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

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

This water pump impeller service kit is designed for OMC Cobra Stern Drive engines from 1986–1993, including 2.3L, 2.5L, 3.0L, 4.3L, 5.0L, 5.7L, 5.8L, and 7.5L models. It is not compatible with OMC Cobra SX or Stringer drives.

This kit serves as a direct replacement for OMC part numbers 983895, 984461, and 984744. It also cross-references with Sierra 18-3058, Mallory 9-45280, GLM 89950, and SEI Marine 96-109-03/96-109-01K.

• Installation Location: Mounts in the OEM Cobra Stern Drive upper gear housing.
• Complete Kit: Includes the impeller, gasket, and O-ring for a full service replacement.
• Durable Material: The impeller is crafted from a robust CR-Neoprene and hardened Nylon blend for longevity.

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 × Water Pump Impeller (Replaces 983895/0983895)
• 1 × Seal O-ring (Replaces 911704/0911704)
• 1 × Gasket (Replaces 911702/0911702)
• 1 × Installation Instructions

Explosion Diagram

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning work.
2. Access the Pump: Locate and access the stern drive's upper gear housing to reach the water pump assembly.
3. Remove Housing Cover: Carefully unbolt and remove the water pump housing cover and its gasket.
4. Extract Old Impeller: Note the blade direction and remove the old impeller from the housing.
5. Clean Surfaces: Thoroughly clean the inside of the pump housing and the gasket mating surfaces. Remove any debris or old gasket material.
6. Install New Impeller: Lightly lubricate the new impeller and housing interior. Install the impeller by rotating the driveshaft clockwise to help seat the blades.
7. Install New Gasket & O-Ring: Place the new gasket and seal O-ring into position on the housing.
8. Reassemble: Reinstall the pump housing cover and tighten the bolts to the manufacturer's specified torque.
9. Test Operation: Reconnect the battery, start the engine with a proper water supply, and check for leaks and proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit fits a wide range of OMC Cobra stern drives from 1986–1993. Please check the "Compatible Engine Models" table and confirm your specific model and year. It is crucial to also verify that your engine does not use a short impeller or has been retrofitted with a short impeller kit, as this part will not fit those applications.

Why does my old impeller look different? Some OMC engines used a shorter impeller.
This kit is for the standard-height impeller (1.615" / 41.0 mm). Certain 2.3L and 3.0L models, among others, may have been originally equipped or later retrofitted with a shorter impeller. If your existing impeller is shorter, this kit is not compatible. Always measure your old part if you are unsure.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage (hours) and water conditions (saltwater, silty/sandy water). Proactive replacement prevents overheating due to impeller failure.

What are the signs of a failing impeller?
Common signs include a weak or no stream of water from the engine's tell-tale outlet, rapidly rising engine temperature at idle, or an engine overheat alarm. Visible damage like cracked, brittle, or missing blades on the old impeller also indicates immediate replacement is needed.

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.