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

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

This water pump impeller repair kit is designed for Mercury, Mariner, and Force 30-70 HP 4-stroke outboard engines (1998–present) that have a gearcase torpedo diameter of 3.44 inches (87.38mm). Please verify this critical dimension before ordering to ensure correct fitment.

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

• Engine Fitment: Mercury/Mariner/Force 30-70 HP 4-Stroke (1998+) with a 3.44" torpedo diameter.
• Durable Construction: Features a high-performance neoprene rubber impeller, stainless steel wear plate and housing, and robust gaskets and O-rings for longevity.
• Complete Kit: Includes all necessary components for a full water pump rebuild, including the impeller, housing, plates, gaskets, seals, and hardware.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 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) - Note: The longer tube seal (893857) is for 4-stroke engines
• 2 x O-Rings (805726)
• 2 x Washer-Plastic (12-858234)
• 3 x Seal (26-830749)
• 4 x Stainless Steel Washers

Installation Guide

1. Disconnect the battery and shift the outboard gear into neutral.
2. Remove the lower unit (gearcase) by unbolting it from the engine's mid-section.
3. Locate and unbolt the water pump housing to access the old impeller.
4. Carefully remove the old impeller, key, gaskets, and wear plate. Clean all mating surfaces thoroughly.
5. Install the new lower gasket and stainless steel wear plate onto the pump base.
6. Insert the new impeller key into the slot on the driveshaft.
7. Slide the new impeller onto the driveshaft. Rotate the driveshaft clockwise while pushing down to seat the impeller vanes correctly inside the housing.
8. Install the new upper gasket, seals, and O-rings onto the pump housing.
9. Secure the pump housing with the bolts, tightening them to the manufacturer-specified torque in a crisscross pattern.
10. Reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube are correctly aligned.
11. Reconnect the battery. Start the engine in a suitable water source and immediately check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller kit fits my Mercury engine?

A: The most critical step is to verify your lower unit's torpedo diameter is 3.44 inches (87.38mm). This kit is often confused with others for similar HP engines. Cross-reference the OEM part numbers listed and check the serial number ranges in our compatibility table to ensure a perfect match.

Q: What are the signs my water pump impeller needs replacement?

A: Common signs that your impeller is failing include a weak or non-existent water stream from the "tell-tale" pisser port, a steadily rising engine temperature gauge at idle or low speeds, or a low water pressure alarm if your engine is equipped with one.

Q: How often should I replace the water pump impeller?

A: For preventative maintenance, it is recommended to inspect and/or replace your water pump impeller every 100-200 operating hours or at least once per season, whichever comes first. This helps prevent overheating and costly engine damage.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.