Water Pump Impeller Repair Kit – Fits Mercury/Mariner 3.9–9.8 HP 2-Stroke Outboards (Replaces 46-92970A5, 47-89980T1)
Water Pump Impeller Repair Kit – Fits Mercury/Mariner 3.9–9.8 HP 2-Stroke Outboards (Replaces 46-92970A5, 47-89980T1) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit – Fits Mercury/Mariner 3.9–9.8 HP 2-...
Water Pump Impeller Repair Kit – Fits Mercury/Mariner 3.9–9.8 HP 2-Stroke Outboards (Replaces 46-92970A5, 47-89980T1) is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller repair kit is designed for selected Mercury and Mariner 2-stroke outboard engines rated at 3.9, 4, 4.5, 6, 7.5, and 9.8 HP. The listed applications cover model years from 1975 through 1986, subject to the model, market, and engine serial-number conditions shown below.
The kit replaces or cross-references Mercury part numbers 46-92970A5, 47-89980T1, and 47-89980Q1. It is intended for water-pump assemblies using a 0.438-inch (11.13 mm) impeller insert. Always compare the original water-pump assembly, impeller insert, and engine serial number before ordering.
- Installs in the lower-unit gearcase to restore water-pump and engine-cooling performance.
- Includes a water-pump housing, cover assembly, face plate, impeller, cup insert, key, seals, O-rings, rubber ring, and washer.
- Uses a marine-grade nylon PA66 housing and stainless-steel SS316 wear-plate and liner components as listed for this kit.
- The 0.438-inch impeller insert size is a critical fitment dimension.
Part Number Matrix
Use these references to compare the replacement kit with the part number marked on the original water-pump assembly. Part-number references do not replace verification of engine model, year, market, serial number, and impeller dimensions.
| Brand | Part Number |
|---|---|
| Mercury | 46-92970A5 |
| Mercury | 47-89980T1 |
| Mercury | 47-89980Q1 |
| QuickMarine | 92970A5 |
Engine & Model Compatibility
The following applications are listed for Mercury and Mariner 2-stroke outboards. Confirm the complete engine model and serial number before installation, because production-market and serial-number changes can affect water-pump fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | Outboard | 3.9 | 2-Stroke | 1975–1986 | 46-92970A5 | Verify the 0.438-inch impeller insert size. |
| Mercury/Mariner | Outboard | 4 | 2-Stroke | 1982–1985 (USA) | 46-92970A5 | Serial range: 5595532–0A809600. |
| Mercury/Mariner | Outboard | 4 | 2-Stroke | 1982–1986 (BEL) | 46-92970A5 | Serial range: 9258281–9477829. |
| Mercury/Mariner | Outboard | 4 | 2-Stroke | 1982–1986 (CAN) | 46-92970A5 | Serial 7143688 and later. |
| Mercury/Mariner | Outboard | 4 | 2-Stroke | 1982–1986 (AUS) | 46-92970A5 | Serial 8068065 and later. |
| Mercury/Mariner | Outboard | 4.5 | 2-Stroke | 1980–1985 (USA) | 46-92970A5 | Serial 5595532 and later. |
| Mercury/Mariner | Outboard | 4.5 | 2-Stroke | 1980–1985 (BEL) | 46-92970A5 | Serial 9258281 and later. |
| Mercury/Mariner | Outboard | 4.5 | 2-Stroke | 1980–1985 (CAN) | 46-92970A5 | Serial 7147238 and later. |
| Mercury/Mariner | Outboard | 4.5 | 2-Stroke | 1980–1985 (AUS) | 46-92970A5 | Serial 8068065 and later. |
| Mercury/Mariner | Outboard | 6 | 2-Stroke | 1975–1986 | 46-92970A5 | Verify the 0.438-inch impeller insert size. |
| Mercury/Mariner | Outboard | 7.5 | 2-Stroke | 1979–1986 (USA) | 46-92970A5 | Serial 5206550 and later. |
| Mercury/Mariner | Outboard | 7.5 | 2-Stroke | 1979–1986 (BEL) | 46-92970A5 | Serial 9217756 and later. |
| Mercury/Mariner | Outboard | 7.5 | 2-Stroke | 1979–1986 (CAN) | 46-92970A5 | Serial 7125388 and later. |
| Mercury/Mariner | Outboard | 7.5 | 2-Stroke | 1979–1986 (AUS) | 46-92970A5 | Serial 8057545 and later. |
| Mercury/Mariner | Outboard | 9.8 | 2-Stroke | 1979–1985 (USA) | 46-92970A5 | Serial 5206550 and later. |
| Mercury/Mariner | Outboard | 9.8 | 2-Stroke | 1979–1985 (BEL) | 46-92970A5 | Serial 9217756 and later. |
| Mercury/Mariner | Outboard | 9.8 | 2-Stroke | 1979–1985 (CAN) | 46-92970A5 | Serial 7125388 and later. |
| Mercury/Mariner | Outboard | 9.8 | 2-Stroke | 1979–1985 (AUS) | 46-92970A5 | Serial 8057545 and later. |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Application
- Selected Mercury and Mariner 2-stroke outboard water-pump assemblies
- Installation Location
- Lower-unit gearcase
- Fitting Type
- Direct replacement, subject to model and serial-number verification
- Housing Material
- Marine-grade nylon PA66
- Wear Plate and Liner Material
- Stainless steel SS316
- Housing Color
- Black
- Impeller Insert Size
- 0.438 inch (11.13 mm)
- Approximate Weight
- 159 g (5.6 oz)
- Part Type
- Aftermarket replacement
What’s in the Box
- 1 × Water-pump housing
- 1 × Cover assembly
- 1 × Face plate (wear plate)
- 1 × Water-pump impeller
- 1 × Cup insert
- 1 × Woodruff impeller key
- 1 × Seal
- 2 × O-rings
- 1 × Rubber ring
- 1 × Oil seal/O-ring
- 1 × Washer
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Place a drain pan under the lower unit and drain the gearcase oil as required by the engine service procedure.
- Remove the bolts securing the lower unit to the upper leg assembly.
- Lower the gearcase carefully, taking care around the shift shaft, driveshaft, and water tube.
- Remove the old water-pump housing assembly from the lower unit.
- Clean the driveshaft, splines, keyway, and all mounting surfaces thoroughly.
- Install the new key and impeller. Confirm the impeller vanes are oriented correctly for the direction of rotation specified by the engine service information.
- Install the new housing, cover, wear plate, cup insert, seals, and O-rings. Tighten fasteners to the engine manufacturer’s specified torque.
- Reinstall the lower unit while aligning the driveshaft, water tube, and shift shaft correctly.
- Refill the gearcase with the correct marine gear oil to the specified level.
- Run the engine with an appropriate water supply and confirm a strong, steady cooling-water tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Check the engine brand, model, horsepower, stroke, market, year, and serial number against the compatibility table. Also verify that the original water-pump assembly uses a 0.438-inch (11.13 mm) impeller insert and compare the original part number before ordering.
What are the signs of a failing water-pump impeller?
Common signs include a weak or missing tell-tale stream, an overheating alarm, abnormal heat, or steam from the exhaust. Continuing to operate an engine with inadequate cooling can cause severe damage.
How often should I inspect or replace the impeller?
Inspect the impeller during scheduled maintenance and replace it when the vanes are worn, cracked, permanently set, or damaged. Replacement intervals depend on the engine manufacturer’s service schedule and operating conditions; saltwater, sand, and silt can accelerate wear.
Why are there different serial ranges for the same horsepower?
Manufacturers may use different component specifications during production runs and across markets such as the USA, Belgium, Canada, and Australia. The complete serial number helps identify the correct engine configuration.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to replace the listed Mercury water-pump references. Compare the original components and verify fitment before installation.
What should I do if the components do not match my original assembly?
Do not force installation or operate the engine. Recheck the engine model, serial number, market, original part number, and impeller insert size before contacting the seller for assistance.
Safety & Important Information
- Verify the engine model, year, market, serial number, original part number, and impeller insert size before purchase.
- Compare the replacement components with the original assembly before installation.
- Never run an outboard without an adequate water supply.
- Follow the engine manufacturer’s service manual for disassembly, torque values, gear-oil service, and testing procedures.
- Professional installation is recommended when lower-unit service experience or the correct service information is unavailable.
About Sea Sierra
- Marine Replacement Parts — Replacement components for routine outboard maintenance and repair.
- Fitment-Focused Listings — Product references and compatibility information are provided to help you compare the original part before ordering.
- Support for Installation Planning — Verify your engine details and original components before beginning service.
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