SeaSierra Mercruiser Alpha One Gen 2 Water Pump Repair Kit (Serial 0D469859+), Complete Impeller & Seals

SeaSierra's 8M0100526 water pump repair kit restores cooling flow for Mercruiser Alpha One Gen 2 sterndrive engines.

This complete impeller kit is built as a drop-in replacement for worn or damaged Mercruiser Alpha One Gen 2 water pumps (serial 0D469859 and above). It includes the impeller, seals, faceplate and gaskets needed to refresh the pump’s internal components and help maintain proper raw-water circulation. SeaSierra supplies OEM-matching and aftermarket-equivalent parts with decades of marine parts experience, so you replace what matters without unneeded extras.

What exactly is included in this Mercruiser Alpha One Gen 2 repair kit?

The kit collects all small components required to rebuild the pump housing around the impeller rather than replacing the entire unit. Parts are selected to match the original fit and function for Alpha One Gen 2 sterndrives.

• Water pump impeller (part 43026T2) tailored to the Gen 2 housing
• Impeller key (43037) for rotor alignment
• Faceplate (8172761) and primary gaskets (8172771, modified gasket 430331)
• Seals and additional hardware to reseal the pump assembly

How do I know this kit fits my engine?

Fit is determined by sterndrive model and serial range. This SeaSierra kit is made for Mercruiser Alpha One Gen 2 drives with serial numbers 0D469859 and higher, and it replaces several OEM and aftermarket references.

• Compatible with Mercruiser Alpha One Gen 2 sterndrives (serial 0D469859+)
• Replaces OEM numbers such as 8M0100526, 43026Q06 and related variants
• Also replaces aftermarket references like Sierra 18-3214 and 18-3265

What benefits will I see after installing this repair kit?

Installing the kit restores impeller-driven raw-water flow, reduces the risk of cavitation and overheating from a degraded impeller, and prolongs the service life of the cooling circuit when installed correctly.

• Improved water circulation through the engine’s cooling passages
• Minimized air leaks and seal failures from new gaskets and seals
• Cost savings versus buying a full pump housing when only internals are worn

What should I prepare and expect during installation?

Basic mechanical ability and common marine tools are typically sufficient; some owners opt to have a technician perform the swap. Inspect mating surfaces and the water intake for debris, and replace the impeller at recommended service intervals to avoid failures away from shore.

• Tools: screwdrivers, socket set, torque wrench, marine-grade sealant as needed
• Inspect housing, intake grill, and drive seals while disassembled
• Follow torque specs and alignment marks; replace any damaged fasteners

Who is this for? This SeaSierra repair kit is aimed at boat owners, owners/operators of Mercruiser Alpha One Gen 2 sterndrives, and marine technicians who prefer to service the pump internals rather than the entire pump assembly. It’s ideal for preventive maintenance on older drives, emergency field repairs, or for anyone restoring cooling performance using OEM-equivalent components backed by SeaSierra’s marine parts experience.