676-44324-A0 Water Pump Impeller Gasket for Yamaha C40 | JLM Marine

Water Pump Impeller Gasket 676-44324-A0 – Fits Yamaha 2-Stroke 40 HP C40 & OMC 235/240 Stern Drive

This water pump impeller gasket is engineered to fit Yamaha 2-Stroke 40 HP C40 outboards (1990–1997) and OMC Cobra 235/240 stern drive models (1971–1978). It ensures a reliable seal within the water pump assembly, preventing leaks and maintaining optimal cooling performance.

Direct Replacements: 676-44324-A0, 676-44324-A0-00, 676-44324-A1.

• Essential component for water pump maintenance and rebuild kits
• Designed for both outboard and stern drive applications
• Single gasket included for precise installation

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Package Contents

This package includes:

• 1 × Water Pump Impeller Gasket (676-44324-A0)

Installation Guide

1. Disconnect the engine and ensure it is cool before beginning work.
2. Remove the lower unit from the outboard or stern drive following your engine's service manual.
3. Disassemble the water pump housing and remove the old impeller and gasket.
4. Clean all mating surfaces thoroughly, removing any old gasket material or debris.
5. Position the new impeller gasket (676-44324-A0) onto the pump housing, ensuring proper alignment.
6. Install the impeller, ensuring the blades are oriented correctly per manufacturer specifications.
7. Reassemble the water pump housing, torquing fasteners to the specified values.
8. Reinstall the lower unit onto the engine, ensuring all mounting bolts are secure.
9. Refill the lower unit gear oil and check for proper level.
10. Test the cooling system by running the engine in water and verifying consistent water flow from the tell-tale.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my engine?
A: Cross-reference your original part number (676-44324-A0, 676-44324-A0-00, or 676-44324-A1) and verify your engine model and year in the compatibility table above. For Yamaha engines, use the serial number guide linked in the compatibility section.

Q: How often should I replace the water pump gasket?
A: Replace the gasket every time you service or rebuild the water pump, typically every 2–3 years or 200–300 hours of operation. Always use a new gasket during impeller replacement to ensure a proper seal.

Q: What are the signs that my water pump gasket has failed?
A: Common symptoms include overheating, reduced water flow from the tell-tale, visible leaks around the pump housing, or steam coming from the engine. If you notice any of these signs, inspect and replace the gasket immediately.

Q: Can I reuse the old gasket during reinstallation?
A: No, always install a new gasket when servicing the water pump. Reusing old gaskets can lead to improper sealing, leaks, and cooling system failure.

Q: Is this gasket compatible with both outboard and stern drive applications?
A: Yes, this gasket fits Yamaha 40 HP C40 outboards (1990–1997) and OMC Cobra 235/240 stern drives (1971–1978) as specified in the compatibility table.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.