Water Pump Repair Kit for Mercury 3.3 HP 2-Stroke and Tohatsu MFS2–MFS3.5 4-Stroke Outboards – Replaces 16159A2, 8M0080264 and 3AB-87322-0
Water Pump Repair Kit for Mercury 3.3 HP 2-Stroke and Tohatsu MFS2–MFS3.5 4-Stroke Outboards – Replaces 16159A2, 8M0080264 and 3AB-87322-0 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Repair Kit for Mercury 3.3 HP 2-Stroke and Tohatsu MFS2–...
Water Pump Repair Kit for Mercury 3.3 HP 2-Stroke and Tohatsu MFS2–MFS3.5 4-Stroke Outboards – Replaces 16159A2, 8M0080264 and 3AB-87322-0 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit is an aftermarket replacement for selected small Mercury and Tohatsu outboard water-pump assemblies. Catalog references identify the Mercury application around 3.3 HP 2-stroke outboards, including shiftable engines, and the Tohatsu application for MFS2, MFS2.5 and MFS3.5B/C 4-stroke models. Always match the complete OEM part number and engine serial or model information before ordering.
The kit is intended to replace water-pump service components associated with Mercury references 16159A2, 8M0080264 and 889246A16, together with Tohatsu reference 3AB-87322-0. The listed numbers are manufacturer or OEM reference numbers only; this product is not an OEM-branded part.
- Replacement water-pump service kit for selected small outboards.
- Designed for servicing the impeller, wear surfaces and associated gaskets in the applicable pump assembly.
- Includes a six-blade impeller with a nylon hub.
- Confirm the reference number, engine model, stroke, year and serial range before installation.
Part Number Matrix
Use the following references to compare the required water-pump repair kit with your original part or service-manual listing.
| Brand | Manufacturer or OEM Reference |
|---|---|
| Mercury / Mercury Mariner | 16159A2 |
| Mercury / Mercury Mariner | 47-16159A2 |
| Mercury / Mercury Mariner | 8M0080264 |
| Mercury / Mercury Mariner | 47-8M0080264 |
| Mercury / Mercury Mariner | 889246A16 |
| Mercury / Mercury Mariner | 47-889246A16 |
| Tohatsu | 3AB-87322-0 |
| Tohatsu | 3AB873220M |
| Tohatsu | 3F0-87322-1 |
| Tohatsu | 3F0873221M |
Engine and Model Compatibility
Fitment depends on the complete engine configuration. Model, horsepower, stroke and serial conditions must be checked together; a matching horsepower alone does not confirm compatibility.
| Brand | Model or Application | Rated HP | Stroke | Year or Serial Condition | Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | 3.3 HP outboard | 3.3 HP | 2-Stroke | 0D901217 through 0G710612 | 8M0080264 | Catalog occurrence identifies shiftable engines. |
| Mercury | 3.3 HP outboard | 3.3 HP | 2-Stroke | 0G710613 through 0T894576 | 8M0080264 | Verify the exact serial number and pump configuration. |
| Mercury | 3.3 HP outboard | 3.3 HP | 2-Stroke | 0T894577 and up | 8M0080264 | Verify the exact serial number and pump configuration. |
| Tohatsu | MFS2 / MFS2.5 / MFS3.5B | 2–3.5 HP | 4-Stroke | 2016–2019 catalog applications | 3AB-87322-0 | Check the model suffix and service-manual listing. |
| Tohatsu | MFS2 / MFS2.5 / MFS3.5C | 2–3.5 HP | 4-Stroke | 2019–2026 catalog applications | 3AB-87322-0 | Check the model suffix and service-manual listing. |
Important: The catalog references above are application leads, not a substitute for checking the original part. Mercury and Tohatsu/Nissan model naming, serial breaks and pump designs can vary by production year and market.
Technical Specifications
- Product Type
- Water pump repair kit
- Application
- Selected Mercury and Tohatsu small outboard water-pump assemblies
- Installation
- Direct replacement service components; professional installation is recommended
- Impeller Material
- Marine-grade CR neoprene
- Wear Plate and Liner Material
- SS316 stainless steel
- Impeller Dimensions
- Height: 14.35 mm (0.56 in); overall diameter: 33.6 mm (1.32 in); hub shaft diameter: 10.4 mm (0.41 in)
- Weight
- 57 g (2.01 oz)
- Impeller Design
- Six-blade impeller with nylon hub
What's in the Box
- 1 x Water pump impeller (47-161543)
- 1 x Impeller pin (28-16155)
- 1 x Housing gasket (27-898101331)
- 1 x Wear plate gasket (27-898101332)
- 1 x Wear plate (898101371)
- 1 x Insert cup (161571)
Part numbers in the package list are component or reference numbers and may differ from the package's primary application number. Compare the components with the parts removed from your engine before installation.
Installation Notes
- Make sure the engine is stopped, cool and secured. Disconnect the battery where applicable and follow the engine manufacturer's safety instructions.
- Remove the gearcase or lower unit according to the applicable service manual.
- Remove the water-pump housing and note the original impeller-vane direction and component order.
- Remove the old impeller, pin or key, wear plate and gaskets. Clean the mating surfaces without damaging the housing or driveshaft.
- Install the replacement wear plate and gaskets in the same orientation as the original components.
- Fit the new impeller onto the driveshaft, align the key or pin, and rotate the driveshaft in its normal operating direction while lowering the housing so the vanes seat correctly.
- Fasten the pump housing using the manufacturer's specified hardware and torque procedure.
- Reinstall the lower unit, ensuring correct alignment of the driveshaft, shift shaft and water tube where applicable.
- Run the engine only in water or with an appropriate flushing attachment. Confirm cooling-water flow and check for leaks before normal operation.
Troubleshooting and FAQ
How can I confirm that this kit fits my outboard?
Compare the complete OEM reference, engine brand, model, horsepower, stroke and serial or year condition. For Mercury applications, the catalog references center on selected 3.3 HP 2-stroke engines. For Tohatsu applications, reference 3AB-87322-0 is associated with selected MFS2, MFS2.5 and MFS3.5B/C 4-stroke models. If any detail differs, confirm the required kit with the engine service manual or a qualified marine dealer.
What are common signs of a worn water-pump impeller?
Possible signs include weak or intermittent tell-tale flow, overheating at idle or low speed, reduced cooling-water output, or an impeller that is cracked, brittle, deformed or missing vane material during inspection.
How often should the impeller be replaced?
Inspect the water-pump impeller according to the engine manufacturer's maintenance schedule. Service intervals depend on operating hours, storage conditions and whether the engine is used in saltwater, sand or silty water. Replace it sooner if damage or overheating symptoms are present.
Can I use this kit if my serial number is outside the listed range?
Do not assume fitment from horsepower alone. Serial-number changes can correspond to different gearcase or water-pump components. Check the complete original part number and the applicable service-manual diagram before ordering.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to interchange with the manufacturer references listed on this page. Mercury, Mariner and Tohatsu reference numbers are used only for identification and compatibility comparison.
What are the shipping options?
Available shipping methods and delivery estimates are shown at checkout and may vary by destination, carrier and inventory location.
What is the warranty and return policy?
Warranty coverage and returns are governed by the seller's current policy. Contact customer support before returning a product and keep the order information and original packaging available.
Safety and Important Information
- Verify the original part, engine model, stroke, year and serial range before purchase.
- Do not operate an outboard without an adequate cooling-water supply.
- Stop operation immediately if the engine overheats or cooling-water flow is weak or absent.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for selected outboard service applications.
- Fitment-Focused Information — Reference numbers and application details are provided to support careful part comparison.
- Global Fulfillment — Shipping availability and delivery estimates are presented at checkout for the destination entered.
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