Water Pump Impeller Kit – Fits Mercury Mariner Force 30-70 HP 4-Stroke (Replaces 47-812966A11, 47-812966A12)

$51.64 $82.00

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Water Pump Impeller Kit – Fits Mercury Mariner Force 30-70 HP 4-Stroke (Replaces 47-812966A11, 47-812966A12) is backordered and will ship as soon as it is back in stock.

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Product Details

This Water Pump Impeller Kit – Fits Mercury Mariner Force 30-70 HP 4-Stroke (Replaces 47-812966A11, 47-812966A12) is a complete repair solution for Mercury, Mariner, and Force 30-70 HP 4-stroke outboard engines from 1998 to the present. Fitment is specific to models with a gearcase torpedo diameter of 3.44 inches (87.38mm).

It serves as a direct aftermarket replacement for Mercury OEM part numbers 47-812966A11, 47-812966A12, 46-812966A4, 46-812966A5, 46-812966A6, 46-14334A1, 46-14334A2, 46-14334A3, and Sierra 18-3690.

Engineered as a direct-fit replacement for straightforward installation.
Constructed with a durable neoprene rubber impeller, stainless steel housing, and marine-grade gaskets and O-rings.
Important: You must verify your gearcase torpedo diameter is 3.44" (87.38mm) before ordering to ensure correct fitment.

Part Number Matrix

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

Brand	Part Number
Mercury	47-812966A11
Mercury	47-812966A12
Mercury	46-812966A4
Mercury	46-812966A5
Mercury	46-812966A6
Mercury	46-14334A1
Mercury	46-14334A2
Mercury	46-14334A3
Sierra	18-3690

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit is compatible with a wide range of Mercury 4-stroke outboards. Please use your engine's serial number to find the exact match in the notes column.

The same part also fits equivalent Mariner and Force 30-70 HP 4-stroke models from 1998–present.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	Driveshaft-Long-2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	Carb 3 CYL [1B227000-1B344306]
Mercury	Driveshaft-Long-2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI 3 CYL [1B227000-1B355027]
Mercury	Driveshaft-1.83:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [0T409000-1B355222]
Mercury	Driveshaft-1.83:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [1C000001-1C050251]
Mercury	Driveshaft-1.83:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [1C050252 & Up]
Mercury	Driveshaft-1.83:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI Jet 4 CYL [1C051324 & Up]
Mercury	Driveshaft-1.83:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI SeaPro 4 CYL [1C453840 & Up]
Mercury	Driveshaft-1.83:1 Gear Ratio	50	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [0P153500-0P580772] (Belgium)
Mercury	Driveshaft-1.83:1 Gear Ratio	50	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [0T409000-1B355222]
Mercury	Driveshaft-1.83:1 Gear Ratio	50	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [1C000001 & Up]
Mercury	Driveshaft-1.83:1 Gear Ratio	60	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [0P153500-0P580772] (Belgium)
Mercury	Driveshaft-1.83:1 Gear Ratio	60	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [0T409000-1B355222]
Mercury	Driveshaft-1.83:1 Gear Ratio	60	4-Stroke	1998–present	46-812966A12	EFI 4 CYL [1C000001-1C453839]
Mercury	Driveshaft-1.83:1 Gear Ratio	60	4-Stroke	1998–present	46-812966A12	EFI SeaPro 4 CYL [1C453840 & Up]
Mercury	Driveshaft-1.83:1 Gear Ratio	60	4-Stroke	1998–present	46-812966A12	Formula 60 [1C104574-1C782687]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	30	4-Stroke	1998–present	46-812966A12	[1C456300 & Up]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	30	4-Stroke	1998–present	46-812966A12	EFI [1C109093-1C456299]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	[1C018826 & Up]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1C043417-1C456299]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1C049739 & Up]
Mercury	Gear Housing Driveshaft 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1C456300 & Up]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	[0P401000 & Up]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	[1B227000-1B344306]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	[1C000001-1C018825]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [0P401000-0P515896]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1B227000-1B355027]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1C000001-1C043416]
Mercury	Gear Housing Driveshaft Long 2:1 Gear Ratio	40	4-Stroke	1998–present	46-812966A12	EFI [1C000001-1C049738]
Mariner	Outboard	30-70	4-Stroke	1998–present	46-812966A12	Same part fits equivalent Mariner models
Force	Outboard	30-70	4-Stroke	1998–present	46-812966A12	Same part fits equivalent Force models

Technical Specs

Product Type: Water Pump Impeller Kit
Installation: Direct replacement, fits gearcase torpedo diameter 3.44" (87.38mm)
Housing Material: Neoprene Rubber Impeller and O-rings, Stainless Steel Plate and Housing
Housing Color: Black (impeller), Silver (stainless components)
Weight: 0.65 kg (1.43 lbs)
Warranty: 30-day refund/replacement
Important Note: This repair kit is easily confused with similar horsepower models. Verify torpedo diameter before ordering.

What’s in the Box

1 x Impeller (47-19453T)
1 x Impeller Key (28-8M0032831)
1 x Pump Housing (14334A3)
1 x Wear Plate (19700A2)
1 x Pump Base (46-812966A7)
1 x Lower Wear Plate Gasket (27-19701)
1 x Gasket Upper (27-822189)
1 x Tube Seal (859770/8597701/893857)
2 x O-Rings (805726)
2 x Washer-Plastic (12-858234)
3 x Seal (26-830749)
4 x Stainless Steel Washers

Installation Notes

Disconnect the battery and remove the engine cover.
Shift the outboard into neutral and remove the bolts securing the lower unit (gearcase) to the engine.
Carefully lower the gearcase away from the engine.
Remove the old water pump housing, impeller, gaskets, and wear plate. Clean all mating surfaces thoroughly.
Install the new lower gasket, wear plate, and impeller key onto the driveshaft.
Slide the new impeller onto the driveshaft, turning clockwise to seat the blades correctly.
Install the new housing, O-rings, seals, and gaskets as included in the kit.
Lightly grease the inside of the housing and re-secure it.
Re-install the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
Reconnect the battery and test the engine in water, confirming a steady stream of water from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?

This kit is very specific. First, ensure your engine is a Mercury, Mariner, or Force 30-70 HP 4-stroke model from 1998 or newer. The most critical step is to measure the torpedo diameter of your lower unit's gearcase—it must be 3.44 inches (87.38mm). If it is different, this kit will not fit. Use the serial number ranges in the compatibility table to further verify your specific model.

What are the signs of a failing water pump impeller?

The most common sign is engine overheating at idle or low speeds. You may also notice a weak or nonexistent water stream from the "tell-tale" outlet port. Reduced engine performance and steam from the exhaust are also indicators.

How often should the water pump impeller be replaced?

As a preventative maintenance item, it is 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, silty, or saltwater conditions.

Why is the torpedo diameter so important?

Mercury produced different gearcase sizes for outboards in the same horsepower range. This kit is designed exclusively for the larger 3.44" diameter gearcase. Ordering without verifying this dimension is the most common reason for receiving an incorrect part.

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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