Water Pump Impeller Kit – Fits OMC Cobra Stern Drives 2.3–7.5L (Replaces 984461, 983895, 984744)

Water Pump Impeller Kit – Fits OMC Cobra Stern Drives 2.3–7.5L (Replaces 984461, 983895, 984744)

This water pump impeller repair kit is designed for a wide range of OMC Cobra stern drive applications, including 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) models.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Sierra 18-3348, Mercury/Quicksilver 18-3348, OMC 984461 / 983895 / 984744, EMP 46-03638, and GLM 12091. Note: This kit is not compatible with King Cobra OMC models.

• Complete Assembly: Includes the impeller, housing, wear plate, liner, gasket, and O-ring for a full service.
• Durable Construction: The housing is made from high-strength Nylon/Plastic to resist corrosion and wear.
• Direct Replacement: Engineered to meet OEM specifications for a direct fit and hassle-free installation.

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 OMC 777128/765582)
• 1 x Impeller Wear Plate
• 1 x Pump Housing
• 1 x Pump Liner
• 1 x Gasket
• 1 x O-ring

Installation Guide

1. Disconnect the negative battery cable to ensure safety.
2. Remove the stern drive's lower unit from the upper housing.
3. Unscrew the bolts holding the water pump housing in place and remove the old assembly.
4. Thoroughly clean the mounting surfaces, removing any old gasket material or sealant.
5. Install the new gasket and impeller wear plate onto the lower unit.
6. Place the new impeller inside the new housing. You may use a small amount of soapy water or lubricant to ease insertion.
7. Carefully mount the new pump housing assembly, ensuring the drive shaft is correctly aligned.
8. Tighten the mounting bolts to the manufacturer's recommended torque specifications.
9. Reinstall the lower unit onto the stern drive.
10. Reconnect the battery, start the engine in a water supply, and immediately check for a steady stream of water from the exhaust/telltale outlet.

Troubleshooting & FAQ

How do I know if this water pump kit will fit my OMC Cobra engine?

This kit is designed for OMC Cobra stern drives from 1986 to 1993, covering various engine sizes from 2.3L to 7.5L. Please review the "Compatible Engine Models" table to verify your specific model and year range. It is critical to note that this kit does not fit King Cobra models.

What are the signs that my water pump impeller needs to be replaced?

Common signs of a failing impeller include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the engine's telltale outlet, or a complete lack of water output. Upon inspection, visible damage like cracked, brittle, or missing vanes on the old impeller confirms it needs immediate replacement.

How often should I replace my water pump impeller?

For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of engine operation. Replacement intervals should be shorter if you operate primarily in saltwater or sandy/silty conditions.

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.