Water Pump Impeller for Mercury/Mariner 2–6 HP Outboards – Replaces Mercury 47-16154, 47-16154-3 and Sierra 18-3098
Water Pump Impeller for Mercury/Mariner 2–6 HP Outboards – Replaces Mercury 47-16154, 47-16154-3 and Sierra 18-3098 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller for Mercury/Mariner 2–6 HP Outboards – Replaces...
Water Pump Impeller for Mercury/Mariner 2–6 HP Outboards – Replaces Mercury 47-16154, 47-16154-3 and Sierra 18-3098 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed as a replacement for selected Mercury and Mariner small outboard engines from 2 to 6 HP. The listed applications include Mercury/Mariner 2-stroke models from 1987–2006 and 4-stroke models from 1999–2006. Confirm the exact engine model, stroke, year and serial-number range before ordering.
This impeller is listed as a replacement for Mercury part numbers 47-16154 and 47-16154-3, and Sierra part number 18-3098. These references identify replacement relationships; they do not mean the part is manufactured by Mercury or Sierra.
- Designed for direct installation on the water-pump drive shaft when the listed application and dimensions match.
- Molded neoprene impeller material helps maintain water flow through the cooling system.
- Package includes one impeller and one mounting pin/drive key.
Part Number Matrix
Use the following references together with your engine model and serial number to confirm compatibility.
| Brand | Part Number |
|---|---|
| Mercury | 47-16154 |
| Mercury | 47-16154-3 |
| Sierra | 18-3098 |
Engine & Model Compatibility
The application information below must be checked as a complete combination of brand, model or serial range, horsepower, stroke and year. Do not rely on horsepower alone.
Mercury/Mariner 2-Stroke Outboards
| Brand | Model or Serial Range | Rated HP | Stroke | Years | Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | 0T884302 and up | 2 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0G710613 and up | 3 | 2-Stroke | 1993–2006 | 47-16154 | |
| Mercury | 0G710613–0T894438 | 4 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0T894439 and up | 4 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0P017000–0P400999 | 4 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0P401000 and up | 4 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0G710613–0T894438 | 5 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0T894439 and up | 5 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0P017000–0P400999 | 5 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mercury | 0P401000 and up | 5 | 2-Stroke | 1987–2006 | 47-16154 | |
| Mariner | 3.3 HP with shift | 3.3 | 2-Stroke | 1993–2006 | 47-16154 | Serial 0D901217 and up |
| Mariner | 1-cylinder models | 4 | 2-Stroke | 1987–2006 | 47-16154 | Serial 0A809601 and up |
| Mariner | 1-cylinder models | 5 | 2-Stroke | 1987–2006 | 47-16154 | Serial 0A809601 and up |
Mercury/Mariner 4-Stroke Outboards
| Brand | Model or Serial Range | Rated HP | Stroke | Years | Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | Carbureted, 0R131842 and up | 2 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mercury | Carbureted, 0R131842 and up | 2.5 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mercury | Carbureted, 0R131842 and up | 3.5 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mercury | 0P073456 and up | 4 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mercury | 0P073456 and up | 5 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mercury | 0P073456 and up | 6 | 4-Stroke | 1999–2006 | 47-16154 | |
| Mariner | Model not specified | 2.5 | 4-Stroke | 1999–2006 | 47-16154 | Serial 0R411838 and up |
| Mariner | Model not specified | 3.5 | 4-Stroke | 1999–2006 | 47-16154 | Serial 0R411838 and up |
| Mariner | Model not specified | 4 | 4-Stroke | 1999–2006 | 47-16154 | Serial 0R411838 and up |
| Mariner | Model not specified | 5 | 4-Stroke | 1999–2006 | 47-161838 and up | Serial 0R411838 and up |
| Mariner | Model not specified | 6 | 4-Stroke | 1999–2006 | 47-16154 | Serial 0R411838 and up |
Technical Specs
- Product Type
- Water pump impeller
- Application
- Selected Mercury and Mariner 2–6 HP outboards
- Installation
- Direct drive-shaft installation when application and dimensions match
- Material
- Neoprene rubber
- Color
- Black
- Overall Diameter
- 33.8 mm (1.33 in)
- Internal Shaft Diameter
- 10.4 mm (0.41 in)
- Height
- 14.2 mm (0.56 in)
- Weight
- 7.9 g (0.28 oz)
- Drive Connection
- Shaft-mounted with included pin/drive key
What’s in the Box
- 1 × Water pump impeller
- 1 × Mounting pin/drive key
Installation Notes
- Disconnect the spark-plug leads and battery, where fitted, to prevent accidental starting.
- Place the outboard gear selector in neutral.
- Remove the lower unit or gearcase according to the engine service manual.
- Remove the water-pump housing to access the old impeller.
- Record the old vane orientation and remove the impeller and drive pin/key.
- Clean the pump housing and wear plate. Replace worn or damaged pump components before installation.
- Install the included drive pin/key in the shaft groove.
- Fit the new impeller over the shaft and rotate it in the correct direction to pre-bend the vanes.
- Apply a light film of clean water or suitable marine assembly lubricant to the impeller and housing. Do not run a dry impeller.
- Reinstall the water-pump housing and tighten fasteners to the manufacturer’s specification.
- Reattach the lower unit and test the cooling-water flow in a safe water supply before normal operation.
Troubleshooting & FAQ
How do I confirm whether this impeller fits my engine?
Compare the complete engine model, serial number, horsepower, stroke and year with the compatibility tables. Also compare the old impeller’s dimensions and drive-pin arrangement. If any detail differs, consult the engine service manual or a qualified marine technician before ordering.
What are the signs of a failing water-pump impeller?
Common signs include overheating at idle or low speed, a weak or missing telltale stream, reduced cooling-water flow, and cracked, stiff or damaged rubber vanes when the impeller is inspected.
How often should the impeller be replaced?
Inspect the impeller during routine service and replace it when the vanes are damaged, permanently set, cracked or hardened. Replacement intervals depend on engine use and water conditions, especially salt, sand and silt exposure.
Is the included pin necessary?
Yes. The pin acts as the drive key that locks the impeller to the shaft. Install the impeller with the correct pin in place and do not operate the water pump without it.
Is this an OEM part?
No. This is an aftermarket replacement impeller. Mercury, Mariner and Sierra are referenced only to identify compatible engines and replacement part numbers; this product is not manufactured or branded by those companies.
What should I do if the new impeller does not fit?
Do not force the impeller onto the shaft or into the housing. Recheck the engine serial range, original part number, shaft diameter, overall dimensions and drive-pin arrangement before installation.
Safety & Important Information
- Verify the complete application and physical dimensions before purchase.
- Disconnect the starting system before servicing the lower unit.
- Never operate the engine without an adequate water supply to the cooling system.
- Inspect the pump housing, wear plate, seals and related components while replacing the impeller.
- Professional installation is recommended when lower-unit service is unfamiliar.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine service and repair.
- Application-Focused Listings — Compatibility references are provided to help match the part to the correct engine.
- Support for Installation — Check the engine service manual for model-specific removal, installation and torque procedures.
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