Water Pump Repair Kit for Mercury Mariner 25-50 HP Outboard - 821354A04, 18-4531

Water Pump Repair Kit for Mercury Mariner

This water pump repair kit replaces OEM part numbers 821354A04 and 18-4531 for Mercury Mariner 25-50 HP outboard engines, providing all necessary components to restore cooling system function. A reliable water pump repair kit ensures proper water circulation to prevent overheating in Mercury Mariner outboards.

Overview

The water pump repair kit includes gaskets, seals, and impeller for Mercury Mariner outboards. Designed as a direct replacement, this water pump repair kit maintains the cooling efficiency of Mercury Mariner 25-50 HP engines. Suitable for DIY mechanics and professional technicians alike.

Built For Performance

• Includes high-quality impeller for reliable water flow
• Precision-cut gaskets ensure leak-free sealing
• Corrosion-resistant materials extend service life
• Direct-fit design simplifies installation
• OEM-spec components match original factory tolerances

Fits These Machines

• for Mercury Mariner 25 HP Outboard
• for Mercury Mariner 30 HP Outboard
• for Mercury Mariner 40 HP Outboard
• for Mercury Mariner 50 HP Outboard

On-The-Job Use

• Replacing worn water pump assembly in Mercury Mariner outboards
• Restoring cooling system performance after impeller failure
• Preventing engine overheating during heavy use
• Performing routine water pump maintenance

Specs At A Glance

Good To Know

Q: Does this kit include the impeller? A: Yes, the kit contains a new impeller along with necessary gaskets and seals for a complete repair.

Q: Is this compatible with two-stroke and four-stroke models? A: This water pump repair kit is designed for Mercury Mariner outboards within the 25-50 HP range, covering both two-stroke and four-stroke variants.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.