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Description
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 6H3-W0078-02-00)Water Pump Impeller Repair Kit Fits Yamaha 40 60 HP Outboards (Replaces 6H3 W0078 02 00) This water pump repair kit is designed for Yamaha 2 Stroke 40 50 HP (1995 2009) and 4 Stroke 40 60 HP (1995 2009) outboard motors. It provides a reliable solution for maintaining your engine's cooling system for optimal performance and longevity. This kit is a direct replacement for Yamaha part numbers 6H3 W0078 02 00, 6H3 W0078 01 00, 63D W0078 01, and Sierra
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 6H3-W0078-02-00)
This water pump repair kit is designed for Yamaha 2-Stroke 40-50 HP (1995-2009) and 4-Stroke 40-60 HP (1995-2009) outboard motors. It provides a reliable solution for maintaining your engine's cooling system for optimal performance and longevity.
This kit is a direct replacement for Yamaha part numbers 6H3-W0078-02-00, 6H3-W0078-01-00, 63D-W0078-01, and Sierra part numbers 18-3434 and 18-3415.
- Includes a complete set of gaskets, plates, and a high-performance impeller for a full service.
- Engineered as a direct-fit replacement for the original components.
- Restores cooling system efficiency to prevent engine overheating.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6H3-W0078-02-00 |
| Yamaha | 6H3-W0078-01-00 |
| Yamaha | 63D-W0078-01 |
| Sierra | 18-3434 |
| Sierra | 18-3415 |
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 | Various | 40 | 2-Stroke | 1995-2005 | 6H3-W0078-02-00 | |
| Yamaha | Various | 50 | 2-Stroke | 1998-2009 | 6H3-W0078-02-00 | |
| Yamaha | Various | 40 | 4-Stroke | 1998 | 63D-W0078-01 | Alternative part |
| Yamaha | Various | 50 | 4-Stroke | 1995-2009 | 63D-W0078-01 | Alternative part |
| Yamaha | Various | 60 | 4-Stroke | 2002-2009 | 63D-W0078-01 | Alternative part |
| Yamaha | T50 | 50 | 4-Stroke | 2006+ | 6H3-W0078-02-00 | High Thrust model |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Repair Kit |
| Installation | Direct Replacement |
| Other Technical Attributes | Includes complete water pump service components |
Package Contents
- 1 x Cartridge Insert (663-44322-00-00)
- 1 x Impeller (6H3-44352-00-00)
- 1 x Water Pump Gasket 1 (6H3-44315-A0-00)
- 1 x Cartridge Outer Plate (6H3-44323-00-00)
- 1 x Cartridge Gasket (6H3-44324-A0-00)
- 1 x Water Pump Gasket 2 (688-44316-A0-00)
- 1 x O-Ring (93210-46044-00)
- 2 x Bolts, With Washer (90119-08M14-00)
- 2 x Bolts, With Washer (90119-08M33-00)
- 1 x Woodruff Key (90280-03M03-00)
Installation Guide
- Disconnect the battery and ensure the engine is securely turned off.
- Remove the lower unit (gearcase) from the outboard motor by unbolting it from the engine leg.
- Unbolt and carefully lift the old water pump housing off the driveshaft.
- Remove the old impeller, Woodruff key, wear plate, and gaskets. Take note of their orientation.
- Thoroughly clean all mating surfaces, ensuring no old gasket material or debris remains.
- Install the new gaskets, wear plate, and cartridge insert from the kit.
- Slide the new Woodruff key into the slot on the driveshaft.
- Install the new impeller, turning the driveshaft clockwise to help seat the vanes correctly inside the housing.
- Place the new outer plate and gasket over the impeller.
- Secure the pump housing with the new bolts provided, tightening them to the manufacturer's specified torque.
- Reinstall the lower unit onto the outboard, ensuring the driveshaft and water tube align correctly.
- Reconnect the battery and test the engine using a water supply (flushing muffs) to confirm proper water flow from the telltale outlet.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my specific Yamaha engine model?
A: Check your engine's model, horsepower, and year against our compatibility table. For precise verification, consult the Yamaha Serial Number Guide linked above or cross-reference your existing part number with our list. This ensures you order the correct component for a successful repair.
Q: What are the signs of a failing water pump impeller?
A: The most common signs include the engine overheating, a weak or non-existent water stream from the "telltale" indicator, or a burnt rubber smell. Upon inspection, a failing impeller may appear brittle, cracked, or have missing vanes.
Q: How often should the water pump impeller be replaced?
A: As a crucial part of preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 years or 100-200 hours of use. Frequent operation in saltwater or sandy/silty conditions may require more frequent replacement.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.2 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 1
Don’t buy
Set name: K2 SE Combo, Set name: K2 SE Combo
This printer is pretty awesome. Here is the biggest catch to it. We have spent hundreds of dollars on the app and or validating what we could buy between buying filament and everything else. This thing does not connect properly. It is very technical if you are not smart. This is a terrible thing to buy. I’m a very educated person and so are the other 3 to 4 people in my household that have all tried to use this thing it will not let you change individuals to print off it and even the amount of money you spend to buy credit credits and or other items that you want to purchase in the store do not print properly. This sucks don’t buy it even though this equipment is awesome. This is the worst thing I wish I’d never bought. I do not say this in the test and or ignorance I have studied. I have read up. I’ve looked at forums. I’ve been on Reddit. Everyone says this creatality is extremely difficult and we have definitely found this out firsthand. I would definitely return this, but I think my window has closed. It sucks when you buy a product and you have it for like 2 to 3 weeks before you get to use it but then your window to return it is closed. The app does not match what is online and or if you have more than one person that wants to print, you cannot share unless the other person is logged out and even if the person is logged out, it does not always match the same, so for example, I have tons of money and credit on my account, but it will not let me print out certain apps and or creations then it tells me that it will work on our item that we have purchased, but then it’ll say it does not work. It will not print. 3-D printer is a scam. It sucks. It has great potential but this is not the one for you. Don’t waste your money too much money.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Forget Adventurer 5M , This is the true and easy to use beginner machine
Set name: Ender 3 V3 SE
This is my 3rd 3d printer. Once I spent about 45 minutes assembling it has been printing nonstop since the amazon driver dropped it off, these are the best for reliability and perfect for hobbyists. It is not the quickest machine out there, but it makes up for it with a quality print good price as well.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
One - Month Review
Set name: Ender 3 V3 SE, Set name: Ender 3 V3 SE
First - I wrote a out of the box review - I do not know if this review will replace the old review or compliment it. Just in case this review replaces the old review - I will repeat a few of the important points from the previous review.
I must also say it helps a great deal if you are already familiar with Ender because about 80% or more of the machine is built the same way as the older models. If this is your first Ender - read the instructions and check to make sure you have all the parts. Placing the parts where you can easily tear open the bags and not having to search for a part cuts down the assembly time. While the assembled printer takes up a small footprint - give yourself room to work.
This is my 3rd printer - my first one I made from scratch. It took about 2 weeks to get it assembled and another two weeks to get it to print properly. Most of that time was spent modifying the Martin software so it would run my machine!
My second one was an Ender V1. It took me about 90 minutes to assemble and about 30 minutes to get it to work. Over the years - I modified it to the point it was virtually impossible to tell the difference between it and a V3. I replaced it because a least one of the motors was going bad and I did not want to do the repairs.
I picked this printer for 3 reasons 1) it was on sale, 2) I am now wheelchair bound and needed a printer that did not require too much assembly, and 3) I had worked with Ender before and knew how they worked. I was able to keep some of the old parts from the old machine (but threw most away).
Everything was packaged well, but the small parts are in plastic bags that you have to tear or cut open - so be careful you do not lose any parts! There are only three parts to be assembled. They are the base, the frame, and the screen. I had no trouble getting the machine together - did have some trouble getting it to work. I was never able to reach customer service which ranged between "Who are you Kidding?" and "Did you really expect any?"
I did some internet searching (there is lots of stuff out there - many are good YouTube videos). I found I needed to do an update - it got a bit complicated here. Part of the update was done using the hidden slot on the LEFT side of the removable screen and part was done using a SD card on the LEFT side of the Unit. (Ender does NOT tell you this on their website!). I was already angry when I tried their slicer and it did NOT work - after not being able to get customer service again. I deleted their slicer and used my Cura. After doing a few prints using Cura (which works fine) a couple days later, I reinstalled their slicer and did some troubleshooting - I found I had a setting wrong. I use both Cura and their slicer now because of the differences. Each one has some features the other one lacks.
One example: The Cura has a large number of preset configurations, and it is easy to save a custom configuration.
The Creality titles the g-code with a filename that includes the estimate print time.
I tried customer service and actually someone! They did give me the manual settings for generic Pla - when I asked how to save those settings they send me to a useless link. I will research how to save one day - but will use my Cura for generic pla until then.
What I like about the machine.
1} While it is nosier (a trade-off for higher speed) - it is still much quieter than the original Ender I had before modifications.
2)The new ribbon and print head are a big improvement. The filament is easier to change, and you can easily make prints with different colors! I do not miss the bowden tube and individual wires at all!
3) I like to put my prints on a card. The old machine used a micro-SD card - and I quicky bought an adapter! The new machine takes regular SD cards and no adapter is needed!
4) I really like the automatic leveling feature. There have been times I have spent hours getting my manual table set the way I wanted. So far - it has worked great. I have only made about 50 prints - so I cannot tell you how reliable it is in long term use.
5) The quality of prints is much better than my old machine. I am not sure whether this due to being a better machine or the stepper motor needing replacement.
What I do not like:
1) The SD card has to be put into its slot upside down.
2) The controls and the SD card slot are all on the left side of the printer. I think putting the computer connection and the SD card would have been much better on the front of the machine.
3) Updating is like putting up a Christmas tree. The firmware is done with a hidden C connector on the left side of the detachable screen (this is like putting up a Christmas tree). Fine details on display etc. are put in using the SD card (this is like putting the lights on the tree). Once you figure out what goes where - it is the easiest printer to update I have had.
4. This one is a mixed bag. I do not give their customer service good marks - but the fact I found solutions on the internet was a good thing.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
The K2 SE is a great entry level printer. Don't let the naysayers get you down!
Set name: K2 SE
I bought the K2 SE because it was inexpensive and I wanted to get into 3D printing. I had a Creality laser engraver that worked well, so I figured I'd go with the brand I knew. I bought the additional enclosure because I was planning to use this in the garage where my wood shop is, and I wanted to keep some dust out.
I have been pushing this thing pretty hard for three months now and it has not so much as looked at me cross eyed. It takes everything I throw at it. The quality seems to be there, as nothing is wearing out. I have a little superlube oil and grease to keep up the maintenance, and I suspect any failures people report have been on unmaintained machines. If you're the type that drives your car without changing the oil, 3D printing is not for you.
A quick note on 3D printing, for the uninitiated. When you see the one and two star reviews for the K2 SE, make sure you read why the reviewer is leaving the low rating. "Doesn't come with filament" - if you're not buying a combo with filament, none of the printers on the market come with filament. "Makes bubbles and pops when printing" - this is wet filament and not the fault of the printer (dry your filament). 3D printing is not a set it and forget it proposition, at least not at first. It requires a little skill (that can be built), a little knowledge (the U of Tube), and a little patience while you learn how to use the machine.
Now for the machine itself...
The print quality surprised me as a first time 3D printer user. I have purchased 3D printed items in the past and the lines were not something that impressed me. The K2 SE prints pretty much the same quality as the higher end Bambu Labs printers. The speed is all I could ask for, and I have fed this thing all kinds of PLA, PETG and TPU from Creality, Sunlu, Polymaker and AnyCubic without a problem. Any issues I have had have been the fault of the operator (me) not knowing I had to dry PETG before I use it. I have a Creality filament dryer now and dry my PETG right out of the package, then store it in an airtight container with dessicant. I have two printers running dried PETG sitting behind me right now and they're doing great.
If I have a single complaint about the K2 SE, it's the bed size. At 215 x 220 it's smaller than the industry "standard" of 256 x 256, and if you get some of the larger prints that are designed for a "standard" sized printer, they won't fit the build plate. But I knew that coming into this, because they advertise the size right up front.
Overall, I'm happy with the K2 SE. It was an excellent entry level printer and I have learned a lot from using it. I may even buy a second to add to my growing farm.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Creality K1 SE - Prints great with stock settings - needs a side spool mount
Set name: K2 SE, Set name: K2 SE
I bought the Creality K1 SE a little over a week ago. I had an Ender 3 S1 before this printer. The K1 SE is so, so much easier to print with right out of the box! I definitely recommend it. It's a good way to get the improvements that were built into Creality's K1C, but at a nicer price. Plus, you can install your own version of Klipper if you want.
I've printed 10 or so things in PLA and PETG, and I haven't had any failed prints. The automatic bed leveling has just worked. I have not had any problems with bed adhesion. On the Ender 3 S1, I only used a textured PEI plate, but the smooth build plate on the K1 SE works fine. The extruder cooling fan also seems ok for what I've printed so far. I printed an overhang test and the 75 degree overhang looks fine, but it had trouble at 80 degrees. The bridging test looked ok. (The longest bridge was only 25 mm on that test however.)
I've put the printer in a soft-sided enclosure that I had used for my old Ender 3 S1. (It's easy to find similar encolsures.) The LEDs on the K1 SE are bright enough to see inside which is something that I was concerned about before I purchased. However, this enclosure makes it difficult to access the back of the printer where the filament spool is mounted, so I designed a mount that clamps onto the side-bar - see the pictures. The files are on Printables - "Creality K1 SE Side Spool Mount".
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Reviewed in the United States on January 21, 2025