Impeller Housing Plate Gasket – Fits Evinrude/Johnson Outboard Engines (Replaces OMC 0324449, 324449, 777870)
Impeller Housing Plate Gasket – Fits Evinrude/Johnson Outboard Engines (Replaces OMC 0324449, 324449, 777870) 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
Impeller Housing Plate Gasket – Fits Evinrude/Johnson Outboard Engi...
Product Details
This replacement Impeller Housing Plate Gasket ensures a proper seal for the impeller housing on various Evinrude and Johnson outboard engines. It's an essential component for preventing water leaks within the gearcase and maintaining cooling system integrity.
It serves as a direct interchange for OEM part numbers 0324449, 324449, and 777870, as well as aftermarket equivalents from Sierra, SEI Marine, and GLM.
- Engineered for a precise fit to prevent leaks and ensure optimal performance.
- Resistant to degradation from water, salt, and engine heat.
- Maintains a reliable seal to protect internal gearcase components.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Evinrude Johnson OMC | 0324449 |
| Evinrude Johnson OMC | 324449 |
| Evinrude Johnson OMC | 777870 |
| Sierra Marine | 18-0108 |
| SEI Marine | 95-363-11 |
| GLM | 33511 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson models, this gasket is noted in the gearcase diagram for the J25RWLEDC model.
For Evinrude models, this part is listed as compatible with various engines across all years that specify OEM part number 0324449.
| Brand | Model | Rated HP | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson | J25RWLEDC | 25 | 0324449 | Found in gearcase diagram | |
| Evinrude | All | 0324449 |
Technical Specs
- Product Type
- Gasket, Impeller Housing Plate
- Dimensions
- Height: 4.0 in; Width: 5.13 in; Length: 1.13 in
- Warranty
- Full Warranty (from MarineEngine.com)
What’s in the Box
- 1 x Impeller Housing Plate Gasket (Replaces 0324449/324449/777870)
Installation Notes
- Disconnect the battery and ensure the engine is turned off and cool.
- Drain the gearcase lubricant.
- Remove the lower unit (gearcase) from the outboard motor.
- Unbolt and remove the water pump housing.
- Carefully remove the old impeller housing plate and gasket. Clean both mating surfaces thoroughly, ensuring they are free of old gasket material and corrosion.
- Place the new gasket onto the gearcase surface, followed by the impeller housing plate.
- Align all components correctly and reinstall the water pump housing, torquing the bolts to the manufacturer's specified value.
- Reinstall the lower unit, refill the gearcase with fresh lubricant, and reconnect the battery.
- Start the engine and check for any water leaks around the housing.
Troubleshooting & FAQ
How do I know if my impeller housing gasket is failing?
Signs of a failing gasket include water in the gearcase oil (milky appearance), an overheating engine at idle or low speeds, or visible water leaks from the lower unit seams. A reduction in the water stream from the tell-tale can also indicate a cooling system issue related to the water pump.
Can I reuse my old gasket?
No. Gaskets are single-use components designed to crush and create a seal. Reusing an old gasket will almost certainly result in leaks and potential engine damage. Always replace the gasket whenever the impeller or water pump housing is serviced.
When should this gasket be replaced?
This gasket should be replaced every time the water pump impeller is changed, which is recommended every 1-2 years or every 100-200 hours of use, depending on operating conditions (especially in saltwater).
Is this part the same as the upper housing gasket?
No, this is specifically the impeller housing *plate* gasket, which sits between the gearcase and the plate under the impeller. Always consult your engine's service diagram to ensure you are ordering the correct gasket for the specific location.
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.
Payment & Security
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