PRODUCT DETAILS
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.
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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