Water Pump Impeller – Fits OMC Cobra (1986-1993) (Replaces 983895, 777128)
Water Pump Impeller – Fits OMC Cobra (1986-1993) (Replaces 983895, 777128) 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 – Fits OMC Cobra (1986-1993) (Replaces 983895, ...
Product Details
This is a direct-fit Water Pump Impeller for OMC Cobra stern drives from 1986–1993. It is compatible with a wide range of engines, including 2.3L, 3.0L, 4.3L, 5.0L, 5.7L, 5.8L, and 7.5L models, providing reliable performance for your marine cooling system.
This part is a direct replacement for OMC part numbers 983895 and 777128. It also interchanges with Sierra 18-3058 and Mallory 9-45280.
- Installs as a direct-fit replacement for the original impeller.
- Made from high-quality neoprene rubber designed to resist saltwater and wear.
- Engineered to ensure proper cooling system function and prevent engine overheating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| OMC | 983895 |
| OMC | 777128 |
| Sierra | 18-3058 |
| Mallory | 9-45280 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
| Brand | Model | Engine | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| OMC | Cobra | 2.3L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 3.0L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 4.3L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 5.0L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 5.7L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 5.8L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
| OMC | Cobra | 7.5L | 1986–1993 | 983895, 777128 | Used in sterndrive applications |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct Fit
- Material
- High-quality rubber/neoprene
- Color
- Black
- Application
- Marine cooling system
What’s in the Box
- 1 x Water Pump Impeller (Replaces 983895, 777128)
Installation Notes
- Disconnect the boat's battery and close the raw water intake seacock.
- Locate the raw water pump housing on your engine or stern drive.
- Carefully remove the bolts securing the water pump housing cover.
- Note the orientation of the old impeller vanes before removing it. Use pliers or a pick if necessary.
- Clean the inside of the pump housing, removing any old gasket material or debris.
- Lightly lubricate the new impeller and the inside of the housing with a marine-safe lubricant.
- Install the new impeller, ensuring the vanes are oriented in the same direction as the old one (typically turning with engine rotation).
- Reinstall the housing cover with a new gasket (if applicable) and tighten bolts to the manufacturer's specified torque.
- Open the seacock, reconnect the battery, and start the engine.
- Immediately check for water leaks around the pump housing and verify water is flowing from the exhaust.
Troubleshooting & FAQ
How do I confirm this impeller fits my engine?
This impeller is specifically for OMC Cobra stern drives made between 1986 and 1993. Please review the "Engine & Model Compatibility" table and cross-reference your OEM part number with the "Part Number Matrix" to ensure a perfect match.
What are the signs of a failing water pump impeller?
Common symptoms include the engine running hotter than normal, a weak or non-existent stream of water from the exhaust port, and visible signs of damage on the old impeller such as cracked, brittle, or missing vanes.
How often should I replace my impeller?
For preventative maintenance, it is recommended to inspect your impeller annually and replace it every 1-2 boating seasons, or as specified by your engine's service manual. Replacement frequency may vary based on usage hours and water conditions (saltwater, sandy/silty water).
What's the difference between this part and an OEM original?
This is a high-quality aftermarket replacement, not an OEM component. It is engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, material, and performance, offering a reliable and cost-effective alternative.
Is this impeller difficult to install?
Installation is straightforward for those with mechanical experience. It involves accessing the water pump, removing the old unit, and installing the new one. However, due to the critical nature of the cooling system, we recommend professional installation if you are not completely comfortable with the process.
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 and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
- Professional installation is recommended for safety and to ensure optimal performance of your engine's cooling system.
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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
