SKU: 30029934864

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

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Description

Water Pump Repair Kit – Fits Yamaha F40/F70 4-Stroke Outboards (Replaces 6CJ-W0078-00-00, 6CJ-W0078-01-00)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 (20112016). 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

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 30029934864

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4.5 ★★★★★
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a customer
Lowell, US
★★★★★ 5
My dog loves these toys.
Size: Mini, Color: Gator (Pink)
Not a huge toy, nor is my dog. But we have lots of goDog toys. Practically indestructible and my dog likes to carry these in his mouth and bring them onto the foot of our bed. Brilliant colors and good squeaker but my dog is afraid of the squeak. Fair value for cost.
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Reviewed in the United States on June 10, 2026
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University Doc
Phoenix, US
★★★★★ 5
Our XL dogs love them. Highly recommend it!
Size: Mini, Color: Gator (Pink)
Our XL dogs love this! Highly recommend them! Highly recommend. Not for aggressive chewers but our big dogs don't destroy their toys. They cherish them. Great for play and cuddling. Not to loud either. Very cute.
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Reviewed in the United States on May 13, 2026
V
Verified Purchase
Valhalla49
Natrona Heights, US
★★★★★ 5
When they said strong...
...they weren't kidding. Our pup would chew through everything she could get her sharks teeth into. Like my arms. Nothing lasted as long as a week or maybe two. But she has had Dino for months now. She loves him. He is the go to toy for when she wants to play tug. The material used to make this toy is every bit as strong as the seller claims. I will definitely buy from them again. And I will not wait for this one to rip. I may be waiting a long time. If your pup likes to tear stuff apart, feel safe in buying this toy, UPDATE: 2/9/2023 Dino finally succumbed to the torture. His back ripped open and despite trying to repair him with ordinary thread he couldn't withstand the pressure, His stuffing was removed and spread all over the living room. Completely emptied he is still a good toy. Strong enough to withstand the forceful play of tug-o-war. Only thing I would suggest is to use something stronger when closing his back. The rest of him is great. I will be replacing him soon.
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Reviewed in the United States on January 30, 2023
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Verified Purchase
Rachel
New York, US
★★★★★ 4
Not so tough
Size: Mini, Color: Gator (Pink)
I bought this because I dog sit. The dog chews up every. Single. Toy. So I bought it since it was cheap and it can be in the “chunk” (the dog’s name) toy box. It is not durable at all. He tore it up just as fast as a cheaply made toy. Chunk LOVES it! He would not stop playing with it. He loves the squeakers, it is a perfect size for him to throw it up in the air and chase it, and he loved ripping the legs off. It is good for my husband and I because there is little to no fluff. However, it is the perfect size to drop behind the couch and not be able to get. So once he drops it behind the couch, he won’t get it until morning. Now for my dog’s rating. My dog loves this toy too. He is much more gentle with toys (he has $5 Walmart toys we bought him back in 2020 in perfect condition that he plays with them every day). Before Chunk came over for the weekend, my dog Ted played with this. Ted is a larger small dog and chunk is a smaller small dog. And it is still the perfect size for both dogs.
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Reviewed in the United States on April 26, 2026
S
Verified Purchase
Scott T
Belleville, US
★★★★★ 5
Tough
Size: Large, Color: Dinos Frills (Pink)
Tough dog toy that's held up through multiple washes! My dogs love the squeaker. They are not destructive chewers so I can't really say how it would hold up with that kind of dog though.
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Reviewed in the United States on June 8, 2026

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