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Water Pump Impeller Repair Kit for Mercury Mariner & Force 4HP - 9.8HP
Water Pump Impeller Repair Kit for Mercury Mariner & Force 4HP - 9.8HP
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Product Overview
Maintain peak cooling efficiency for your marine engine with this Premium Water Pump Impeller Rebuild Kit. Specifically designed for Mercury, Mariner, and Force 2-stroke outboard motors (1975-1986), this kit is a critical maintenance component for ensuring consistent water flow to your engine block. By replacing your worn-out impeller, you can prevent engine overheating and ensure a smooth, reliable experience on the water.
Product Compatibility
Optimized for classic small-displacement 2-stroke outboard engines.
| Engine Brands | Horsepower Range | Compatibility Details |
| Mercury / Mariner | 4HP, 4.5HP, 7.5HP, 9.8HP | 2-Stroke Models (Approx. 1975-1986) |
| Force | 4HP, 4.5HP, 7.5HP, 9.8HP | Compatible 2-Stroke Outboards |
| OEM Cross-Ref | 47-89981Q1, 47-89981T1 | -- |
| Sierra Part | 18-3039 | -- |
Specifications
To ensure a perfect fit, please verify your drive shaft diameter against the specs below:
| Feature | Measurement |
| Drive Shaft Diameter | 0.456" (Inner Hub Size) |
| Impeller Material | High-Performance Marine Neoprene |
| Blade Count | 6-Blade Design |
| Function | Restoration of Cooling Water Volume and Pressure |
Key Features
- High-Grade Neoprene Impeller: Engineered for maximum durability and flexibility, this impeller resists chemical corrosion, salt-water abrasion, and high-speed mechanical stress.
- Precise Drive Shaft Fit: Specifically machined for a 0.456" drive shaft, ensuring a secure grip and efficient mechanical power transfer to the water pump.
- Essential Overheating Protection: By restoring the correct water pressure, this kit protects your engine’s internal components from thermal damage and potential seizure.
- Full Maintenance Solution: Manufactured to meet or exceed OEM specifications, providing the same fit and performance as original factory parts at a better value.
- Quality Assured: Each component is inspected for structural integrity and material quality to ensure long-term operation in harsh marine environments.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for Optimized for classic small-displacement 2-stroke outboard engines.; Engine Brands; Horsepower Range. Listed year information includes 1975–1986, 1975, 1986. It is best matched to original part number(s) 1975-1986, 47-89981Q1, 47-89981T1, 18-3039. Key physical/spec details from the product data include Drive Shaft Diameter: 0.456" (Inner Hub Size), 0.456" (Inner Hub Size), 4HP. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 1975-1986, 47-89981Q1, 47-89981T1, 18-3039 before purchase. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. This is especially important for Mercury models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. If your original part number does not cross-reference with 1975-1986, 47-89981Q1, 47-89981T1, 18-3039, treat the fitment as unconfirmed. Model years outside 1975–1986, 1975, 1986 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Confirm OEM/cross-reference number(s): 1975-1986, 47-89981Q1, 47-89981T1, 18-3039. Recheck listed specs such as Drive Shaft Diameter: 0.456" (Inner Hub Size), 0.456" (Inner Hub Size), 4HP. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.