Water Pump Kit – Fits Mercury/Mariner 6–15 HP (Replaces 46-42089A5)

$53.09 $84.00

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Water Pump Kit – Fits Mercury/Mariner 6–15 HP (Replaces 46-42089A5) is backordered and will ship as soon as it is back in stock.

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Product Details

This Water Pump Kit – Fits Mercury/Mariner 6–15 HP (Replaces 46-42089A5) is designed for Mercury/Mariner 2-Stroke 6–15 HP (1986–Up) and 4-Stroke 8–15 HP (1995–2004) outboard motors with a standard gearcase (non-BigFoot models). It contains all necessary components to service and restore your engine's cooling system.

It serves as a direct interchange for Mercury/Mariner part numbers 46-42089A5, 46-42089A4, and 46-42089A3. It is also compatible with select 1998 Force/Sears 9.9 HP and 15 HP models.

Engineered for direct-fit OEM replacement applications.
Includes a durable metal alloy housing and a high-performance neoprene rubber impeller.
Provides a complete solution with all required gaskets, seals, and hardware for a full service.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Mercury/Mariner	46-42089A5	Current direct replacement number.
Mercury/Mariner	46-42089A4	Superseded by 46-42089A5.
Mercury/Mariner	46-42089A3	Superseded by 46-42089A4.
Force/Sears	-	Compatible with 1998 models for 9.9–15 HP.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Mercury/Mariner models, pay close attention to the serial number ranges to ensure correct fitment. USA-made engines and BEL (Belgium)-made engines often have different serial number sequences.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury/Mariner	Standard	6	2-Stroke	1986–Up	46-42089A5	Serial Number 0A197112 and Up (USA)
Mercury/Mariner	Standard	6	2-Stroke	1986–93	46-42089A5	Serial Number 9461526 and Up (BEL)
Mercury/Mariner	Standard	8	2-Stroke	1986–Up	46-42089A5	Serial Number 0A197112 and Up (USA)
Mercury/Mariner	Standard	8	2-Stroke	1986–93	46-42089A5	Serial Number 9461526 and Up (BEL)
Mercury/Mariner	Standard	9.9	2-Stroke	1986–98	46-42089A5	Serial Number 0A197112 and Up (USA)
Mercury/Mariner	Standard	9.9	2-Stroke	1986–93	46-42089A5	Serial Number 9461526 and Up (BEL)
Mercury/Mariner	Standard	15	2-Stroke	1988–98	46-42089A5	Serial Number 0B292414 and Up (USA)
Mercury/Mariner	Standard	15	2-Stroke	1988–93	46-42089A5	Serial Number 9542620 and Up (BEL)
Mercury/Mariner	XR10, Sea Pro, 10 Mag, Marathon	10	2-Stroke	1990–98	46-42089A5	Serial Number 0D038000 and Up (USA)
Mercury/Mariner	XR10, Sea Pro, 10 Mag, Marathon	10	2-Stroke	1990–98	46-42089A5	Serial Number 9596000 and Up (BEL)
Mercury/Mariner	15 Sea Pro, Marathon	15	2-Stroke	1994–98	46-42089A5	Serial Number 0G044365 and Up (USA)
Mercury/Mariner	15 Sea Pro, Marathon	15	2-Stroke	1997–98	46-42089A5	Serial Number 9927000 and Up (BEL)

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury/Mariner	Standard (232cc)	8	4-Stroke	1995–2004	46-42089A5	Serial Number 0G760300–0T178499
Mercury/Mariner	Standard (232cc)	8	4-Stroke	-	46-42089A5	Serial Number 0H017100–0H017349 (BEL)
Mercury/Mariner	Standard (232cc)	9.9	4-Stroke	1995–98	46-42089A5	Serial Number 0H000058–0H016909 (USA)
Mercury/Mariner	Standard (323cc, Non-BigFoot)	9.9	4-Stroke	1999–2004	46-42089A5	Serial Number 0G760300–0T979999 (USA)
Mercury/Mariner	Standard (323cc, Non-BigFoot)	9.9	4-Stroke	-	46-42089A5	Serial Number 0P075166–0P325499 (BEL)
Mercury/Mariner	Standard (323cc, Non-BigFoot)	15	4-Stroke	1998–2004	46-42089A5	Serial Number 0G590000–1B727495 (USA)
Mercury/Mariner	Standard (323cc)	15	4-Stroke	1998	46-42089A5	Serial Number 0G590000 and Up (USA)
Mercury/Mariner	Standard (323cc)	15	4-Stroke	-	46-42089A5	Serial Number 9973100 and Up (BEL)

Brand	Model	Rated HP	Stroke	Years	Notes
Force/Sears	Standard	9.9	2-Stroke	1998	Compatible with 1998 models
Force/Sears	Standard	15	2-Stroke	1998	Compatible with 1998 models

Technical Specs

Product Type: Water Pump Impeller Repair Kit with Housing
Installation: Direct replacement for OEM applications
Housing Material: Metal alloy
Impeller Material: Neoprene rubber
Weight: 298g (10.5 oz)

What’s in the Box

1 x Impeller (47-42038-2)
1 x Wear Plate (42200)
2 x Gasket (27-19202/27-19204-3)
2 x Gasket (12-19183)
2 x Gasket (19643)
1 x Pump Base (46-420T5)
1 x Pump Housing (46-42089A2)
1 x Retainer (42375)
2 x Oil Seal (26-41365-1)
2 x Seal (26-33613/26-42133)
1 x Screw (10-48408)
2 x Washer (12-16448)
1 x Quad Ring (25-822236)

Installation Notes

Disconnect the battery and remove the engine cover.
Drain the gearcase oil completely.
Remove the bolts securing the lower unit (gearcase) to the upper leg.
Carefully lower and detach the lower unit from the engine.
Unbolt and remove the old water pump housing to access the impeller.
Clean the pump base and mating surfaces, removing any old gasket material.
Install the new wear plate, gaskets, and impeller in the correct orientation.
Secure the new pump housing over the impeller and tighten the bolts to spec.
Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
Refill the gearcase with the correct grade and amount of lower unit oil.
Start the engine in a test tank or with a water flusher to confirm water is pumping from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my specific engine?

The most reliable method is to match your engine's serial number to the ranges listed in the compatibility tables. While year and model are good indicators, the serial number is definitive. Pay special attention to the manufacturing location (USA or BEL), as this can affect fitment.

What are the signs of a failing water pump impeller?

Common signs include a weak or nonexistent water stream from the "tell-tale" outlet, engine overheating alarms, and in severe cases, steam from the exhaust. It's recommended to replace the impeller as part of routine maintenance before these symptoms appear.

How often should the water pump impeller be replaced?

For most recreational boaters, it is recommended to inspect the impeller annually and replace it every 1-2 years, regardless of appearance. For commercial or high-hour use, replacement every year (or every 100-200 hours) is a safe interval.

Is there a difference in cooling performance compared to the OEM part?

This aftermarket kit is designed to meet or exceed OEM specifications. The neoprene impeller is formulated for durability and efficient water flow, providing cooling performance comparable to the original factory part under normal operating conditions.

My engine's serial number is from a "BEL" (Belgium) plant and the chart doesn't list a year range. How do I know it fits?

For many European-made (BEL) models, the fitment is based on the serial number being "Up" from a certain number, without a specific end year. If your serial number is higher than the one listed for your HP/model, this kit is the correct fit.

Is this kit hard to install?

Installation is a common maintenance task for those with mechanical experience. It involves removing the lower unit. If you are not comfortable performing this procedure, we recommend consulting a qualified marine mechanic. An improper installation can lead to engine damage.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, 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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