Water Pump Impeller Kit – Fits OMC Cobra Gearcase Assemblies (Replaces 984461, 777128, 983895)
Water Pump Impeller Kit – Fits OMC Cobra Gearcase Assemblies (Replaces 984461, 777128, 983895) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits OMC Cobra Gearcase Assemblies (Repla...
Product Details
This Water Pump Impeller Kit – Fits OMC Cobra Gearcase Assemblies is engineered for OMC Cobra sterndrive gearcase assemblies from 1986–1993. It's fully compatible with a wide range of engine models, including 2.3L, 3.0L, 4.3L, 5.0L, 5.7L, and 5.8L variants, ensuring broad application for many sterndrive setups.
The kit serves as a direct replacement for OMC part numbers 984461, 777128, and 983895, as well as Sierra equivalents 18-3212-1 and 18-3348, providing a comprehensive interchange solution.
- Engineered for direct replacement in the lower gearcase assembly.
- Installation requires Johnson/Evinrude gasket compound (or equivalent) for a proper seal.
- Kit contains all necessary gaskets, seals, and the impeller for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 984461 |
| OMC | 777128 |
| OMC | 983895 |
| Sierra | 18-3212-1 |
| Sierra | 18-3348 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is specifically designed for OMC Cobra sterndrive applications within the specified year range.
| Model | Engine | Years | OEM Part No. |
|---|---|---|---|
| OMC Cobra | 2.3L | 1987–1990 | 984461 |
| OMC Cobra | 2.5L | 1986 | 984461 |
| OMC Cobra | 3.0L | 1986–1993 | 984461 |
| OMC Cobra | 4.3L | 1986–1993 | 984461 |
| OMC Cobra | 4.6L | 1989 | 984461 |
| OMC Cobra | 5.0L | 1986–1993 | 984461 |
| OMC Cobra | 5.7L | 1986–1993 | 984461 |
| OMC Cobra | 5.8L | 1986–1993 | 984461 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct replacement for lower gearcase assembly
- Warranty
- 1 Year (JLM Marine)
- Other Technical Attributes
- Requires Johnson/Evinrude gasket compound for installation
What’s in the Box
- 1 x Impeller (Replaces OMC 983895 / 777128)
- 1 x O-ring type outside seal area (Replaces OMC 911704)
- 1 x Liner (Replaces OMC 911844)
- 1 x Wear plate (Replaces OMC 911703)
- 1 x Gasket (Replaces OMC 911702)
Installation Notes
- Disconnect the battery and ensure the engine is off and cool.
- Place the sterndrive in the full tilt position to access the lower unit.
- Drain the gearcase oil into a suitable container.
- Remove the propeller and the bolts securing the lower gearcase to the upper housing.
- Carefully separate the lower unit from the upper housing, minding the shift shaft.
- Unbolt and remove the old water pump housing assembly.
- Clean all mating surfaces thoroughly, removing any old gasket material.
- Install the new wear plate, gasket, impeller, and liner. Use a light coat of grease on the impeller to ease installation.
- Apply Johnson/Evinrude gasket compound (or equivalent) to the new gasket surfaces as required for a proper seal.
- Reassemble the pump housing and torque bolts to the manufacturer's specification.
- Reinstall the lower unit, ensuring the water tube and shift shaft align correctly, and reconnect all components.
- Refill the gearcase with fresh oil and test the engine in the water, confirming water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller kit fits my OMC Cobra?
This kit fits most OMC Cobra sterndrives made between 1986 and 1993 with 2.3L to 5.8L engines. The best method for confirmation is to cross-reference your existing part number with the numbers listed in our Part Number Matrix (984461, 777128, 983895). Also, check the compatibility table to ensure your specific model and year are listed.
Is the pump housing included in this kit?
No, the housing is not included. This kit (replaces 984461) contains the impeller and associated seals, plate, and liner. If you need a complete kit that includes the housing, you should look for a kit that replaces OMC part number 984744.
Do I need any special sealants for installation?
Yes. The installation notes specify that Johnson/Evinrude gasket sealing compound (or an equivalent marine-grade sealant) is required on the gasket surfaces to ensure a watertight and durable seal.
What are the signs of a failing water pump impeller?
Common signs include engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, a melted or brittle appearance of the old impeller upon inspection, and cracks or missing vanes on the impeller.
How often should I replace my water pump impeller?
As a general maintenance guideline, it is wise to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions. More frequent replacement is recommended if you operate in sandy, silty, or saltwater environments.
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
