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Water Pump Impeller Repair Kit for Mercury Mariner 3.5HP - 9.8HP (1975-1986)
Water Pump Impeller Repair Kit for Mercury Mariner 3.5HP - 9.8HP (1975-1986)
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Product Overview
Ensure your vintage outboard stays cool on the water with this Precision Water Pump Impeller Kit. Specifically engineered for Mercury Mariner 2-stroke engines ranging from 3.5HP to 9.8HP, this kit restores essential water pressure to your cooling system. By replacing your worn impeller with this high-grade neoprene component, you prevent engine overheating and maintain reliable performance during every outing.
Product Compatibility
Designed for classic small-displacement Mercury and Mariner 2-stroke outboard engines.
| Engine Type | Horsepower Range | Production Years |
| Mercury Mariner | 3.5HP, 3.6HP, 3.9HP | 1970s - 1980s |
| Mercury Mariner | 4HP, 4.5HP, 6HP | 1975 - 1986 |
| Mercury Mariner | 7.5HP, 9.8HP | 1975 - 1986 |
| OEM Cross-Ref | 47-89980T1, 47-89980Q1 | -- |
Specifications (Impeller Dimensions)
To ensure 100% compatibility, please verify these dimensions against your original part:
| Measurement | Metric | Imperial |
| Overall Diameter | 32.0mm | 1.26" |
| Impeller Height | 14.4mm | 0.57" |
| Hub Shaft Diameter | 11.0mm | 0.438" |
| Blade Count | 6 Blades | -- |
| Material | High-Strength Marine Neoprene | -- |
Key Features
- Durable Neoprene Construction: The impeller is manufactured from a high-quality neoprene rubber compound, providing excellent flexibility and resistance to chemical corrosion and salt-water wear.
- Optimized Cooling Flow: Engineered to provide consistent water volume and pressure, ensuring your engine remains within its optimal operating temperature even at high RPMs.
- Precision Hub Fit: The hub is designed for a secure fit on the driveshaft, preventing slippage and ensuring reliable mechanical energy transfer to the water pump.
- Direct OEM Replacement: Manufactured to strict factory standards, making it a "drop-in" solution that matches the fit and function of original Mercury parts.
- Essential Maintenance Component: Regular replacement of the impeller (typically every season or 100 hours) is the best insurance against catastrophic engine seizure caused by cooling failure.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for Designed for classic small-displacement Mercury and Mariner 2-stroke outboard engines.; Engine Type; Horsepower Range; Production Years; Mercury Mariner; 3.5HP, 3.6HP, 3.9HP; 1970s - 1980s. Listed year information includes 1975–1986, 1975, 1986. It is best matched to original part number(s) 1975-1986, 47-89980T1, 47-89980Q1. Key physical/spec details from the product data include Overall Diameter: 32.0mm, Impeller Height: 14.4mm, Hub Shaft Diameter: 11.0mm. 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, 47-89980T1, 47-89980Q1 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, 47-89980T1, 47-89980Q1, 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, 47-89980T1, 47-89980Q1. Recheck listed specs such as Overall Diameter: 32.0mm, Impeller Height: 14.4mm, Hub Shaft Diameter: 11.0mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
I have a 1978 mercury 9.8 hp outboard that hasn't started or seen water in a few years. I knew it needed an impeller so I ordered this kit. It was a perfect replacement and fit. It works like a charm and my outboard is passn coolant water even at an idle.