Water Pump Gasket – Fits Yamaha 40HP 2-Stroke E40GMH/40GWH (Replaces 676-44324-A1)
Water Pump Gasket – Fits Yamaha 40HP 2-Stroke E40GMH/40GWH (Replaces 676-44324-A1) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Gasket – Fits Yamaha 40HP 2-Stroke E40GMH/40GWH (Replace...
Product Details
This aftermarket Water Pump Gasket is designed for Yamaha 40HP 2-Stroke outboard engines, ensuring a precise fit for E40GMH and 40GWH models. It serves as a direct replacement cartridge gasket, positioned between the outer plate and the water pump housing to maintain a proper seal.
This part directly replaces Yamaha part numbers 676-44324-A1-00 and 676-44324-A0-00, and is an interchange for Mercury/Mariner 27-83399/83399M and Sierra 18-99083.
- Installs between the water pump housing and the outer plate cartridge.
- Corresponds to position #31 in the official gearcase assembly diagrams.
- Engineered for use in the water pump assembly of specified outboard engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 676-44324-A1-00 |
| Yamaha | 676-44324-A0-00 |
| Mercury/Mariner | 27-83399 |
| Mercury/Mariner | 83399M |
| Sierra | 18-99083 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, this gasket is a confirmed fit for the E40GMH and 40GWH series outboards.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yamaha | E40GMH | 40 | 2-Stroke | 676-44324-A1-00 | Located at position #31 in exploded view |
| Yamaha | 40GWH | 40 | 2-Stroke | 676-44324-A1-00 | Located at position #31 in exploded view |
Technical Specs
- Product Type
- Water Pump Gasket (Cartridge Gasket)
- Installation
- Positioned between outer plate cartridge and water pump housing
- Material
- Gasket Material
- Dimensions
- 14.0 cm x 9.8 cm x 0.4 cm
- OEM Part Numbers
- Yamaha: 676-44324-A1-00, 676-44324-A0-00
- Position in Assembly
- #31 in exploded view diagram
What’s in the Box
- 1 x Water Pump Gasket (replaces 676-44324-A1-00)
Installation Notes
- Disconnect the battery cables and shift the engine into neutral.
- Drain the gearcase oil completely into a suitable container.
- Remove the mounting bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.
- Unscrew the bolts holding the water pump housing cover to access the internal components.
- Remove the old gasket, taking care to clean both mating surfaces (the pump housing and the plate) thoroughly to remove any old sealant or residue.
- Position the new gasket (676-44324-A1) onto the clean surface, ensuring it aligns with the bolt holes and water passages.
- Reassemble the water pump, reinstall the lower unit, and refill the gearcase with the manufacturer-specified oil.
- Reconnect the battery and test the engine in a safe water environment, checking for proper water flow from the tell-tale.
Troubleshooting & FAQ
How do I confirm this gasket fits my engine?
This gasket is specifically for Yamaha 40HP 2-Stroke models E40GMH and 40GWH. Please verify your model number and cross-reference the OEM part number (676-44324-A1) against your engine's service manual.
What are the signs of a failing water pump gasket?
A failed gasket can cause water leaks around the pump housing, leading to engine overheating, a weak or non-existent water stream from the tell-tale outlet, or low water pressure alarms.
Where is this gasket installed?
It is located in the lower unit's water pump assembly, specifically between the outer plate cartridge and the water pump housing. It corresponds to diagram reference #31 in most Yamaha service manuals for these models.
How often should I replace the water pump gasket?
It is best practice to replace this gasket, along with the impeller and other seals, during regular water pump service. This is typically recommended every 100 operating hours or annually, whichever comes first.
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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