasket with the documented Yamaha OEM number.

Engine & Model Compatibility

Fitment is limited to the model and year conditions shown below. Model, year, and 2-stroke configuration should be confirmed together before installation.

Technical Specs

Part Type

Water pump impeller gasket

Application

Yamaha C40 2-stroke outboards, 1991–1997; Yamaha CV40 2-stroke outboards, 1990

OEM Replacement Reference

Yamaha 676-44324-A0

Product Type

Single replacement gasket, not a kit

Material

Gasket sealing material; exact material composition is not specified

What's in the Box

• 1 × Water pump impeller gasket

Only the gasket is included. The impeller, water pump housing, bolts, and other service parts must be purchased separately if required.

Installation Notes

1. Make sure the engine is stopped, cool, and safely supported before beginning service.
2. Remove the lower unit and water pump components according to the applicable Yamaha service manual.
3. Remove the old gasket and clean the mating surfaces without gouging the pump housing or plate.
4. Inspect the impeller, pump housing, wear plate, key, and fasteners for wear or damage. Replace worn components as necessary.
5. Position the new gasket in the same location as the original, aligning every opening and bolt hole.
6. Reassemble the water pump using the service manual procedure and the manufacturer's torque specifications.
7. Reinstall the lower unit and verify a steady cooling-water telltale stream before returning the outboard to service.

Follow the engine manufacturer's service procedures. Do not rely on this page for torque values or model-specific disassembly instructions.

Troubleshooting & FAQ

Which Yamaha engines does this gasket fit?

The documented fitment is Yamaha C40 2-stroke outboards from 1991–1997 and Yamaha CV40 2-stroke outboards from 1990. Confirm the exact model and year before ordering.

What OEM number does this gasket replace?

This gasket is listed as a replacement for Yamaha OEM part number 676-44324-A0.

Is this a complete water pump kit?

No. This is a single replacement gasket. It does not include an impeller, water pump housing, wear plate, key, bolts, or other water pump components.

Can I reuse the old gasket?

Gaskets should generally be replaced during water pump service, particularly when the original gasket is compressed, damaged, hardened, or removed from the mating surfaces.

What should I check before ordering?

Check the engine model, model year, 2-stroke configuration, and the number on the original gasket or service documentation. Compare the gasket shape and openings before installation.

Does this gasket fit OMC Cobra stern drives?

No OMC Cobra stern drive fitment is confirmed for this listing. The documented application is limited to the Yamaha C40 and CV40 outboard conditions shown above.

Is this an OEM Yamaha part?

No. This listing is for an aftermarket replacement gasket that references Yamaha OEM part number 676-44324-A0 for application identification.

Safety & Important Info

• Verify the complete engine model, year, stroke configuration, and original gasket before purchase.
• Use the appropriate Yamaha service manual for lower-unit removal, pump disassembly, reassembly, and torque specifications.
• Do not operate the outboard without an adequate cooling-water supply.
• Stop operation immediately if the engine overheats or the telltale water stream is weak or absent.
• This is an aftermarket replacement, not an OEM Yamaha component.

About Sea Sierra

• Marine replacement parts selected for common service and repair applications.
• Clear part-number and fitment information to help support accurate ordering.
• Parts supplied for installation by qualified owners or marine technicians.