Water Pump Gasket – Fits Yamaha 40HP 2-Stroke Outboards (Replaces 676-44315-A1-00)
Water Pump Gasket – Fits Yamaha 40HP 2-Stroke Outboards (Replaces 676-44315-A1-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Gasket – Fits Yamaha 40HP 2-Stroke Outboards (Replaces 6...
Product Details
This aftermarket Water Pump Gasket is a direct-fit replacement for Yamaha 40HP 2-stroke outboard engines, including models such as the E40GMH and 40GWH. It ensures a proper seal within the water pump assembly to prevent leaks and maintain cooling system efficiency.
It serves as a direct interchange for Yamaha part numbers 676-44315-00-00, 676-44315-A0-00, and 676-44315-A1-00, as well as Mercury equivalents 27-83398 and 83398M.
- Engineered as a direct replacement component for a secure, leak-free fit.
- Crafted from durable gasket material to withstand the marine environment.
- Identified as gasket #31 in the official water pump assembly diagrams.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 676-44315-00-00 | 676-44315-A1-00 | |
| Yamaha | 676-44315-A0-00 | 676-44315-A1-00 | |
| Yamaha | 676-44315-A1-00 | Current OEM Part Number | |
| Mercury | 27-83398 | Cross-reference to Yamaha part | |
| Mercury | 83398M | Cross-reference to Yamaha part |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is documented to fit the following Yamaha 2-stroke outboards. Ensure your model is listed before purchasing.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | E40GMH | 40 | 2-Stroke | 676-44315-A1-00 | Water pump gasket #31 |
| Yamaha | 40GWH | 40 | 2-Stroke | 676-44315-A1-00 | Water pump gasket #31 |
Technical Specs
- Product Type
- Water Pump Gasket
- Installation
- Direct replacement
- Housing Material
- Paper/Gasket material
- Dimensions
- 15.5" L x 10.0" W x 0.5" H
- Weight
- 0.012 lb (0.0054 kg)
- Warranty
- 1 Year (aftermarket parts)
- Other Technical Attributes
- Positioned as gasket #31 in water pump assembly
What’s in the Box
- 1 x Gasket, Water Pump (676-44315-A1-00)
Installation Notes
- Disconnect the battery and disable the ignition system for safety.
- Remove the lower unit (gearcase) from the outboard motor.
- Unbolt and carefully lift the water pump housing.
- Remove the old gasket, ensuring both mating surfaces are clean, dry, and free of old material or debris.
- Position the new gasket correctly onto the water pump plate.
- Reinstall the water pump housing, ensuring proper alignment, and torque the bolts to the manufacturer's specified values.
- Reassemble and attach the lower unit to the outboard motor.
- Reconnect the battery. Before regular operation, test the engine in water to confirm a steady water stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this gasket fits my Yamaha 40HP outboard?
This gasket is designed for specific Yamaha 40HP 2-stroke models like the E40GMH and 40GWH. The most reliable way to confirm fitment is to match your existing part number to 676-44315-A1-00 or its cross-references.
What are the signs of a failed water pump gasket?
Common symptoms include engine overheating at idle or low speeds, a weak or inconsistent stream of water from the "telltale" outlet, or visible water leaks around the water pump housing area on the lower unit.
How often should the water pump gasket be replaced?
It is standard practice to replace the water pump gasket whenever you service the water pump impeller, which is typically recommended every 1–2 years or every 100–200 hours of use, depending on operating conditions and environment (freshwater vs. saltwater).
Is special sealant needed with this gasket?
Generally, this type of gasket is designed to be installed dry. Applying sealant can sometimes cause it to slip out of place during installation or interfere with the seal. Always consult your engine's service manual for specific recommendations.
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 vs 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.
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