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Description
Water Pump Repair Kit – Fits Yamaha F300/F350 Outboard Motors (Replaces 6AW-W0078-00)Water Pump Repair Kit Fits Yamaha F300 F350 Outboard Motors (Replaces 6AW W0078 00) This water pump repair kit provides all necessary components to restore the cooling system on Yamaha 4 Stroke V8 outboard motors. It is designed for F300, F350, LF300, and LF350 models manufactured between 2007 and 2011. This kit is a direct replacement for Yamaha part numbers 6AW W0078 00 and 6AW W0078 00 00, as well as Sierra aftermarket part number 18 3477.
Water Pump Repair Kit – Fits Yamaha F300/F350 Outboard Motors (Replaces 6AW-W0078-00)
This water pump repair kit provides all necessary components to restore the cooling system on Yamaha 4-Stroke V8 outboard motors. It is designed for F300, F350, LF300, and LF350 models manufactured between 2007 and 2011.
This kit is a direct replacement for Yamaha part numbers 6AW-W0078-00 and 6AW-W0078-00-00, as well as Sierra aftermarket part number 18-3477.
- Installation Type: OEM factory direct replacement.
- Core Components: Includes the impeller, gaskets, cartridge insert, outer plate, o-rings, and hardware.
- Housing Requirement: Designed for use with water pump housing 6AW-44311-01-00, which is sold separately.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6AW-W0078-00 |
| Yamaha | 6AW-W0078-00-00 |
| Sierra | 18-3477 |
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 | F300 | 300 | 4-Stroke | 2007-2011 | 6AW-W0078-00 | V8 Engine |
| Yamaha | LF300 | 300 | 4-Stroke | 2007-2011 | 6AW-W0078-00 | Counter-Rotation V8 |
| Yamaha | F350 | 350 | 4-Stroke | 2007-2011 | 6AW-W0078-00 | V8 Engine |
| Yamaha | FL350 | 350 | 4-Stroke | 2007-2011 | 6AW-W0078-00 | Counter-Rotation V8 |
| Yamaha | LF350 | 350 | 4-Stroke | 2007-2011 | 6AW-W0078-00 | Counter-Rotation V8 |
| Yamaha | F350TUR | 350 | 4-Stroke | 2010-2011 | 6AW-W0078-00 | V8 Engine |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Repair Kit |
| Installation | OEM Factory Direct Replacement |
| Other Technical Attributes | For use with water pump housing 6AW-44311-01-00 (sold separately) |
Package Contents
- 1 x Gasket, Water Pump (6AW-44315-00-00)
- 1 x Insert, Cartridge (6AW-44322-00-00)
- 1 x Outer Plate, Cartridge (6AW-44323-00-00)
- 1 x Key (6AW-44336-00-00)
- 1 x Impeller (6AW-44352-00-00)
- 4 x Bolt, With Washer (90119-08M14-00)
- 1 x O-Ring (93210-37M67-00)
- 1 x O-Ring (93210-94003-00)
- 2 x Pin, Dowel (93606-12019-00)
Note: This kit repairs the water pump but does not include the pump housing (part # 6AW-44311-01-00), which must be purchased separately if needed.
Installation Guide
- Safety First: Disconnect the battery and ensure the engine is securely positioned before starting.
- Remove Lower Unit: Drain the gearcase oil, then unbolt and carefully remove the lower unit (gearcase) from the outboard motor.
- Access the Pump: Locate and unbolt the water pump housing, which sits on top of the gearcase.
- Disassemble: Remove the old housing, impeller, wear plate, gaskets, and O-rings. Note the orientation of the impeller vanes.
- Clean Surfaces: Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
- Install New Components: Place the new gasket and cartridge plate. Insert the new impeller into the housing, rotating it in the correct direction to bend the vanes properly.
- Reassemble Pump: Install the new O-rings and dowel pins. Securely bolt the housing back onto the gearcase, tightening bolts to the manufacturer's torque specifications.
- Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft and water tube align correctly. Bolt it securely.
- Final Checks: Refill the gearcase with fresh oil. Reconnect the battery and start the engine on a water supply to verify a strong, steady stream from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my specific engine? A: Please use the "Compatible Engine Models" table above. Cross-reference your outboard's model, horsepower, and year to ensure it is listed. Verifying the OEM part number (6AW-W0078-00) against your engine's service manual is the most reliable method.
Q: Do I need to buy the water pump housing separately? A: Yes. This kit includes all the internal components like the impeller, gaskets, and plates, but it is designed for use with the existing water pump housing (6AW-44311-01-00). If your housing is cracked, warped, or heavily corroded, you must purchase it separately.
Q: What are the signs of a failing water pump? A: Common symptoms include the engine overheating at idle or low speeds, an alarm sounding, or a weak or non-existent water stream from the "tell-tale" outlet. Reduced engine performance can also be a sign of poor cooling.
Q: How often should I replace the water pump impeller and kit? A: For preventative maintenance, it is recommended to replace the water pump impeller and related seals every 1 to 2 years, or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
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
4.5 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Good, inexpensive espresso machine but NEED TO READ THE INSTRUCTIONS BEFORE USING.
Color: Silver, Color: Silver
I have no financial benefit from this review. After reading negative/positive reviews for this Neretva Espresso Coffee Machine - 1/2 Cups/Frother, I decided to purchase. Although I've only had it since 8/27/25 (writing this review 8/31), I am convinced the bad reviews are because the buyers didn't read the instructions. This was obvious to me because of complaints about the "error messages" and water exiting the steam wand. I was not familiar with espresso machines, and am new at wanting to learn how to brew espresso and other coffee beverages, so had to also look at You Tube videos after reading the instruction booklet that comes with the machine. After experimenting since the machine was delivered, today I was able to make a Flat White. I had several failures using the frother/steam wand. So, there was a learning curve for me. Although I have only been using this machine for 5 days, I am very pleased with my purchase and recommend for anyone who doesn't want to spend more than $100. I would give the warming tray a "D", but everything else an "A". Instead of the warming tray, I pour boiling water in my cup (and empty prior to brewing the espresso), while I'm getting everything ready. The suction cups are very strong, so I decided to put the machine on a small, hard placemat, as it's much easier to move the placemat around than to unstick the suction cups from the counter top to move it around. Also, I needed to purchase a metal pitcher to steam/froth the milk per You Tube videos. Because this is an inexpensive machine and because Neretva does not have a brick/mortar I can call directly, I purchased a 4-yr. warranty.
I learned through the internet Neretva has been around since 2008, but it's a global, e-commerce, brand that manufactures and sells a range of small, electric kitchen appliances, mainly through Amazon and Walmart, to consumers who want convenient, affordable appliances for making coffee, bread and a few other foods at home. I have no clue as a consumer how to contact them; hence, the warranty.
9/10/25 Update: I still recommend this espresso machine, but wanted to offer a tip due to what happened to me this morning making my daily espresso. I set everything up to just plug in the machine and press the button before I left for about an hour to do my daily laps in the pool. When I came home, I plugged in the machine and pressed the power button while I took a quick shower. Ten minutes later I was ready for my espresso so pushed the 2 shot button, waited and during what I call the countdown, nothing happened. I did this again, and no espresso came out. Reviewed the Trouble Shooting page. Quickly I realized that the water tank was empty, went through the process again with a full water tank, but the machine did not produce any espresso. Then I removed the Portafilter (which was in correctly) and saw a few coffee grounds on the rim of the Portsfilter (which I hadn't noticed when I got everything ready). I thought "Surely a few grounds wouldn't prevent the machine from working?", but I brushed off the grounds with a very small paint brush I use for this purpose, put the Portafilter into position and VOILA, got my cup of espresso. One might not want a machine that is so sensitive. Okay; I get it. Then spend more money. For me, I'd rather discover the quirks. Just thought this info might be helpful.
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Reviewed in the United States on August 31, 2025
★★★★★ 5
Affordable and reliable!
Color: Silver
This is an awesome Espresso machine!!!! Small footprint, and frothing has no match!!! I really enjoy making coffee with it and I strongly recommend it.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Very impressed, perfect shot of espresso with exceptional creme, compact, excellent value.
Color: A-Silver, Color: A-Silver
I am **very** impressed with this sleek, espresso machine. The Casabrews 5418 PRO is phenomenal and such a great value.
The pros and cons are very well set out by Neo Pam in her review of December 8, 2025.
The machine heats up almost instantaneously and brews a perfect shot and double shot of espresso. It is very easy to use and clean and the instructions are helpful. I really like the compact size.
Note that I drink almost exclusively espresso so I make no comment on the steamer other than to say I tested it and it produces copious amounts of very hot steam. Be careful in pushing the wand back--it gets very hot.
This was a great purchase and I enjoy it every morning!!
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Fast and Easy! Great Taste!
Color: A-Silver
This is my first espresso machine. The first thing you should know is to select the right beans -- especially if you choose the bottomless portafilter (optional, but recommended.) I bought a bag of Starbucks non-espresso dark roast beans, and it couldn't get to the espresso pressure in the bottomless filter; those beans are too oily for espresso. Their dark roast espresso beans work great, though.
Here's why this is the best Casabrews machine (in my opinion.) The "Flash heat" tech is ready to brew FIVE SECONDS after hitting the power button (feels more like 3.) There are machines that take anywhere from 30 seconds to about 20 minutes to heat up. I don't know about you, but I don't like waiting. This same tech is ready to froth milk 5 seconds after brewing. You can't froth at the same time, but you're already potentially on your daily limit of caffeine while your "friends" are still waiting for their clunky machines with double boilers to warm up..!
I've used mine daily since late November. If you have hard water, you will have to descale more often (I've done it once so far.) In my case, I use a Kangen filter on the 11.5 (alkaline) setting. This causes faster buildup, but the taste is worth it, and I've always used 11.5 pH for all coffee--drip and Keurig.
I use 17.5g of those Starbucks beans -- different beans may require different amounts. If you overfill the basket, you will get more steam and dripping. If you underfill it, you won't hit espresso pressure and it will taste weak and sour due to underextraction. I prefer tending toward overextraction. This could cause some bitterness, but that's easily-fixed by adding a few pinches of salt (I use Himalayan Sea Salt) or some almond milk. The punch and complexity are worth it, though -- it's the SOUL of the beans! ⚡😍🤩💪🏼
I've also used preground espresso, but it won't be quite as strong. That works fine with the pressurized double basket that comes with this machine -- but it won't reach pressure with the bottomless basket. The long-ground grains have lost their potency. I drink this if it's already early evening or later--so I could actually SLEEP!
Two things you'll want to get right away are a WDT tool (a bunch of needles like a long comb) and a "knock box" (where you tap the filter to remove the leftover coffee puck.) I 3D-printed a knockbox from Thingiverse.com Make sure you select enough infill and 4 walls because it'll have to take a lot of abuse. It also helps to have a dosing funnel (also 3D-printed from there.) Any concerns about food grade stuff is addressed by either buying PET-G food grade filament or wet-sanding (which I opted for.) The WDT tool breaks up the coffee clumps, and you'll want to stir it down and into the arcs of the filter to prevent sputtering, uneven flow, and bad espresso.
I also have a 3D-printed distributor--but many consider it unnecessary. I like it because it helps to center the grinds and then I tamp it down (I got an aftermarket tamper--one that has ridges; it works better than the flat ones.) I have a flat metal tamper, too. I just don't use it.
Making a double takes about 5 minutes--starting from grinding beans, weighing, transferring, stirring, tamping, putting on the included puck screen and attaching the portafilter. After that, you just press the button. I always get 3 streams that consolidate into one, and good crema (a bit of foam.) I use a digital Etek scale (~ $10.)
On scale use... My Etek can measure volume. But there are TWO settings. One is for milk (slightly different density) and one is for water. The one for water is approximately the same as the gram unit setting--as water is 1 gram per milliliter. Make sure if you are leaving it on the milliliter setting that you are using the water one. It has a drop icon. The milk setting has a cup with an "M" on it. You will put too much coffee in if you try to measure it with the milk setting. I found that out recently, as I was not aware of the separate setting for milk. So LIVE and LEARN! 🤓📈📊
If the machine gets accumulated mineral deposits, I take a straightened paper clip and carefully (VERY) insert into the hole in the mounting plate. I then run 2-3 doubles without the portafilter. If it gets more far-gone, I use citric acid (1 tablespoon per liter of water.) You could buy some descaling powder from a dollar store, but I think citric acid is more economical. I use it on my Kangen machine which is why I had it. You will then want to run a few cycles of doubles through to get rid of any aftertaste. You might be tempted to use vinegar and water. I used that on my Keurig and I had to run probably 6 or more cycles to get the vinegar taste out; I don't recommend it!
Make sure you run some hot water through the frothing tube after each use -- and wipe it down to remove the milk before it gets too solidified. This is done by turning the dial all the way back to the left, having the machine on, and then turning it all the way to the right. After you see the flow is constant (not sputtering or uneven--I watch for about 5 seconds), turn the dial back to the far-left.
That's it! This machine has changed my morning routine. I eat grits and a fried egg with it so I don't bounce off into the stratosphere on a caffeine high. The taste is quite good. I very rarely drink drip coffee (or even use it or the Keurig for coffee) since having this resource.
Being away from home is hard, because it's hard to find good espresso -- especially at those licensed "Starbucks." Those are the ones that just pay to use their materials, but are not the genuine deal.
Let me know how yours works out, how it tastes, and if you have any questions! 💯
Note: I made the video before I started using other tools mentioned, above.
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Reviewed in the United States on April 15, 2026
★★★★★ 5
A must buy for espresso lovers and limited counterspace
Color: Black
If you want an espresso machine but don’t want to go though the entire massive machines this is the perfect beginning and even moderate espresso maker for you! So much you can do with it, makes a great solid shot of espresso. No concerns so far and fast and easy to learn steps. Recommending this to all our friends and family that are interested
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Reviewed in the United States on April 14, 2026