Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller
$17.50
$17.50
Subtotal: $17.50

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Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1 - 44352 - 00 - 00) - JLM Marine Boat Parts Limited

Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00)

$17.50

Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00)

$17.50

Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00)

This water pump impeller is designed for a precise fit on a range of Yamaha and Mercury/Mariner 2-stroke outboard motors. It is compatible with Yamaha 6HP and 8HP models from 1984 to 2009, as well as Mercury/Mariner 6HP (6C, 6D) and 8HP (8C) series engines.

Engineered as a direct replacement for the original component, this impeller ensures reliable performance for your cooling system. It is cross-compatible with multiple OEM and aftermarket part numbers, facilitating a straightforward replacement process.

  • Material: High-strength Neoprene (CR) rubber for durability and longevity.
  • Included Component: Contains one water pump impeller.
  • Installation: Requires disassembly of the water pump housing.

Part Number Cross-Reference

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

Brand Part Number
Yamaha 6G1-44352-00-00 / 6G1-44352-00
Sierra 18-3066
Mercury 47-11590M
Mallory 9-45610
CEF 500302
GLM 89870

Compatible Engine Models

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

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.

Yamaha 2-Stroke Outboard

Model Rated HP Stroke Years OEM Part No. Notes
6HP 6SJ 6 2-Stroke 1986 6G1-44352-00-00
6HP 6LJ 6 2-Stroke 1986 6G1-44352-00-00
6HP 6SH 6 2-Stroke 1987 6G1-44352-00-00
6HP 6LH 6 2-Stroke 1987 6G1-44352-00-00
6HP 6SG 6 2-Stroke 1988 6G1-44352-00-00
6HP 6LG 6 2-Stroke 1988 6G1-44352-00-00
6HP 6SF 6 2-Stroke 1989 6G1-44352-00-00
6HP 6LF 6 2-Stroke 1989 6G1-44352-00-00
6HP 6SD 6 2-Stroke 1990 6G1-44352-00-00
6HP 6LD 6 2-Stroke 1990 6G1-44352-00-00
6HP 6MSHP 6 2-Stroke 1991 6G1-44352-00-00
6HP 6MLHP 6 2-Stroke 1991 6G1-44352-00-00
6HP 6MSHQ 6 2-Stroke 1992 6G1-44352-00-00
6HP 6MLHQ 6 2-Stroke 1992 6G1-44352-00-00
6HP 6MSHR 6 2-Stroke 1993 6G1-44352-00-00
6HP 6MLHR 6 2-Stroke 1993 6G1-44352-00-00
6HP 6MSHS 6 2-Stroke 1994 6G1-44352-00-00
6HP 6MLHS 6 2-Stroke 1994 6G1-44352-00-00
6HP 6MSHT 6 2-Stroke 1995 6G1-44352-00-00
6HP 6MLHT 6 2-Stroke 1995 6G1-44352-00-00
6HP 6MSHU 6 2-Stroke 1996 6G1-44352-00-00
6HP 6MLHU 6 2-Stroke 1996 6G1-44352-00-00
6HP 6MSHV 6 2-Stroke 1997 6G1-44352-00-00
6HP 6MLHV 6 2-Stroke 1997 6G1-44352-00-00
6HP 6MSHW 6 2-Stroke 1998 6G1-44352-00-00
6HP 6MLHW 6 2-Stroke 1998 6G1-44352-00-00
6HP 6MSHX 6 2-Stroke 1999 6G1-44352-00-00
6HP 6MLHX 6 2-Stroke 1999 6G1-44352-00-00
6HP 6MSHY 6 2-Stroke 2000 6G1-44352-00-00
6HP 6MLHY 6 2-Stroke 2000 6G1-44352-00-00
8HP 8LN 8 2-Stroke 1984 6G1-44352-00-00
8HP 8SN 8 2-Stroke 1984 6G1-44352-00-00
8HP 8LK 8 2-Stroke 1985 6G1-44352-00-00
8HP 8SK 8 2-Stroke 1985 6G1-44352-00-00
8HP 8LJ 8 2-Stroke 1986 6G1-44352-00-00
8HP 8SJ 8 2-Stroke 1986 6G1-44352-00-00
8HP 8LH 8 2-Stroke 1987 6G1-44352-00-00
8HP 8SH 8 2-Stroke 1987 6G1-44352-00-00
8HP 8LG 8 2-Stroke 1988 6G1-44352-00-00
8HP 8SG 8 2-Stroke 1988 6G1-44352-00-00
8HP 8LF 8 2-Stroke 1989 6G1-44352-00-00
8HP 8SF 8 2-Stroke 1989 6G1-44352-00-00
8HP 8LD 8 2-Stroke 1990 6G1-44352-00-00
8HP 8SD 8 2-Stroke 1990 6G1-44352-00-00
8HP 8MSHP 8 2-Stroke 1991 6G1-44352-00-00
8HP 8MLHP 8 2-Stroke 1991 6G1-44352-00-00
8HP 8MSHQ 8 2-Stroke 1992 6G1-44352-00-00
8HP 8MLHQ 8 2-Stroke 1992 6G1-44352-00-00
8HP 8MSHR 8 2-Stroke 1993 6G1-44352-00-00
8HP 8MLHR 8 2-Stroke 1993 6G1-44352-00-00
8HP 8MSHS 8 2-Stroke 1994 6G1-44352-00-00
8HP 8MLHS 8 2-Stroke 1994 6G1-44352-00-00
8HP 8MSHT 8 2-Stroke 1995 6G1-44352-00-00
8HP 8MLHT 8 2-Stroke 1995 6G1-44352-00-00
8HP 8MSHU 8 2-Stroke 1996 6G1-44352-00-00
8HP 8MLHU 8 2-Stroke 1996 6G1-44352-00-00
8HP 8MSHV 8 2-Stroke 1997 6G1-44352-00-00
8HP 8MLHV 8 2-Stroke 1997 6G1-44352-00-00
8HP 8MSHW 8 2-Stroke 1998 6G1-44352-00-00
8HP 8MLHW 8 2-Stroke 1998 6G1-44352-00-00
8HP 8MSHX 8 2-Stroke 1999 6G1-44352-00-00
8HP 8MLHX 8 2-Stroke 1999 6G1-44352-00-00
8HP 8MSHY 8 2-Stroke 2000 6G1-44352-00-00
8HP 8MLHY 8 2-Stroke 2000 6G1-44352-00-00
8HP 8MSHZ 8 2-Stroke 2001 6G1-44352-00-00
8HP 8MSHA 8 2-Stroke 2002 6G1-44352-00-00
8HP 8MSHB 8 2-Stroke 2003 6G1-44352-00-00
8HP 8MSHC 8 2-Stroke 2004 6G1-44352-00-00
8HP 8MSHD 8 2-Stroke 2005 6G1-44352-00-00
8HP 8MSH 8 2-Stroke 2005–2009 6G1-44352-00-00 Years 2005-2009 models

Mercury/Mariner Outboard

Model Rated HP Stroke OEM Part No. Notes
6C 6 2-Stroke 47-11590M Serial # begins with 6H8
6D 6 2-Stroke 47-11590M Serial # begins with 6H6
8C 8 2-Stroke 47-11590M Serial # begins with 6G1

Technical Specifications

Specification Value
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)
Installation Direct replacement; requires water pump housing disassembly

Package Contents

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

Explosion Diagram

Explosion Diagram

Installation Guide

  1. Safety First: Disconnect the engine's battery and remove the spark plug wires to prevent accidental starting.
  2. Access the Lower Unit: Remove the bolts securing the gearcase (lower unit) to the engine's midsection and carefully lower it.
  3. Open Water Pump Housing: Locate the water pump assembly on top of the gearcase. Unscrew the bolts to remove the housing cover.
  4. Remove Old Impeller: Take note of the blade orientation. Pull the old impeller straight off the driveshaft. A key or pin may also need to be removed.
  5. Clean and Inspect: Thoroughly clean the inside of the housing and the wear plate. Check for scoring, warping, or corrosion and replace if necessary.
  6. Install New Impeller: Slide the new impeller onto the driveshaft. While pushing down, turn the driveshaft clockwise to help bend the blades in the correct direction.
  7. Reassemble Housing: Apply a light coat of marine grease to the inside of the housing and reinstall the cover, tightening the bolts to the manufacturer's specified torque.
  8. Reattach Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts.
  9. Test Operation: Reconnect the battery and spark plugs. Start the engine in a test tank or with a water flusher to confirm the cooling system is pumping water.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: The best method is to compare your existing part's specifications and appearance with the images and data provided here. Check the compatible model tables and cross-reference your part number. When in doubt, use the linked guides to find your engine's model or serial number to be certain.

Q: What are the signs of a failing water pump impeller?
A: A weak or no water stream from the "tell-tale" port is the most common sign. Other indicators include engine overheating alarms, a hot-to-the-touch engine exterior, or reduced engine performance.

Q: How often should I replace the impeller?
A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage (hours) and operating conditions (saltwater vs. freshwater). An impeller can fail from age and disuse, not just from high hours.

Q: Is it necessary to buy a full water pump repair kit?
A: While this listing is for the impeller only, a full kit (which includes the housing, gaskets, and wear plate) is recommended if the existing housing shows signs of warping, scoring, or corrosion, as this can cause premature failure of a new impeller.

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.

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).
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  • 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.

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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