Water Pump Impeller – Fits Yamaha & Mercury/Mariner 6HP-8HP (Replaces 6G1-44352-00-00, 18-3066, 47-11590M)

Product Details

This aftermarket Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00) is engineered for a precise fit on a range of 2-stroke outboards. It is compatible with Yamaha 6HP and 8HP models from 1984 to 2009 and select Mercury/Mariner 6HP and 8HP models (6C, 6D, 8C series).

This component serves as a direct interchange for Yamaha part 6G1-44352-00-00, Sierra 18-3066, Mercury 47-11590M, and others, ensuring broad compatibility.

• Made from durable neoprene rubber for reliable performance.
• Features a 6-blade design to meet OEM flow specifications.
• Installation requires disassembly of the water pump housing.

Part Number Matrix

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

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Yamaha engines, check your model code and year. This part fits a wide range of 6HP and 8HP 2-stroke models manufactured between 1984 and 2009.

For Mercury/Mariner engines, please verify your model and serial number prefix. Specific model years are not always documented, so serial number is the most reliable method for confirmation.

Technical Specs

Product Type

Water Pump Impeller

Material

Neoprene Rubber / CR (Chloroprene Rubber)

Number of Blades

6

Impeller Height

17.85mm (0.70 inch) / 18.0mm (0.71 inch)

Overall Diameter

39.56mm (1.57 inch) / 40.0mm (1.57 inch)

Hub Shaft Diameter

11.80mm (0.46 inch) / 11.9mm (0.47 inch)

Weight

10g (0.35 oz)

What’s in the Box

• 1 x Water Pump Impeller (6G1-44352-00-00)

Installation Notes

Professional installation is highly recommended. The following are generic steps and may not exactly match your specific engine model.

1. Disconnect the battery and remove the engine cover.
2. Place the outboard in neutral and remove the lower unit bolts.
3. Carefully separate the lower unit from the upper casing to access the water pump.
4. Remove the water pump housing cover bolts and lift the housing.
5. Slide the old impeller off the driveshaft, noting the blade direction.
6. Clean and inspect the pump housing, plate, and seals for wear or damage.
7. Lightly lubricate the new impeller with marine grease.
8. Install the new impeller onto the driveshaft, turning the shaft clockwise to set the blades correctly.
9. Reinstall the water pump housing and torque bolts to manufacturer specifications.
10. Reassemble the lower unit to the engine and test operation in water.

Troubleshooting & FAQ

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.