Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L (Replaces 984461, 777128, 983895)
Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L (Replaces 984461, 777128, 983895) 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
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Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L (Replaces 984461...
Product Details
This Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L Stern Drives (Replaces 984461, 777128, 983895) is designed for a precise fit on a wide range of OMC Cobra engines from 1986–1993. Compatible models include 2.3L (1987–1990), 2.5L (1986), 3.0L (1986–1993), 4.3L (1986–1993), 4.6L (1989), 5.0L (1986–1993), 5.7L (1986–1993), 5.8L (1989–1993), and 7.5L (1987–1989). It is not compatible with 1990 2.3L models, King Cobra (1992 and later), or Cobra SX drives.
This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including OMC 984461 / 0984461, OMC 765582 / 0765582, Sierra 18-3348, Sierra 18-3212-1, Mallory 9-45285, and GLM 12091.
- Engineered as a direct-fit replacement for straightforward installation.
- Includes a new nylon housing, neoprene impeller, and all necessary gaskets and seals.
- Constructed with a stainless steel wear plate for enhanced durability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 984461 / 0984461 |
| OMC | 765582 / 0765582 |
| Sierra | 18-3348 |
| Sierra | 18-3212-1 |
| Mallory | 9-45285 |
| GLM | 12091 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For OMC Cobra Stern Drives:
| Model | Engine | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| 232 | 2.3L | 1987–1990 | 984461 | Except 1990 2.3L |
| 252 | 2.5L | 1986 | 984461 | |
| 302 | 3.0L | 1986–1993 | 984461 | |
| 432/434 | 4.3L | 1986–1993 | 984461 | |
| 4.6L | 4.6L | 1989 | 984461 | |
| 502/504 | 5.0L | 1986–1993 | 984461 | |
| 574 | 5.7L | 1986–1993 | 984461 | |
| 584 | 5.8L | 1989–1993 | 984461 | |
| 754 | 7.5L | 1987–1989 | 984461 |
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- Direct replacement
- Housing Material
- Nylon (Housing), Neoprene Rubber (Impeller and O-rings), Stainless Steel (Wear Plate)
- Weight
- 300g (10.58 oz)
- Impeller Blade Count
- 10
- Impeller Outer Diameter
- 58.7 mm (2.31 inch)
- Impeller Height/Thickness
- 41 mm (1.615 inch)
- Impeller Shaft/Hub Size
- 12.5 mm (0.491 inch)
What’s in the Box
- 1 x Water Pump Impeller (Replaces 777128, 983895, Sierra 18-3058)
- 1 x Water Pump Housing (Replaces 984744, Sierra 18-3206)
- 1 x Water Pump Housing Gasket (Replaces 911702, Sierra 18-2916)
- 1 x Water Pump Liner (Replaces 764197, 911844, Sierra 18-3145)
- 1 x Impeller Plate (Replaces 911703, Sierra 18-3121)
- 1 x Rubber Seal (Replaces 911704, Sierra 18-2541)
Installation Notes
- Disconnect the battery and close the fuel and water inlets.
- Drain the cooling system to prevent water spillage.
- Access and carefully remove the existing water pump assembly from the sterndrive.
- Remove the old impeller, housing, and gaskets. Note the orientation of the old parts.
- Thoroughly clean all mating surfaces to ensure a proper seal.
- Install the new wear plate, gasket, and impeller into the new housing. Lubricate the impeller with a suitable marine grease.
- Install the new housing assembly onto the sterndrive, ensuring all bolts are torqued to manufacturer specifications.
- Reconnect all hoses and lines.
- Open water inlets, reconnect the battery, and start the engine. Check immediately for proper water circulation and leaks.
Troubleshooting & FAQ
Will this kit fit my 1990 2.3L OMC Cobra engine?
No. According to the compatibility data, this kit specifically excludes the 1990 2.3L OMC engine model. Please verify your engine details before purchasing.
What are the signs of a failing water pump impeller?
Common signs of a worn or damaged impeller include the engine running hotter than normal, a weak or non-existent water stream from the tell-tale outlet, and visible cracks or damage to the impeller blades upon inspection.
How often should I replace my sterndrive's impeller?
For preventative maintenance, it is recommended to replace the impeller every one to two years, or per your engine manufacturer's service schedule. Replacement intervals can vary based on usage (freshwater vs. saltwater) and operating hours.
Does this kit include the housing?
Yes, this is a complete kit that includes the water pump housing, impeller, wear plate, liner, gasket, and seal, as listed in the "What's in the Box" section.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. The part is manufactured in an ISO 9002 facility and is batch-inspected for quality and consistency.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options will appear at checkout where available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is recommended for safety and optimal 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 quality control.
Payment & Security
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