Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L Stern Drives (Replaces 984461, 777128, 983895)

Water Pump Impeller Kit – Fits OMC Cobra 2.3L–7.5L Stern Drives (Replaces 984461, 777128, 983895)

This water pump impeller repair kit is designed for a wide range of OMC Cobra stern drives from 1986–1993, covering engines from 2.3L to 7.5L. It provides a reliable solution for maintaining your engine’s cooling system. Please note, this kit is not compatible with the 1990 2.3L model, King Cobra (1992 and later), or Cobra SX stern drives.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including OMC 984461 / 0984461, 765582 / 0765582, Sierra 18-3348, Mallory 9-45285, and GLM 12091.

• Complete Repair Kit: Includes the impeller, housing, gaskets, wear plate, and seals necessary for a full replacement.
• Durable Materials: Constructed with a tough nylon housing, high-performance neoprene impeller and O-rings, and a stainless steel wear plate for longevity.
• Direct Installation: Engineered to match OEM specifications for a direct fit, simplifying the installation process.

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 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 Guide

1. Disconnect Power: Disconnect the battery before starting work.
2. Drain Lubricant: Drain the gear lube from the stern drive's lower unit.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit assembly from the upper housing.
4. Access Old Pump: Locate and remove the bolts securing the old water pump housing. Lift the housing off the driveshaft.
5. Clean Surfaces: Thoroughly clean the mounting base and remove any old gasket material or sealant.
6. Assemble New Kit: Install the new housing gasket, wear plate, and liner onto the lower unit.
7. Install Impeller: Lightly lubricate the impeller and slide it onto the driveshaft, rotating it clockwise to seat it in the housing.
8. Secure Housing: Apply a suitable sealant to the bolt threads, place the new housing over the impeller, and tighten the bolts to the manufacturer's specified torque.
9. Reassemble: Reinstall the lower unit to the upper housing, ensuring the driveshaft and water tube are properly aligned.
10. Refill and Test: Refill the lower unit with fresh gear lube. Reconnect the battery. Start the engine using a water supply and check for a steady water stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: Check the "Compatible Engine Models" table and the "Part Number Cross-Reference" to ensure your OMC Cobra model and year are listed. This kit fits 2.3L to 7.5L stern drives from 1986–1993, but specifically excludes the 1990 2.3L model, King Cobra, and Cobra SX drives.

Q: How often should I replace my water pump impeller?
A: To prevent overheating and ensure engine safety, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use. Replacement frequency depends on operating conditions (e.g., saltwater vs. freshwater).

Q: What are the signs of a failing water pump?
A: Common signs of failure include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the tell-tale outlet, and visible damage (cracks, stiffness, or missing blades) on the old impeller upon inspection.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.