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

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

This complete water pump impeller repair kit services OMC Cobra stern drives from 1986–1993, including V6 and V8 engine configurations ranging from 2.3L to 7.5L. This kit contains all the necessary components for a full service of the lower unit's water pump assembly.

It is a direct replacement for OMC part numbers 984461 / 0984461, 983895, and 777128, along with several aftermarket equivalents.

• Complete Kit: Includes the water pump housing, gaskets, pump liner, impeller plate, and the impeller itself.
• Installation Type: Designed for external water pump assemblies located on the stern drive.
• Durable Materials: Features a 10-blade neoprene impeller for reliable water flow and a durable plastic housing.

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 Housing (Replaces OMC 984744/Sierra 18-3206)
• 1 x Water Pump Housing Gasket (Replaces OMC 911702/Sierra 18-2916)
• 1 x Pump Liner (Replaces OMC 764197/911844/Sierra 18-3145)
• 1 x Impeller Plate (Replaces OMC 911703/Sierra 18-3121)
• 1 x Water Pump Impeller (Replaces OMC 777128/983895/Sierra 18-3058)
• 1 x Rubber Seal (Replaces OMC 911704/Sierra 18-2541)
• 2 x Drain Screw Gaskets (Replaces OMC 0307552/0500383/Sierra 18-2945) (Note: not confirmed in all kits)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning any work.
2. Remove Drive: Unbolt and remove the complete stern drive unit from the transom assembly.
3. Separate Halves: Place the stern drive on a suitable stand and separate the upper and lower units by removing the main attachment bolts.
4. Access Pump: Unbolt and carefully lift the old water pump housing assembly off the lower unit driveshaft.
5. Clean Surfaces: Thoroughly clean the mounting surfaces on the lower unit, removing all traces of old gasket material.
6. Install New Components: Place the new impeller plate and gasket from the kit onto the lower unit.
7. Insert Impeller: Push the new impeller down into the new pump liner while rotating the driveshaft clockwise to correctly orient the blades.
8. Install Housing: Slide the new housing assembly (with impeller inside) over the driveshaft and onto the lower unit. Secure it with the provided bolts, tightening them to the manufacturer-specified torque.
9. Reassemble: Rejoin the lower and upper units and reinstall the complete stern drive onto the transom.
10. Test System: Reconnect the battery. Once the boat is in the water, start the engine and verify a strong, consistent stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How can I be sure this kit fits my OMC Cobra drive?
This kit is designed for OMC Cobra stern drives made between 1986 and 1993. Please check the "Compatible Engine Models" table to match your specific engine model and year. It is also critical to visually compare our product images to your old parts before ordering. Note: It does not fit models originally equipped with a short impeller or the 1992 5.7 L.E. model.

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 no water stream from the "tell-tale" outlet, and visible cracking, stiffness, or missing blades on the old impeller upon inspection.

How often should I replace the water pump impeller?
As a general maintenance rule, it is recommended to inspect your water pump impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

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.