GHmarine MerCruiser Alpha One Gen 2 Water Pump Impeller Kit 43026Q06 — neoprene impeller, gaskets & seals

GHmarine 43026Q06 is a full replacement impeller kit engineered to restore cooling performance in MerCruiser Alpha 1 Gen 2 sterndrives and compatible outboards.

This GHmarine kit contains the key components needed when servicing the water pump on specified MerCruiser and compatible outboard models. The set includes a neoprene impeller plus wear plate, gaskets, seals, key and hardware so you can replace worn parts in a single maintenance session. It’s sized and specified to match the MerCruiser Alpha One Gen 2 water pump requirements and fits a range of engine models listed by serial and horsepower.

Will this kit fit my MerCruiser Alpha One Gen 2 engine?

This kit is intended for Alpha One Gen 2 sterndrives and certain outboards; compatibility depends on model and serial range. Check your engine’s model year, horsepower and serial number against the listed fit details before ordering.

• Fits Alpha One Gen 2 models covering 75–115 hp 4-stroke and 70–90 hp 2-cycle outboards (serial 0A996142 and above).
• Compatible with some 100–125 hp 2-cycle (4-cylinder) models that use pump covers without insulator screws.
• Also fits V‑200/225/250 (3.0L) 2‑cycle outboards where the same pump geometry is used.

What parts are included and why they matter?

The kit supplies every wearable component typically replaced during a pump rebuild, reducing the chance of a missed part during on-boat service. Replacing the impeller and mating parts together restores flow and prevents immediate rework due to degraded gaskets or seals.

• GHmarine neoprene impeller: flexible vanes for reliable water flow.
• Wear plate and metal gasket: protect mating surfaces and ensure sealing.
• Seals and O-rings: prevent leaks around the pump housing and shaft.
• Key, washers, grommet and oil seal: secure the impeller and maintain shaft integrity.

How difficult is installation and what tools are needed?

Installation is a standard mechanical task for someone comfortable with outboard or sterndrive service; it generally requires basic hand tools and a clean workspace. Follow your engine manufacturer’s service manual for torque specs and assembly order to avoid damage.

• Common tools: socket set, screwdrivers, pliers, torque wrench for cover fasteners.
• Helpful extras: pump puller or impeller removal tool, gasket scraper, marine-grade lubricant.
• Time estimate: typically 1–2 hours for experienced DIYers; longer if out of the water precautions are needed.

How does replacing the impeller improve engine performance?

A properly functioning impeller ensures consistent raw-water circulation through the cooling system, protecting engine components from overheating and reducing wear. While replacing the impeller doesn’t boost power, it preserves reliability and prevents heat-related damage that can lead to costly repairs.

• Restores consistent coolant flow rate and pressure.
• Reduces risk of cavitation and localized overheating.
• Extends life of heat exchangers and exhaust components by maintaining correct temperatures.

Who is this for: Boaters, marine technicians, and DIY mechanics who own MerCruiser Alpha One Gen 2 sterndrives or compatible outboards and need a complete, ready-to-install water pump impeller service kit. It’s geared toward anyone performing routine maintenance or preparing a vessel for the boating season who wants a single package that includes all wear items typically replaced during a pump rebuild. Always verify model and serial compatibility with your engine manual before installing.