Water Pump Impeller Kit with Housing for Mercury/Mariner 2-Stroke 30–70 HP – Replaces Mercury 46-77177A3 and Sierra 18-3324
Water Pump Impeller Kit with Housing for Mercury/Mariner 2-Stroke 30–70 HP – Replaces Mercury 46-77177A3 and Sierra 18-3324 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit with Housing for Mercury/Mariner 2-Stroke 3...
Water Pump Impeller Kit with Housing for Mercury/Mariner 2-Stroke 30–70 HP – Replaces Mercury 46-77177A3 and Sierra 18-3324 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller kit with housing is an aftermarket service replacement for selected Mercury and Mariner 2-stroke outboard engines rated from 30 to 70 HP. The listed applications cover model years and serial-number ranges shown in the compatibility table below. Always compare your engine model, year, serial number, and original water-pump components before ordering.
The kit is listed as a replacement for Mercury OEM reference 46-77177A3 and corresponding aftermarket references including Quicksilver 77177A3, Sierra 18-3324, GLM 12100, and Mallory 9-48312. These references should be used together with the application information, not as a substitute for verifying the complete engine fitment.
- Product type: Water pump repair kit with housing.
- Service purpose: Replaces worn water-pump components to help restore cooling-water circulation.
- Included core components: Impeller, pump plate, key, housing, base, gaskets, washer, and O-ring as listed in the package contents.
- Application: Selected Mercury/Mariner 2-stroke outboards from 30–70 HP.
- Construction: Neoprene rubber impeller with stainless-steel and plastic or metal pump components, depending on the component.
Part Number Matrix
Use the following references to compare your original part and aftermarket catalog information. Confirm application details before installation.
| Brand | Part Number |
|---|---|
| Mercury | 46-77177A3 |
| Quicksilver | 77177A3 |
| Sierra | 18-3324 |
| GLM | 12100 |
| Mallory | 9-48312 |
Engine & Model Compatibility
The applications below reflect the supplied application data. Because Mercury and Mariner fitment can vary by model designation, production year, cylinder configuration, market, and serial-number range, verify all conditions against the identification plate and the original pump assembly.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | JET | 30 | 2-Stroke | 1989–1997 | 46-77177A3 | USA serial range 0C159200–0G589999 |
| Mercury/Mariner | — | 35 | 2-Stroke | 1984–1989 | 46-77177A3 | 2-cylinder application |
| Mercury/Mariner | — | 40 | 2-Stroke | 1978–1983 | 46-77177A3 | USA 4860103 through model year 1983; AUS 8052125 and above; BEL 9184451 through model year 1983; CAN 7112423 and above |
| Mercury/Mariner | — | 40 | 2-Stroke | 1989 and later | 46-77177A3 | 4-cylinder application |
| Mercury/Mariner | — | 45 | 2-Stroke | 1986 and later | 46-77177A3 | 4-cylinder application |
| Mercury/Mariner | — | 50 | 2-Stroke | 1978–1985 | 46-77177A3 | 4-cylinder; USA 5531630 and above; AUS 8063985 and above; BEL 9248006 and above; CAN 7143688 and above |
| Mercury/Mariner | — | 50 | 2-Stroke | 1984–1990 | 46-77177A3 | 3-cylinder; USA 6428681–0D000749; BEL 9385911–9683054; CAN 7208333 and above |
| Mercury/Mariner | — | 60 | 2-Stroke | 1984–1990 | 46-77177A3 | 3-cylinder; USA 6428681–0D000749; BEL 9385911–9683054; CAN 7208333 and above |
| Mercury/Mariner | — | 65 | 2-Stroke | 1976 | 46-77177A3 | 3-cylinder application |
| Mercury/Mariner | — | 70 | 2-Stroke | 1977–1983 | 46-77177A3 | 3-cylinder; USA 4977157–6428680; AUS 8050200 and above; BEL 9196961–9385910; CAN 7110998–7208332 |
| Mercury | Mariner Magnum | 40 | 2-Stroke | Up to 1996 | 46-77177A3 | Verify the engine serial number and original pump configuration |
Technical Specs
- Product Type
- Water pump impeller repair kit with housing
- Installation
- Replacement service part; installation requires removal of the lower unit
- Impeller Material
- Neoprene rubber
- Other Materials
- Stainless steel, plastic, and metal components as applicable to the included parts
- Dimensions
- Approximately 108 × 108 × 51 mm (4.25 × 4.25 × 2.0 in)
- Weight
- Approximately 0.34 kg (0.75 lb)
- Warranty
- Warranty terms, if applicable, are governed by the seller’s current policy
What’s in the Box
The package is supplied as a water-pump service kit. Component appearance may vary slightly by production batch or application. Confirm the contents against the product images and your original assembly before installation.
- 1 × Water pump impeller
- 1 × Impeller plate or wear plate
- 1 × Impeller key
- 1 × Water pump housing
- 1 × Water pump base
- 1 × Water pump base gasket
- 1 × Lower gasket
- 1 × Upper gasket
- 1 × Drain-screw gasket
- 1 × Rubber washer
- 1 × O-ring
- Water-tube coupling where included for the applicable kit configuration
Installation Notes
- Disconnect the battery and uncouple the shift linkage according to the engine service procedure.
- Remove the lower-unit mounting bolts and carefully lower the gearcase from the outboard.
- Remove the old water-pump assembly from the top of the lower unit. Note the orientation and order of every component.
- Clean the driveshaft, water-pump surfaces, and mating areas before installing the replacement parts.
- Install the gasket and pump plate, fit the impeller key, and slide the new impeller onto the driveshaft. Rotate the driveshaft in the specified direction while seating the impeller vanes.
- Lightly lubricate the inside of the replacement housing with a lubricant suitable for water-pump installation, then install the housing over the impeller.
- Secure the housing and related components using the engine manufacturer’s specified tightening sequence and torque values.
- Reinstall the lower unit while aligning the driveshaft, shift shaft, and water tube. Reconnect the shift linkage and any other removed components.
- Run the engine only with an appropriate flush-muff device or in the water. Confirm a strong telltale stream and normal cooling performance before regular operation.
Troubleshooting & FAQ
How do I know if this kit fits my specific engine?
Compare your engine brand, model, horsepower, 2-stroke configuration, year, serial-number range, and original water-pump part number with the compatibility information on this page. If any of these details differ, compare the original pump assembly and consult the engine service information 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 a burnt-rubber smell. A removed impeller may have cracked, brittle, distorted, or missing vanes.
How often should the impeller be serviced?
Inspect and replace the impeller according to the engine manufacturer’s maintenance schedule. Service may be needed sooner when the engine is used in saltwater, muddy water, sandy conditions, or after a period of dry running.
Is the housing included?
Yes. This listing is for a water-pump impeller kit with housing. The package also includes the pump base, plate, key, gaskets, washer, and O-ring listed in the package-contents section. The water-tube coupling may depend on the applicable kit configuration.
My old part is stamped 46-77177A3. Is this the right kit?
46-77177A3 is one of the listed replacement references for this kit, but the engine model, year, serial number, stroke, and pump configuration must also match the application information before purchase.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the listed Mercury and Mariner applications. It is not manufactured by Mercury or Quicksilver.
What are the shipping and return terms?
Shipping availability, delivery estimates, and return eligibility are determined by the seller’s current checkout and store policies. Review the applicable policy before placing an order.
Safety & Important Information
- Verify the engine model, year, serial number, stroke, and original pump configuration before ordering.
- Do not operate the outboard without an adequate water supply. Use a flush-muff device correctly or run the engine in the water.
- Follow the engine manufacturer’s service procedure and torque specifications.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are not experienced with lower-unit removal and water-pump service.
About Sea Sierra
- Marine replacement parts: Parts are selected for common service and repair applications.
- Application-focused listings: Use the supplied model, horsepower, year, stroke, and serial information to help verify compatibility.
- Support: Contact the seller with your engine identification details if you need help checking the application.
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