Water Pump Impeller Repair Kit with Housing – Fits Mercury/Mariner 30–70 HP Outboards, Replaces 46-77177A3
Water Pump Impeller Repair Kit with Housing – Fits Mercury/Mariner 30–70 HP Outboards, Replaces 46-77177A3 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Repair Kit with Housing – Fits Mercury/Mariner ...
Water Pump Impeller Repair Kit with Housing – Fits Mercury/Mariner 30–70 HP Outboards, Replaces 46-77177A3 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller Repair Kit with Housing is intended for selected Mercury and Mariner 30–70 HP outboard applications. It replaces the water-pump service assembly associated with Mercury reference 46-77177A3 and is designed to restore water-pump service components that may be worn, scored, hardened, or damaged.
The kit is intended for applications using the listed Mercury/Mariner water-pump arrangement. Because fitment varies by horsepower, model, cylinder configuration, and serial-number range, compare your complete engine details and existing components with the compatibility information before ordering.
- Aftermarket replacement water-pump repair kit.
- Includes an impeller, pump housing, gaskets, O-rings, plates, and related service components as listed below.
- Neoprene rubber impeller for routine cooling-system maintenance.
- Designed around Mercury reference 46-77177A3; verify the application before installation.
Part Number References
The following numbers are cross-referenced in the available product and catalog data. They are reference numbers only; they do not indicate that every number is included in the box.
| Brand or Reference | Part Number |
|---|---|
| Mercury | 46-77177A3 |
| Mercury | 77177A3 |
| Sierra | 18-3324 |
| GLM | 12100 |
| Mallory | 9-48312 |
Engine & Model Compatibility
Use the table below as an application guide. The model, horsepower, stroke, and serial-number conditions must be considered together. If your engine is not listed, or if its serial number falls outside the stated range, confirm fitment before purchase.
| Brand | Model | Rated HP | Stroke | Years | OEM Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | Outboard | 30 | 2-Stroke | 1977–1989 | 46-77177A3 | Serial 1271884–1448139 |
| Mercury | 30 Jet | 30 | 2-Stroke | Not specified | 46-77177A3 | Serial C159200–G589999 or 9570790 and up, depending on catalog application |
| Mercury/Mariner | Outboard | 35 | 2-Stroke | 1984–1989 | 46-77177A3 | 2-cylinder; serial 6445653 and up |
| Mercury/Mariner | Outboard | 40 | 2-Stroke | 1978–1979 | 46-77177A3 | 2-cylinder; serial 4860103–5556229 |
| Mercury/Mariner | Outboard | 40 | 2-Stroke | 1980–1983 | 46-77177A3 | 2-cylinder; serial 5556230–6445653 |
| Mercury/Mariner | Outboard | 40 | 2-Stroke | 1989 and up | 46-77177A3 | 4-cylinder; serial 0C159200 and up |
| Mercury/Mariner | Outboard | 45 | 2-Stroke | 1986 and up | 46-77177A3 | 4-cylinder; serial 5531630 and up |
| Mercury/Mariner | Outboard | 50 | 2-Stroke | 1978–1985 | 46-77177A3 | 4-cylinder; serial 4962056 and up |
| Mercury/Mariner | Outboard | 50 | 2-Stroke | 1984–1990 | 46-77177A3 | 3-cylinder; serial 6428681–0D000749 |
| Mercury/Mariner | Outboard | 60 | 2-Stroke | 1984–1990 | 46-77177A3 | 3-cylinder; serial 6428681–0D000749 |
| Mercury/Mariner | Outboard | 65 | 2-Stroke | 1976 | 46-77177A3 | 3-cylinder; serial 4382057–4571651 |
| Mercury/Mariner | Outboard | 70 | 2-Stroke | 1979–1983 | 46-77177A3 | 3-cylinder; serial 4977157–6428680 |
Technical Specifications
- Product Type
- Water pump impeller repair kit with housing
- Application
- Selected Mercury and Mariner 30–70 HP outboard water-pump systems
- Impeller Material
- Neoprene rubber compound
- Product Status
- Aftermarket replacement; not a Mercury OEM-branded component
- Fitment Method
- Match the engine model, horsepower, stroke, cylinder configuration, and serial-number range before installation
What’s in the Box
Package contents for this listing are shown below. Part-number references identify the corresponding service components where available.
- 1 × Water pump impeller
- 1 × Upper pump housing
- 1 × Water pump base
- 2 × Plates
- 2 × Drain gaskets
- 1 × Drain plug
- 3 × Water pump base gaskets
- 3 × O-rings
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Remove the lower unit according to the engine manufacturer’s service procedure.
- Disassemble the water-pump assembly and remove the old impeller, housing, plates, and gaskets.
- Clean all mating surfaces and remove old gasket material, corrosion, and debris.
- Install the new gaskets, plates, impeller, and related components in the correct order for your engine.
- Orient the impeller vanes correctly; follow the engine service manual for driveshaft rotation and installation direction.
- Install the housing and tighten fasteners to the manufacturer’s specified torque.
- Reinstall the lower unit, ensuring that the driveshaft, shift shaft, and water tube are correctly aligned.
- Run the engine only with an adequate water supply and confirm a steady tell-tale stream before normal operation.
Troubleshooting & FAQ
How can I confirm fitment?
Check the engine brand, exact model, horsepower, stroke, cylinder configuration, and serial number against the compatibility table. Compare the original pump components with the listing information before ordering.
What are common signs of a failing impeller?
Overheating at idle or low speed, a weak or missing tell-tale stream, damaged vanes, cracking, hardening, or pieces of rubber found in the cooling system can indicate that the impeller requires inspection or replacement.
How often should the impeller be replaced?
Inspect the impeller regularly and follow the maintenance schedule for your engine. Replacement intervals may need to be shortened when operating in saltwater, sandy water, or silty conditions.
Why replace the housing with the impeller?
A worn, scored, warped, or heat-damaged housing can reduce pump performance even when a new impeller is installed. Replacing the housing as part of the repair helps restore the intended pump assembly condition.
Is this an OEM part?
No. This is an aftermarket replacement kit referenced to Mercury part number 46-77177A3. Mercury, Mariner, Sierra, GLM, and Mallory names and numbers are used only to identify applications and reference parts.
Safety & Important Information
- Do not rely on horsepower alone for fitment; serial-number and model conditions are important.
- Verify the original part, component layout, and package contents before installation.
- Never run an outboard without an adequate water supply.
- Use the manufacturer’s service manual for disassembly procedures, torque values, sealant requirements, and final testing.
- Professional installation is recommended when lower-unit removal or water-pump service is unfamiliar.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine boat and outboard maintenance.
- Application-Focused Listings — Product references are organized around engine model and part-number information.
- Value-Oriented Service — Replacement solutions for maintaining dependable marine equipment.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
