Marinepro Upper Water Pump Repair Kit 99157T2 for Mercury/Mariner 2-Stroke 15–25 HP & 4-Stroke 8–15 HP

Overview

The Marinepro Upper Water Pump Repair Kit 99157T2 is a trusted, all-in-one replacement set designed for Mercury Mariner outboard cooling systems. Rather than sourcing parts separately, this kit assembles a pump housing, impeller, gasket, face plate, drive key, seal, washers, grommets, and rings into a single, ready-to-install package. It aims to support steady water flow through the lower unit and maintain consistent cooling performance under typical boating use. While results can vary by vessel and operating conditions, this kit provides a practical option for maintenance or overhauls when several OEM references appear across part numbers.

Compatibility at a glance

Engine coverage spans Mercury Mariner two-stroke models in the 15–25 HP range and four-stroke models in the 8–15 HP range, including certain BigFoot variants in regional builds. The assembly is designed to be interchangeable with multiple Mercury part numbers such as 46-99157T2 and related references, enabling a convenient, all-in-one upgrade for compatible engines.

What’s in the box

• Pump Housing Assembly
• Impeller
• Gasket
• Face Plate
• Drive Key
• Seal
• Two Washers
• Four Grommets
• Six Rings

Design and materials

The kit emphasizes compatibility with standard cooling circuits and common mounting patterns. The combination of the housing, impeller, and seals is chosen to support a seal-tight fit and dependable impeller rotation. The assortment of small components (washers, grommets, rings) helps ensure proper alignment and secure assembly during service.

Installation and maintenance ideas

Before installation, inspect the drive housing and mounting surface for wear. Use the included drive key and seal in a careful seating sequence to minimize leaks. After assembly, check water flow and confirm the gasket seats evenly around the housing. Regular checks during boating seasons can help maintain the intended cooling path.

Why choose Marinepro

• Direct replacement options that align with common OEM references
• Broad engine compatibility across two-stroke and four-stroke Mercury Mariner models
• All-in-one kit simplifies maintenance with a single purchase
• Designed to support reliable water flow and sealing in typical outboard cooling setups

More options

Looking for additional water pump service kits? Our store offers a wide range of compatible options to fit your engine configuration.