SKU: 51340501530

679-W0078-A0 Water Pump Impeller Kit for Yamaha OMC C40 235 240 | JLM Marine

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Description

679-W0078-A0 Water Pump Impeller Kit for Yamaha OMC C40 235 240 | JLM MarineWater Pump Impeller Kit Fits Yamaha 2 Stroke 40 HP C40 & OMC Cobra Stern Drive 235 240 This water pump impeller kit is engineered for Yamaha 2 Stroke 40 HP C40 outboards (19901997) and OMC Cobra Stern Drive models 235 (1971, 19751977) and 240 (1978). It provides a direct replacement solution for critical cooling system components, ensuring reliable water flow and consistent engine temperature regulation. This kit directly replaces Yamaha part numbers

Water Pump Impeller Kit – Fits Yamaha 2-Stroke 40 HP C40 & OMC Cobra Stern Drive 235/240

This water pump impeller kit is engineered for Yamaha 2-Stroke 40 HP C40 outboards (1990–1997) and OMC Cobra Stern Drive models 235 (1971, 1975–1977) and 240 (1978). It provides a direct replacement solution for critical cooling system components, ensuring reliable water flow and consistent engine temperature regulation.

This kit directly replaces Yamaha part numbers 6F5-44352-00, 6F5-44352-A0, 679-W0078-00, 679-W0078-A0 and Sierra Marine 18-3374, 18-3397, 18-3398. All components are designed to meet OEM specifications for precise fitment and performance.

  • Complete kit includes impeller, key, gaskets, and seal for a comprehensive rebuild
  • Compatible with both Yamaha outboard and OMC stern drive applications
  • Designed for saltwater and freshwater cooling systems

Part Number Cross-Reference

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

Brand Part Number
Yamaha 6F5-44352-00
Yamaha 6F5-44352-A0
Yamaha 679-W0078-00
Yamaha 679-W0078-A0
Sierra Marine 18-3374
Sierra Marine 18-3397
Sierra Marine 18-3398

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
Yamaha C40 40 HP 2-Stroke 1990–1991
Yamaha C40 40 HP 2-Stroke 1992–1997
OMC Cobra Stern Drive 235 235 - 1971
OMC Cobra Stern Drive 235 235 - 1975–1977
OMC Cobra Stern Drive 240 240 - 1978

Technical Specifications

Specification Value
OEM Number 679-W0078-A0
Application Water Pump Rebuild
Compatible Brands Yamaha, OMC
Kit Type Complete Impeller Kit

Package Contents

This complete water pump impeller kit includes the following components:

  • 1 × Water Pump Impeller (6F5-44352-00, 676-44352-00)
  • 1 × Key, Impeller (90280-04M00-00)
  • 1 × Gasket, Water Pump (676-44315-A0-00)
  • 1 × Gasket, Water Pump (676-44324-A0-00)
  • 1 × Gasket, Water Pump (679-44316-A0-00)
  • 1 × Seal, Water (663-44366-00-00)

Installation Guide

  1. Disconnect the fuel line and remove the lower unit from the outboard or stern drive following manufacturer service manual procedures.
  2. Remove the water pump housing cover and old impeller. Inspect the housing for wear, scoring, or corrosion.
  3. Clean all gasket surfaces thoroughly using a gasket scraper and solvent to ensure a proper seal.
  4. Install the new impeller key into the driveshaft slot, ensuring it is seated firmly.
  5. Lubricate the new impeller with marine-grade grease or glycerin. Insert it onto the driveshaft, aligning the key slot.
  6. Rotate the impeller blades in the direction of normal rotation to ensure they are correctly oriented.
  7. Install the new gaskets in the correct order as specified in your service manual, applying a thin layer of marine sealant if recommended.
  8. Reinstall the water pump housing, ensuring all fasteners are tightened to the manufacturer's specified torque values.
  9. Reattach the lower unit to the outboard or stern drive, reconnect the fuel line, and check for proper alignment.
  10. Submerge the lower unit in water or connect a flushing device. Start the engine and verify strong water flow from the cooling system tell-tale.
  11. Allow the engine to reach operating temperature and inspect all seals and gaskets for leaks.
  12. If leaks or weak water flow are detected, shut down immediately and re-inspect the installation.

Troubleshooting & FAQ

Q: How do I confirm this impeller kit fits my engine?
A: Verify your engine model and year against the compatibility table above. Cross-reference your existing part numbers (found on the old impeller or in your service manual) with the part number cross-reference table to confirm fitment.

Q: How often should I replace the water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2–3 years or 200–300 hours of operation, whichever comes first. If you operate in sandy or debris-filled water, inspect and replace more frequently.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include weak or no water flow from the tell-tale, engine overheating, reduced power, steam from the engine, or visible impeller damage such as cracked, broken, or glazed blades.

Q: Can I reuse the old gaskets and seals?
A: No. Always replace all gaskets and seals during a water pump rebuild to prevent leaks and ensure proper cooling system pressure and performance.

Q: What is the difference between OEM and aftermarket impeller kits?
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.
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: 51340501530

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4.2 ★★★★★
Based on 26 reviews
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Product Reviews
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Verified Purchase
Nirpno
Omaha, US
★★★★★ 2
NOT Indestructible and a Nylon Product (NOT A CHEW TOY)
Color: Green, Color: Green
I gave this dog toy 2-stars based on my dog toy rating system (DTRS) for “Bruce” the Green Alligator! Unfortunately, I didn’t notice in the fine print of the product description on the website that this toy consisted of Nylon. If I noticed that description, I would’ve never purchased this product. Please do your own research on Nylon wrt teeth. I wasn’t impressed with the toy construction out of the box. The nylon head and tail sandwich the rubber body with soft rubber spines on Bruce’s back for easy gripping. This is not an “Indestructible” dog toy. Safety (1-rating): 1. I was always concerned about my dog’s teeth possibly cracking while he was chewing on Bruce’s Nylon ends. Thankfully, his teeth were fine throughout the use of this toy. 2. The Nylon came off in small pieces after a few hours and continued for the life of the toy; see picture. I never intended for my dog to swallow pieces of Nylon. 3. Bruce’s rubber rear end is where most of the damage occurred, as my dog was tearing off pieces of rubber and spines, which he thankfully passed through his system over a period of 2-3 days after I threw Bruce away; see picture. 4. The chewed-up Nylon ends were very hard, rough, sharp and pointy. There were occasions where I noticed my dog’s gums were bleeding as a result of chewing this toy. 5. Bruce is big enough not to swallow in its entirety, which is why I’m giving this a 1-rating for safety. 6. This is a molded product and not a plush product. Durability (2-rating): 1. It took my dog 1 to 2-weeks to get the toy in the shape that is shown on the posted photos. 2. The Nylon was immediately being scratched and scraped apart on day-1. Then I noticed pieces of Nylon coming off of Bruce after 3-4 days. 3. The rubber was immediately being punctured with small divots around the body on day-1. I noticed over the next couple of days that my dog was focusing on the rear end and trying to pull the rubber off the Nylon tail. 4. The rubber started coming off more quickly after 1-week, until I removed it all together. Squeaker (N/A): 1. Bruce has no squeaker. Fatality (2-rating): 1. Bruce had a longer life than most of my dog’s toys, but then again, I expected this to last much longer as the seller claims it is “Indestructible”, which it is not. 2. I tried filing off some of Bruce’s chewed up Nylon ends to smooth them out for more chew time, but came to my senses and just threw him away for safety concerns only. In conclusion, “Bruce” the Green Alligator should not be given as a chew toy, but more as a fetch toy, unless you want your dog to digest the Nylon and rubber materials. Days of Enjoyment Given to Dog: 12/16/2024 Dog Toy Death: 01/08/2025 Total Days Used: 13 days (11 days spent away from home during the holidays) About my dog “Cannoli” for comparison Breed: Blue Healer / Lab mix Sex: Male Age: 8-months Weight: 45-lbs Size: Medium Energy Level: High Chew Rating: Aggressive
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 26, 2025
L
Verified Purchase
Lgiff
Belleville, US
★★★★★ 5
This has been a challenge for my extreme chewer! The toy is winning
Color: Green
Indestructible? Not for my pitbull. Except on this toy. She has slowly chewed some of the outer portion on the backside, but it still has a lot of gnawing time left. This is her go-to toy now. she carries it nearly everywhere. She loves it. I am amazed at how well it is holding up. Within minutes, hours or a few days, the other "indestructible" toys I've purchased, never survived as described. This is a heavy toy! Not for the weak! I cannot stress enough the extreme chewer my dog is. Yet, I can see this toy lasting months. It won't be pretty then but it will most likely still be a favorite chew toy. I'm glad I found this and will be buying more. FYI's... 1) Chewability-5 stars 2) Softness-1 star, it's solid but chewable, 3) Bounce-0 stars, No bounce, it's heavy!, Playability- 5 stars. My dog plays with it, lets it lay with her when resting. Nearly always within her reach. She sleeps with it! That's love.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 2, 2026
M
Verified Purchase
Michele Johnson
Massapequa, US
★★★★★ 5
My buddy has been chewing on this for an hour!
Color: Green, Color: Green
This dog toy has been a great addition to our dog’s toy collection! My dog can be a pretty aggressive chewer, so I’m always looking for toys that are durable and can actually hold up to daily play. This one has been surprisingly tough and has lasted much longer than many other toys we’ve tried. The material feels strong and well made, and the design makes it easy for my dog to grip and chew. He loves carrying it around and tossing it during playtime. It’s also great for keeping him busy and helping reduce boredom, especially when he has extra energy to burn. Another thing I like is the texture of the toy. It seems to help keep my dog engaged, and it’s sturdy enough that I don’t worry about it falling apart right away like some softer toys do. It’s been used for chewing, tugging, and even some fetch around the house, and it’s still holding up really well. The only small drawback is that I wish it had a squeaker inside. My dog absolutely loves squeaky toys, and I think that would make it even more exciting and keep him interested for longer periods of time. Overall though, this is a very solid and durable dog toy that’s perfect for dogs that love to chew. If you’re looking for something tough that can help keep your dog entertained and reduce boredom, this is definitely worth try
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2026
E
Verified Purchase
Elizabeth Funderburg
Boise, US
★★★★★ 5
Great Toy For Aggressive Chewers
Color: Green, Color: Green
My Boy loves it! It is a little heavy but it keeps him busy. Very strong and sturdy for aggressive chewing. We named it Ally the Alligator. He loves it definitely would recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
L
Verified Purchase
Larry
Phoenix, US
★★★★★ 4
Quality material and looks good.
Color: Green
Great chew toy for medium to large dogs. Seems to hold up to their chewing. Very heavy and could damage floors or furniture if your dog happens to throw it in the air.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026

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