Water Pump Impeller Repair Kit for Mercury / Mariner Outboards

High-quality water pump impeller repair kit designed for Mercury and Mariner outboards ranging from 25HP to 50HP. Suitable for both 2-stroke and 4-stroke models across various cylinder configurations. This kit restores proper water flow through the cooling system — essential for preventing engine overheating and extending engine life.

Fits the following Mercury / Mariner outboard models:

Will fit only models with gear housing – drive shaft 2:1 gear ratio. Standard gearbox only. Not compatible with BigFoot models - excelpt 25 hp

4-Stroke Models:
• 25HP BigFoot (1998–2005)
• 30HP 3 Cyl, 3 Carbs
• 40HP 3 Cyl, 3 Carbs
• 50HP 4 Cyl, 4 Carbs (1.83:1 / 2:1 Gear Ratio, non-BigFoot)

2-Stroke Models:
• 30HP 2 Cyl, single carb (1995 and up, excluding engines with serial numbers starting with 0N0...)
• 40HP 2 Cyl, single carb (1995 and up)
• 40HP 3 Cyl, 3 Carbs (1995 and up)
• 50HP 3 Cyl, 3 Carbs (1998 and up, non-BigFoot)

Replaces Mercury Part Numbers:
821354A2, 821354A1, 821354A4

Product Features:
• Marine-grade aftermarket kit
• Includes impeller and essential pump repair components
• Helps restore cooling performance
• Built to OEM specifications
• Direct-fit replacement — easy to install

Please check compatibility before purchasing.
It is the buyer’s responsibility to ensure this part fits your engine.
Not sure? Message us — our SSI Marine team is happy to help!

Why Buy from SSI Marine?
• Quality marine parts at competitive prices
• UK stock — same-day dispatch before 1 PM
• Tracked 24-hour delivery
• Friendly, expert customer service

Order now from SSI Marine — trusted for reliable outboard parts and fast UK shipping.

Water Pump Impeller Repair Kit for Mercury Mariner 25–50HP Outboards