Water Pump Repair Kit – Fits Mercury Marine/Mariner 6-15 HP (Replaces 46-42089A5)
Water Pump Repair Kit – Fits Mercury Marine/Mariner 6-15 HP (Replaces 46-42089A5) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Repair Kit – Fits Mercury Marine/Mariner 6-15 HP (Replac...
Water Pump Repair Kit – Fits Mercury Marine/Mariner 6-15 HP (Replaces 46-42089A5) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit for Mercury outboard motors is designed for a broad range of engines, including 6 to 15 HP 2-Stroke models manufactured between 1986 and 1993, and 8 to 15 HP 4-Stroke models from 1994 to 2006. It provides the essential components needed to restore cooling system performance and prevent overheating.
This kit serves as a direct replacement for Mercury part numbers 46-42089A5, 46-42089A4, and 46-42089A3, as well as aftermarket equivalents GLM 12051, Sierra AM46-42089A5, and AM8M0176126.
- Installs as a direct replacement for the original pump assembly.
- Engineered to meet or exceed OEM specifications for fit and function.
- Includes the critical impeller (replaces 47-43038Q02) for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Mercury | 46-42089A5 |
| Mercury | 46-42089A4 |
| Mercury | 46-42089A3 |
| GLM | 12051 |
| Sierra | AM46-42089A5 |
| Aftermarket | AM8M0176126 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
For Mercury & Mariner Engines: This kit fits a wide variety of 2-stroke and 4-stroke models from 6 HP to 15 HP made between the mid-1980s and mid-2000s, including Sea Pro and Marathon configurations.
For Force Engines: This kit is compatible with select 9.9 HP and 15 HP 2-stroke models from 1998.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Various 6 M/ML | 6 | 2-Stroke | 1986–2005 | 46-42089A5 | Includes models: 1006206/07, 1006226/27, 6M, 6ML, 6MH, 6MLH |
| Mercury | Various 8 M/ML | 8 | 2-Stroke | 1986–2005 | 46-42089A5 | Includes models: 1008206/07, 1008226/27, 8M, 8ML, 8MH, 8MLH |
| Mercury | Various 9.9 M/ML/E/EL | 9.9 | 2-Stroke | 1986–2004 | 46-42089A5 | Includes models: 1010136/56/57/87, etc. |
| Mercury | Various 15 M/ML/E/EL | 15 | 2-Stroke | 1988–2004 | 46-42089A5 | Multiple configurations including Sea Pro & Marathon |
| Mercury | Various 8 M/ML | 8 | 4-Stroke | 2000–2006 | 46-42089A5 | Models: 1B08203/213 series, includes Belgian & US-made |
| Mercury | Various 9.9 M/ML | 9.9 | 4-Stroke | 1996–2004 | 46-42089A5 | Models: 1F10203/213 series |
| Mercury | Various 15 M/ML | 15 | 4-Stroke | 1998–2006 | 46-42089A5 | Models: 1F15203/213 series |
| Mariner | 8 ML/ALT | 8 | 2-Stroke | 1987 | 46-42089A5 | Model: 7008237 |
| Mariner | 9.9 M/ML/E/EL | 9.9 | 2-Stroke | 1987 | 46-42089A5 | Models: 7010207/227/507/527 |
| Force | Various 9.9/15 MH/MLH | 9.9-15 | 2-Stroke | 1998 | 46-42089A5 | Models: H009201/211, H015201/211 series |
Technical Specs
- Product Type
- Outboard Water Pump Repair Kit
- Installation
- Direct Replacement
- Contains
- Impeller #47-43038Q02
- Dimensions
- 117.6 mm L × 98.5 mm W × 98.5 mm H (4.63 × 3.88 × 3.88 in)
- Weight
- 0.313 kg (0.69 lb)
- Warranty
- Varies by seller (1 year standard)
What’s in the Box
- 1 x Water Pump Impeller (47-43038Q02)
- 1 x Impeller Base Gasket
- 1 x Water Pump Housing Gasket
- 1 x Impeller Key
- 1 x Drive Shaft Seal
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the gearcase oil from the lower unit.
- Unbolt and remove the lower unit (gearcase) from the outboard's midsection.
- Locate and unbolt the water pump housing to access the old impeller and gaskets.
- Remove the old impeller, key, gaskets, and seals. Clean all mating surfaces thoroughly.
- Install the new gaskets, drive shaft seal, and impeller key.
- Slide the new impeller into the housing while turning the driveshaft clockwise to seat the vanes correctly.
- Reinstall the water pump housing, ensuring bolts are torqued to manufacturer specifications.
- Reattach the lower unit to the midsection and refill the gearcase with fresh oil.
- Reconnect the battery and test the engine in a suitable water source, verifying water is exiting the tell-tale port.
Troubleshooting & FAQ
How do I know if this water pump kit will fit my specific engine model?
The surest way is to check your engine's part manual for part number 46-42089A5. You can also review the 'Engine & Model Compatibility' table on this page. Cross-reference your engine's brand, model, horsepower, and year to confirm a match.
What are the common signs of a failing water pump?
Symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and in severe cases, steam from the exhaust. Reduced engine performance can also be an indicator.
How often should I replace my outboard's water pump impeller?
As a general rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy or silty water.
Does this kit contain the plastic water pump housing?
No, this is a repair kit focused on the wear items. It contains the impeller, gaskets, and seals. The housing is sold separately if yours is cracked, warped, or excessively worn.
Is this a difficult part to install?
For those with mechanical experience and the right tools, it is a manageable DIY job that takes 1-2 hours. However, it involves removing the lower unit. If you are not comfortable with this process, we recommend professional installation.
Why is my engine still overheating after installing the new kit?
Check for blockages in the cooling water passages, a stuck thermostat, or incorrect installation (e.g., a folded impeller vane or leaking gasket). Ensure all sealing surfaces were clean and bolts were torqued properly.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
How fast do you ship and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free, and expedited options will appear at checkout if they are available for your location.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you experience an issue, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original packaging. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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