SOXAMARINE Raw Water Pump Impeller Kit 359978 for Kohler GM 28487/359341 — Includes O‑Ring, OEM Fit

SOXAMARINE 359978 is a complete raw sea water pump impeller and seal kit designed to replace Kohler OEM impeller 359978 for pumps GM 28487, GM 359341 and GM63535.

Keep your Kohler marine generator's raw water cooling system running reliably with this service kit from SOXAMARINE. The kit includes the molded rubber impeller and the pump cover O-ring needed to restore correct flow and sealing after wear, fouling or seasonal storage. It’s tailored to fit specific Kohler pumps used across multiple gasoline generator and engine models, making it a practical on-board spare or workshop repair piece.

Which Kohler pumps and engines does this kit fit?

This kit is engineered to match Kohler pump part numbers GM 28487, GM 359341 and GM63535 and is recommended as the OEM replacement 359978. It supports a range of Kohler gasoline generator and engine model families used in marine cooling systems.

• Compatible pump part numbers: GM 28487, GM 359341, GM63535
• OEM replacement number: 359978 (23-3314 minor raw water impeller kit)
• Fits generator/engine model lines such as 4EFCD, 5ECD, 6EFCD, 7.3ECD
• Also fits 4EFKD, 5EKD, 6EFKD, 7.5EKD, 8EFKD, 10EKD with corresponding maintenance kits

What parts are included and what condition should I expect?

The package contains the molded impeller and the pump cover O-ring needed for a standard impeller service. Components arrive ready to install; confirm parts visually before fitting and replace any additional worn components such as the pump housing gasket if needed.

• One SOXAMARINE impeller, part number 359978
• Pump cover O-ring, part number 23447
• Packaged as shown in product photos for straightforward identification
• New, non-refurbished components intended for replacement service

How do I know when to replace the impeller and O-ring?

Replace the impeller and O-ring if you notice reduced coolant flow, cavitation noise, visible blade wear, or if the engine overheats during normal operation. Scheduled seasonal inspection and replacement after prolonged storage is common practice for raw water pumps.

• Signs: reduced flow, overheating, vibration or unusual pump noise
• Visual cues: cracked, missing, or deformed impeller blades
• Preventive change: at least annually or per engine service interval
• Always inspect the pump housing and keyway for wear when replacing

Can I install this kit myself and what tools are typical?

Basic mechanical skills and common hand tools are normally sufficient to replace the impeller and O-ring. Follow the engine manufacturer’s service instructions and observe safety precautions when working on the cooling system and engine.

• Typical tools: screwdriver, pliers, hex sockets and water pump puller if required
• Use a light coating of appropriate lubricant on the O-ring for easier seating
• Verify blade rotation direction and key alignment on the shaft during fit
• Run the system after installation to check for leaks and correct flow

Who this is for: This SOXAMARINE 359978 service kit is aimed at boat owners, marine technicians and fleet maintainers who service Kohler gasoline generators or engines that use the specified raw water pumps. It's a practical spare for routine maintenance or emergency replacement for vessels that operate in saltwater environments and need reliable cooling system performance.