SeaSierra Water Pump Kit for MerCruiser Alpha One Gen 2 — Complete Impeller & Seal Set (43026Q06)

The SeaSierra 43026Q06 Water Pump Kit is a complete replacement set engineered to restore cooling flow in MerCruiser Alpha One Gen 2 sterndrive gearcases.

This kit gathers all the components you need to service the raw-water cooling circuit on compatible MerCruiser Alpha One Gen 2 drives and select Force outboards. It replaces several OEM and aftermarket part numbers, so whether you’re maintaining a routine service schedule or repairing a worn impeller, this single-package solution saves parts hunting and reduces downtime. All items are grouped for straightforward installation and include the impeller, gaskets, seals, hardware and coupling assembly.

What parts are included and which originals does it replace?

The SeaSierra kit contains the impeller 43026T2 plus an impeller plate, impeller key, O-ring, seal ring gasket, impeller gasket, drain screw gasket and a coupling assembly. It’s intended as a drop-in replacement for multiple factory and aftermarket part numbers.

• Includes: impeller, plate, key, O-ring, seal ring gasket, impeller gasket, drain screw gasket, coupling assembly
• Replaces MerCruiser numbers such as 47-43026Q06, 47-43026Q5 and related variants
• Also matches aftermarket Sierra 18-3214

Which drives and engines is this compatible with?

This Water Pump Kit fits MerCruiser Alpha One Gen 2 drives with serial numbers 0D469859 and above, and it’s compatible with certain Force 2-stroke outboard models in 75–120 HP ranges. Verify your drive serial and engine model before purchasing to ensure fitment.

• Designed primarily for MerCruiser Alpha One 1 Gen 2 sterndrives
• Compatible with some Force 2-stroke 75–90–120 HP outboards
• Works for gearcases meeting the listed serial number threshold

How will installing this kit affect performance and maintenance?

Replacing the impeller and associated seals restores proper raw-water circulation, which helps maintain stable engine temperature under load. While not a performance upgrade, fresh elastomer and intact gaskets reduce the risk of overheating and water leaks, leading to more reliable operation and fewer emergency repairs.

• Restores designed cooling flow by replacing worn impeller vanes
• New seals and gaskets reduce leak points and improve reliability
• Complete kit minimizes missing-part issues during service

What should I know before attempting installation?

Installation typically requires basic mechanical tools and access to the lower unit; it’s often done during routine lower-unit service. Inspect the housing for corrosion or scoring, lubricate the new impeller lightly for easier installation, and replace worn fasteners or corroded components to ensure a lasting repair.

• Check lower-unit housing for damage before fitting new parts
• Lightly coat impeller for easier installation and initial priming
• Follow torque specs and alignment for the coupling assembly

Who is this for: boat owners, marine mechanics and service shops working on MerCruiser Alpha One Gen 2 sterndrives and compatible Force outboards who need a single, complete replacement pack for scheduled maintenance or impeller failure repairs. If you want to avoid one-off parts searching and ensure you have gaskets, seals and the coupling needed for a proper lower-unit water pump job, this SeaSierra kit is intended to simplify the service process.