UANOFCN OMC Cobra Impeller Kit for 1986–1993 SternDrives — Neoprene Direct-Fit Replacement

The UANOFCN 984461 water pump impeller kit is a direct-fit replacement for many OMC Cobra stern drive cooling pumps from 1986–1993, restoring reliable water flow and engine cooling when installed correctly.

Keeping an outboard stern drive cool depends on a flexible, properly seated impeller — that’s where this UANOFCN kit comes in. Built from a neoprene rubber compound, the impeller is engineered to flex and seal against the housing, helping maintain consistent coolant circulation. The kit is designed to match several OMC Cobra models and cross-references common OEM part numbers to simplify selection and installation.

Which OMC Cobra engines and years will this kit fit?

This impeller kit fits a range of OMC Cobra stern drive engines produced between 1986 and 1993, but there are a few important exceptions. Always verify your engine model and year before ordering to ensure compatibility.

• Compatible: OMC Cobra 2.3 (1987–1990), 2.5 (1986), 3.0 (1986–1993), 4.3 (1986–1993), 4.6 (1989)
• Not compatible: 1990 2.3L and King Cobra models 1992 and later
• Intended for stern drive cooling pump applications on listed OMC engines

What OEM part numbers does this UANOFCN replacement correspond to?

The kit replaces several commonly referenced OEM impeller housing and impeller part numbers, making it straightforward to match with service manuals or parts lists. If your parts list includes any of the numbers below, this kit is a likely match.

• Replaces OMC part numbers: 984461, 777128, 983895, 984744
• Packaged and sized to align with OEM housings for the listed engines
• Simplifies ordering when original part numbers are worn or unavailable

What materials and performance characteristics does this impeller kit offer?

UANOFCN manufactures this impeller from a neoprene rubber compound chosen for flexibility and durability in marine cooling systems. The material resists normal wear and seals effectively against the pump housing to preserve water flow under varied RPM ranges.

• Neoprene rubber impeller for flexibility and wear resistance
• Kit built to meet or exceed OEM fit and reliability standards
• Designed for straightforward installation and correct seating

How easy is installation and what should I check during replacement?

Installation is intended to be a direct replacement for the matching OMC Cobra pumps, but basic mechanical skill and common tools are required. Inspect the pump housing, seals, and coolant passages while replacing the impeller to ensure a long service life.

• Direct replacement sizing for proper fit and alignment
• Check housing for grooves, corrosion, or debris before fitting
• Lubricate and seat the impeller properly to avoid premature failure

Who is this for: Boat owners, marine technicians, and DIY mechanics who operate or service OMC Cobra stern drives from the specified years and need a reliable, OEM-compatible impeller replacement. It’s especially useful for those restoring older boats, prepping for seasonal use, or replacing worn cooling components to maintain engine temperature control and prevent overheating-related damage. Verify your engine model and year and compare OEM part numbers before purchasing to ensure correct fitment.