Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller Kit
$21.50
$21.50
Subtotal: $21.50

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Water Pump Repair Kit – Fits Yamaha F40/F70 4 - Stroke Outboards (Replaces 6CJ - W0078 - 00 - 00, 6CJ - W0078 - 01 - 00) - JLM Marine Boat Parts Limited

Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)

$21.50

Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)

$21.50

Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards

This comprehensive water pump repair kit provides all necessary components to service the lower unit water pump on Yamaha F40 and F70 4-stroke outboards (2011–2016). It is engineered to meet or exceed original equipment specifications for reliable performance.

This kit is a direct replacement for Yamaha part numbers 6CJ-W0078-00-00 and 6CJ-W0078-01-00, as well as Sierra 18-3494 and Quicksilver 8M6012800 (for F70 applications).

  • Includes all required gaskets, seals, impeller, and hardware for a complete rebuild.
  • Restores cooling system performance to prevent overheating.
  • Designed for installation in the lower unit.

Part Number Cross-Reference

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

Brand Part Number
Yamaha 6CJ-W0078-00-00
Yamaha 6CJ-W0078-01-00
Sierra 18-3494
Quicksilver 8M6012800

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha F40GET 40 4-Stroke 2011–2015 6CJ-W0078-00-00 Model code 62Y>62Y6
Yamaha F70A, AET 70 4-Stroke 2011–2015 6CJ-W0078-00-00 Model code 6D71>6D79, 6D7A>6D7C
Yamaha F70LA 70 4-Stroke 2011–2016 6CJ-W0078-00-00 All F70LA variants (0112-0116, 0310, 0410, 0411)

Technical Specifications

Specification Value
Product Type Water Pump Repair Kit
Installation Lower Unit
Other Technical Attributes OEM quality replacement parts for complete water pump service

Package Contents

  • 1 x Insert, Cartridge (63D-44322-00-00)
  • 1 x Gasket, Water Pump (6CJ-44315-00-00)
  • 1 x Cover, Pump Housing (63D-44312-00-00)
  • 1 x Damper, Water Seal 2 (663-44366-00-00 / 663-44366-01-00)
  • 1 x Impeller (6H3-44352-00-00 / 6H4-44352-02-00)
  • 1 x Key, Woodruff (90280-03M03-00)
  • 2 x Oil Seal (93101-23070-00)
  • 1 x O-Ring (93210-46044-00 / 93210-59MG7-00)
  • 1 x Gasket, Water Pump (6CJ-44316-00-00 / 63D-44316-00-00)
  • 1 x Outer Plate, Cartridge (6CJ-44323-00-00 / 63D-44323-00-00)
  • 1 x Gasket, Cartridge (6CJ-44324-00-00)
  • 2 x Pin, Dowel (93604-10M03-00)
  • 2 x Bolt, With Washer (90119-08M33-00)
  • 2 x Bolt, With Washer (90119-08M14-00 / 90119-08M15-00)

Installation Guide

  1. Disconnect the negative battery cable and shift the outboard into the neutral position.
  2. Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing.
  3. Carefully lower and separate the lower unit from the engine. Be mindful of the shift shaft linkage.
  4. Unscrew the bolts on the water pump housing and remove the cover.
  5. Slide the old impeller off the driveshaft, and remove the Woodruff key, gaskets, and wear plates. Note their orientation.
  6. Thoroughly clean all mating surfaces, removing any old gasket material or sealant.
  7. Install the new cartridge insert and outer plate from the kit, followed by the new gaskets.
  8. Slide the new Woodruff key into its slot on the driveshaft and install the new impeller. Rotate the driveshaft clockwise to bend the vanes correctly.
  9. Install the new O-ring, seals, and housing cover, then tighten the bolts to the manufacturer's specified torque.
  10. Apply marine grease to the driveshaft splines and reinstall the lower unit, ensuring the water tube and shift shaft align correctly.
  11. Securely fasten the lower unit bolts.
  12. Reconnect the battery, supply water to the engine using flushing muffs, and run it to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my Yamaha engine?

This kit is designed for Yamaha F40 and F70 4-stroke outboards from 2011 to 2016. To ensure a correct fit, check the "Compatible Engine Models" table to verify your specific model and year. You should also cross-reference your existing part number with those listed in our guide (e.g., Yamaha 6CJ-W0078-00-00, Sierra 18-3494) to confirm compatibility.

What are the signs my water pump needs to be replaced?

Common signs of a failing water pump include the engine overheating, a weak or non-existent "telltale" water stream from the outlet, or a visibly cracked, brittle, or damaged impeller found during a routine inspection.

How often should I replace my outboard's water pump impeller?

For preventative maintenance, it is recommended to inspect and replace the water pump impeller and related components every 100-200 operating hours or at least once per boating season. Replacement intervals should be shorter if you frequently operate in sandy, silty, or saltwater conditions.

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.

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.

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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