Water Pump Impeller – Fits OMC Cobra (1986-1993) (Replaces 983895, 777128)

Water Pump Impeller – Fits OMC Cobra (1986-1993) (Replaces 983895, 777128)

This aftermarket water pump impeller is engineered for OMC Cobra stern drives mounted on 2.3L, 3.0L, 4.3L, 5.0L, 5.7L, 5.8L, and 7.5L engines from 1986 to 1993. It serves as a direct replacement, ensuring reliable performance in marine cooling systems.

It is designed to directly replace OMC part numbers 983895 and 777128, as well as Sierra 18-3058 and Mallory 9-45280.

• Installation Method: Direct Fit
• Material: Constructed from a durable, high-quality rubber/neoprene compound designed to resist saltwater damage.
• Function: Restores cooling system efficiency to prevent engine overheating.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 983895, 777128)

Installation Guide

1. Disconnect the negative battery cable before starting work.
2. Locate the water pump housing on the lower unit of the sterndrive.
3. Place a drain pan under the housing and remove the drain plug, if applicable, to empty the system.
4. Unscrew the bolts securing the water pump cover and carefully remove the cover.
5. Note the rotational direction of the existing impeller's blades before removal.
6. Pry or pull the old impeller out of the pump housing. Clean any debris or corrosion from inside the housing.
7. Lightly lubricate the inner walls of the pump housing and the new impeller with marine grease.
8. Install the new impeller, ensuring the blades are bent in the correct rotational direction.
9. Reinstall the pump cover, using a new gasket if required, and tighten the bolts to the manufacturer's specified torque.
10. Reconnect all hoses and the negative battery cable.
11. Start the engine and immediately check for proper water flow from the tell-tale outlet and for any leaks around the pump housing.

Troubleshooting & FAQ

How do I confirm this impeller fits my OMC Cobra engine?
This impeller is designed for OMC Cobra stern drives from 1986 to 1993, covering a range of engines from 2.3L to 7.5L. The most reliable way to confirm fitment is to cross-reference your existing part number with those listed: OMC 983895, 777128; Sierra 18-3058; or Mallory 9-45280.

What are the signs of a failing water pump impeller?
Common indicators include the engine running hotter than normal, especially at idle or low speeds, a weak or non-existent water stream from the tell-tale outlet, and, upon inspection, visible cracks, stiffness, or missing blades on the impeller itself.

How often should I replace my water pump impeller?
For preventative maintenance and to ensure engine safety, we recommend inspecting the impeller annually. It should be replaced every 1-2 seasons, depending on usage. If you frequently operate in sandy, silty, or saltwater environments, more frequent replacement is advised.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.