Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)
Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller
$12.99
$15.00
$12.99
Subtotal: $12.99

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Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

$15.00 $12.99
Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

$15.00 $12.99
Description

Water Pump Impeller – Fits Tohatsu & Nissan 9.9HP-20HP (Replaces 334-65021-0)

This water pump impeller is designed for a wide range of Tohatsu and Nissan outboard motors. It fits Tohatsu 2-stroke (M9.9, M12, M15, M18) and 4-stroke (MFS9.9, MFS15, MFS18, MFS20) models, as well as Nissan 2-stroke (NS9.9, NS15, NS18) and 4-stroke (NSF9.9, NSF15, NSF18, NSF20) models.

It serves as a direct replacement for multiple OEM part numbers, including Tohatsu/Nissan 334-65021-0, Mercury 47-803748, Honda 19210-935-003, and Evinrude 5040046.

  • Installation Method: Direct Replacement
  • Fuel Compatibility: Gasoline
  • Package Contents: Includes one water pump impeller

Part Number Cross-Reference

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

Brand Part Number
Tohatsu / Nissan 334-65021-0 / 334650210 / 334650210M
Mercury 47-803748 / 8M0214944
Honda 19210-935-003
Evinrude 5040046
Sierra 18-8921

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.

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

Brand Model Rated HP Stroke OEM Part No.
Tohatsu M9.9 9.9 2-Stroke 334-65021-0
Tohatsu M12 12 2-Stroke 334-65021-0
Tohatsu M15 15 2-Stroke 334-65021-0
Tohatsu M18 18 2-Stroke 334-65021-0
Tohatsu MFS9.9 9.9 4-Stroke 334-65021-0
Tohatsu MFS15 15 4-Stroke 334-65021-0
Tohatsu MFS18 18 4-Stroke 334-65021-0
Tohatsu MFS20 20 4-Stroke 334-65021-0
Nissan NS9.9 9.9 2-Stroke 334-65021-0
Nissan NS15 15 2-Stroke 334-65021-0
Nissan NS18 18 2-Stroke 334-65021-0
Nissan NSF9.9 9.9 4-Stroke 334-65021-0
Nissan NSF15 15 4-Stroke 334-65021-0
Nissan NSF18 18 4-Stroke 334-65021-0
Nissan NSF20 20 4-Stroke 334-65021-0

Technical Specifications

Specification Value
Product Type Water Pump Impeller
Installation Direct Replacement
Fuel Type Gasoline
Housing Material Plastic Hub
Dimensions Overall Diameter: 41.11mm, Height: 23.51mm, Internal Shaft Insert Diameter: 13.88mm
Weight 12g (0.42oz)
Number of Blades 8
Other Technical Attributes For saltwater use

Package Contents

  • 1 x Water Pump Impeller (334-65021-0)

Installation Guide

  1. Safety First: Disconnect the engine's battery and remove the safety lanyard from the kill switch.
  2. Access the Lower Unit: Place the outboard in a secure position. Locate and unbolt the lower unit (gearcase) from the upper engine leg.
  3. Remove Lower Unit: Carefully separate the lower unit from the driveshaft housing. You may need to disconnect a speedometer tube or shift linkage.
  4. Open Water Pump Housing: Locate the water pump assembly on top of the lower unit. Unscrew the bolts to remove the pump cover.
  5. Remove Old Impeller: Note the rotational direction of the old impeller's blades before sliding it off the driveshaft.
  6. Inspect and Clean: Clean the inside of the pump housing and the wear plate. Inspect them for grooves, warping, or damage and replace if necessary.
  7. Install New Impeller: Lightly lubricate the new impeller and the inside of the housing. Slide the new impeller onto the driveshaft while turning the shaft clockwise to correctly bend the blades.
  8. Reassemble: Reinstall the water pump housing and torque the bolts to the manufacturer's specification.
  9. Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, water tube, and shift shaft align correctly. Bolt it securely.
  10. Test Operation: Reconnect the battery. Start the engine in a water test tank or with a hose attachment to confirm a strong and steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this impeller fits my Tohatsu or Nissan engine?

This impeller fits a range of 9.9HP to 20HP Tohatsu and Nissan outboards. Please check the 'Compatible Engine Models' table on this page to match your specific model. Verifying the OEM part number (334-65021-0) against your engine's service manual is the most reliable method.

What are the signs of a failing water pump impeller?

Common signs include a weak or non-existent water stream from the 'tell-tale' outlet, engine overheating alarms, and a noticeable decrease in engine performance. A worn or damaged impeller cannot move enough water to cool the engine effectively.

How often should I replace my water pump impeller?

For optimal reliability, it is recommended to inspect the impeller annually and replace it every 1-2 years, or after every 100-200 hours of use, depending on operating conditions. More frequent replacement may be necessary if you operate in sandy, silty, or saltwater environments.

OEM vs. Aftermarket?

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.

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

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.

What is your warranty and return policy?

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.
Shipping

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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