Water Pump Base – Fits Mercury/Mariner 30-60 HP & Force 70-75 HP (Replaces 46-812966A7)
Water Pump Base – Fits Mercury/Mariner 30-60 HP & Force 70-75 HP (Replaces 46-812966A7) 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 Base – Fits Mercury/Mariner 30-60 HP & Force 70-75 HP (Replaces 46-812966A7) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Base – Fits Mercury/Mariner 30-60 HP & Force 70-75 HP (Replaces 46-812966A7) is a direct-fit replacement for Mercury/Mariner 30-60 HP (3 & 4 cylinder, 2-Stroke & 4-Stroke) engines from 1991 and newer, as well as Force 70-75 HP (3 cylinder, 2-Stroke) engines from 1991–1998.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 46-812966A7, 46-812966A9, 46-81266A3, Sierra 18-3445, GLM 12352, and Mallory 9-43330.
- Designed for direct OEM replacement installation.
- Constructed with a durable stainless steel housing for longevity.
- Manufactured to meet or exceed OEM specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 46-81266A3 | 46-812966A9 |
| Mercury | 46-812966A9 | 46-812966A7 |
| Mercury | 46-812966A7 | |
| Sierra | 18-3445 | |
| GLM | 12352 | |
| Mallory | 9-43330 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner Outboards: Fits various 3 & 4 cylinder, 2-Stroke and 4-Stroke models from 30 HP to 60 HP, generally from 1991 and newer.
For Force Outboards: Compatible with 70 HP and 75 HP 3-cylinder models manufactured between 1991 and 1998.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 30 HP | 30 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 35 HP | 35 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 35 HP JET | 35 | 2-Stroke | After 1C453840 | 46-812966A7 | |
| Mercury | 40 HP | 40 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 40 HP EFI | 40 | 2-Stroke | 2006-Up | 46-812966A7 | |
| Mercury | 40 HP (4-Stroke) | 40 | 4-Stroke | 2001–2012 | 46-812966A7 | |
| Mercury | 40 HP EFI JET | 40 | Various | 1999–2010 | 46-812966A7 | |
| Mercury | 45 HP JET | 45 | Various | 1991–2004 | 46-812966A7 | |
| Mercury | 50 HP (3 Cyl) | 50 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 50 HP EFI | 50 | Various | 2001–2012 | 46-812966A7 | |
| Mercury | 55 HP (3 Cyl) | 55 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 60 HP (3 Cyl) | 60 | 2-Stroke | 1991–2006 | 46-812966A7 | |
| Mercury | 60 HP EFI | 60 | Various | 2001–2012 | 46-812966A7 | |
| Mercury | 60 HP BIGFOOT | 60 | Various | 1998–2006 | 46-812966A7 | |
| Mercury | 60 HP SEAPRO | 60 | Various | After 1C453840 | 46-812966A7 | |
| Mercury | FORMULA 60 | 60 | 46-812966A7 | |||
| Force | 70 HP FORCE | 70 | 2-Stroke | 1991–1995 | 46-812966A7 | |
| Force | 75 HP FORCE | 75 | 2-Stroke | 1996–1998 | 46-812966A7 |
Technical Specs
- Product Type
- Water Pump Base
- Installation
- Direct OEM replacement
- Housing Material
- Stainless Steel
- Manufacturing
- Manufactured to OEM specifications
What’s in the Box
- 1 x Water Pump Base (Replaces 46-812966A7)
Installation Notes
- Disconnect the main battery cables to prevent electrical accidents.
- Drain the gearcase oil from the lower unit.
- Remove the propeller and unbolt the lower unit from the outboard’s midsection.
- Carefully remove the old water pump housing, gaskets, and impeller to access the pump base.
- Unbolt and remove the old water pump base, taking note of its orientation.
- Thoroughly clean the mating surfaces on the lower unit to ensure a proper seal.
- Install the new water pump base with any required seals or gaskets.
- Reassemble the water pump with a new impeller and gaskets.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Refill the gearcase with the manufacturer-specified lubricant.
Troubleshooting & FAQ
How do I know if this water pump base fits my engine?
Always verify your fitment using the detailed compatibility tables provided. Check your engine brand, model, horsepower, and year range. For complete certainty, cross-reference your existing part number with the comprehensive list in our Part Number Matrix.
What are the signs of a failing water pump base?
Common symptoms include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the tell-tale (pee hole), or visible cracks, warping, or corrosion on the old base during a physical inspection.
Can I reuse my existing impeller and gaskets with this new base?
While this base is designed to work with all OEM and equivalent components, it is strongly recommended to replace the impeller, gaskets, and wear plate at the same time you replace the base to ensure a complete and reliable repair.
How often should the water pump assembly be serviced?
For preventative maintenance, the entire water pump assembly, including the impeller and base, should be inspected annually. We recommend a full replacement every 1-2 years or 100-200 hours of operation, especially if operating in saltwater or debris-heavy water.
What is the difference between OEM and aftermarket parts?
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.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
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.
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.
