18-2628 Seal Kit for Mercury Mariner Force 3.9-9.8 HP | SeaSierra
18-2628 Seal Kit for Mercury Mariner Force 3.9-9.8 HP | SeaSierra is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Product Details
- SKU: 182628
- Brand & Manufacturer: SeaSierra
- Category: Gearcase Seal Kit
- Part Type: Seal Kit for Outboard Lower Units
Compatibility
This gearcase seal kit is compatible with the following Mercury, Mariner, and Force outboard lower units:
- 3.9-9.8 HP: 1975-1986
Part Numbers and Replacements
- Replaces OEM Part Numbers: 26-77066A1
-
Interchangeable with:
- GLM 87574
- Mallory 9-74212
- Mercury Marine 26-77066A1
Kit Components
The package includes the following items:
- Sierra 18-0584 Oil Seal
- Sierra 18-2010 Oil Seal
- Sierra 18-2945 Drain Screw Gasket
- Sierra 18-4261 Washer
- Sierra 18-7116 O-Ring
- Sierra 18-7120 O-Ring
- Sierra 18-7156 O-Ring
- Sierra 18-7168 O-Ring
- Sierra 18-7171 O-Ring
- Sierra 18-7180 O-Ring
- Sierra 18-8308 Shift Shaft Oil Seal
- Sierra 18-8310 Water Pump Base Seal
- Sierra 18-0516 Oil Seal
- Three additional Seals
- One Bushing
Additional Information
- The product is designed specifically for Mercury engines.
- Each Sea Sierra product meets or exceeds the original equipment part it replaces.
- Ensure to check part numbers for proper fit.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

