Water Pump Impeller – Fits Mercury/Tohatsu/Evinrude 2.5–6 HP 4-Stroke & 2–5 HP 2-Stroke (Replaces 47-161543, 369-65021-1, 5040180)

Water Pump Impeller – Fits Mercury/Tohatsu/Evinrude 2.5–6 HP 4-Stroke & 2–5 HP 2-Stroke

This water pump impeller is a direct replacement part designed for a wide range of outboard motors from leading brands, including Mercury/Mariner, Tohatsu/Nissan, and Evinrude/Johnson. Engineered to meet or exceed OEM specifications, it provides a reliable solution for maintaining your engine’s cooling system.

This component directly replaces Mercury part numbers 47-161543, 47-16154-3, 8M0204676; Tohatsu/Nissan part numbers 369-65021-1, 369650211; and Evinrude part numbers 5040180, 05040180. It also cross-references with several aftermarket parts for broad compatibility.

• Installation: Designed for direct replacement of the original impeller.
• Material: Constructed from durable neoprene rubber with a nylon insert for longevity.
• Compatibility: Fits select 2-stroke and 4-stroke models from 2 HP to 6 HP.

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.

Confirm your engine model/year in the table below.

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

Mercury/Mariner

Tohatsu/Nissan

Evinrude/Johnson

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 47-161543/369-65021-1/5040180)

Installation Guide

1. Safety First: Disconnect the engine's battery and remove the spark plug wire(s).
2. Access Lower Unit: Place the outboard in neutral and remove the bolts securing the lower unit (gearcase) to the engine leg.
3. Remove Lower Unit: Carefully lower the gearcase away from the engine. The driveshaft will slide out.
4. Open Water Pump: Locate the water pump housing on top of the gearcase and remove its mounting bolts. Slide the housing up the driveshaft.
5. Note Impeller Direction: Before removing the old impeller, observe the direction its blades are curved. The new impeller must be installed with blades facing the same direction.
6. Remove Old Impeller: Pry or slide the old impeller off the driveshaft. Remove the drive key if present.
7. Clean and Inspect: Thoroughly clean the inside of the pump housing, the wear plate, and all gasket surfaces. Replace any worn gaskets or seals.
8. Install New Impeller: Slide the new drive key and impeller onto the driveshaft. To seat it in the housing, push down while rotating the driveshaft in the direction of normal engine operation. This will correctly bend the blades.
9. Reassemble: Reinstall the water pump housing and torque the bolts to the manufacturer's specifications.
10. Reattach Lower Unit: Guide the driveshaft back into the powerhead and re-secure the lower unit with its bolts.
11. Test Operation: Reconnect the battery and attach a water supply (flushing muffs). Start the engine and verify a steady stream of water from the "tell-tale" outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my specific engine model?

A: The best way is to match your engine's serial number (for Mercury) or model and year against the compatibility tables above. Always cross-reference the OEM part number listed for your model (e.g., 47-161543) with the numbers this part replaces.

Q: What are the common signs of a failing water pump impeller?

A: The most common symptoms are a weak or nonexistent water stream from the engine's tell-tale outlet and the engine overheating, which may trigger an alarm. Reduced engine performance can also be an indicator.

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

A: As a general rule, it is recommended to replace your impeller every 1-2 years or every 100-200 hours of use, whichever comes first. However, consult your engine's service manual for the specific maintenance interval.

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.