AUTOBABA Water Pump Repair Kit for Mercury MerCruiser Alpha 1 Gen 2 (1991–2021) – Impeller, Seals & Housing

AUTOBABA's Water Pump Repair Kit is a complete replacement set engineered to restore cooling performance on 1991–2021 Mercury MerCruiser Alpha 1 Gen 2 drives.

If your outboard or sterndrive is running hot or showing reduced coolant flow, the cause is often a worn impeller or leaking seals. This kit contains the wear plate, seal carrier, impeller, gaskets, seals and housing needed to rebuild the water pump assembly and is designed to match the fit and function of OEM part numbers 18-3147, 47-43026-1, 47-43026-2, 817275T4 and 817275Q05.

How does this kit restore cooling on my MerCruiser Alpha 1 Gen 2?

The kit replaces the pump components that move water through your engine’s cooling passages. A new impeller and intact seals re-establish proper flow and prevent air leaks that reduce pump efficiency.

• Includes molded impeller matched to OEM dimensions for efficient water displacement.
• New gaskets and seals eliminate intake and outlet leaks.
• Wear plate and housing restore tight clearances for consistent flow.

Is this an exact fit for my 1991–2021 Mercury MerCruiser Alpha 1 Gen 2 drive?

Yes—this kit is built for Alpha 1 Gen 2 drives across the 200HP, 225HP and 250HP ranges and follows the original equipment specifications. It is compatible with the listed OE numbers so installation uses the factory mounting points and pump orientation.

• Works with 1991–2021 Alpha 1 Gen 2 (200/225/250HP) models.
• Cross-referenced to OE numbers for straightforward part matching.
• Designed to install with factory hardware and torque patterns.

What components come in the box and what should I expect during installation?

The package includes the impeller, wear plate, seal carrier, gaskets, seals and the pump housing—everything required for a standard water pump rebuild. Installation is a routine mechanical repair if you have basic tools and follow torque and alignment steps in the service manual.

• Complete component set—no need to source additional seals.
• Follow Mercury service instructions for shaft alignment and priming.
• Replace sacrificial hardware if corroded and inspect cooling passages for debris.

How reliable is AUTOBABA’s replacement compared with OEM parts?

AUTOBABA manufactures this kit to meet or exceed the original part specifications for flow and fit, focusing on consistent performance and durable materials. The set is tested for correct clearances and seal integrity to protect the engine from overheating risks related to pump failure.

• Materials chosen for resistance to wear and saltwater exposure.
• Designed to restore specified cooling flow rates comparable to OEM.
• Backed by AUTOBABA’s one-year unlimited-mileage support policy.

Who is this for: Boat owners, marine technicians and DIY mechanics who operate Mercury MerCruiser Alpha 1 Gen 2 sterndrives (200–250HP) and need a complete, OEM-compatible water pump rebuild kit. It’s suited for routine preventative maintenance or emergency replacement when impellers, seals or housings show wear. If you require verified OE cross-references (18-3147, 47-43026-1, 47-43026-2, 817275T4, 817275Q05) and a hassle-free parts package to restore engine cooling, this kit provides the necessary components and manufacturer support to get your drive back to proper operation.