SKU: 15308999848

Water Pump Impeller Kit - Fits Yamaha 4HP/5HP Outboard Motors (Replaces 6E0-W0078-A2-00)

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Description

Water Pump Impeller Kit - Fits Yamaha 4HP/5HP Outboard Motors (Replaces 6E0-W0078-A2-00)Water Pump Impeller Kit Fits Yamaha 4HP 5HP Outboard Motors (Replaces 6E0 W0078 A2 00) This water pump impeller repair kit provides the necessary components to service the lower unit water pump on Yamaha 2 stroke 4HP (19841999) and 5HP (19842002) models, as well as 4 stroke F4 (19992008) outboards. It is designed to meet OEM specifications for a reliable, direct fit replacement. This kit is a direct replacement for Yamaha part numbers 6E0 W0078 A2 00,

Water Pump Impeller Kit - Fits Yamaha 4HP/5HP Outboard Motors (Replaces 6E0-W0078-A2-00)

This water pump impeller repair kit provides the necessary components to service the lower unit water pump on Yamaha 2-stroke 4HP (1984–1999) and 5HP (1984–2002) models, as well as 4-stroke F4 (1999–2008) outboards. It is designed to meet OEM specifications for a reliable, direct-fit replacement.

This kit is a direct replacement for Yamaha part numbers 6E0-W0078-A2-00, 6E0-W0078-02-00, 6E0-W0078-01-00, 6E0-W0078-00-00, 6E0-W0078-A3-00, and aftermarket parts AM6E0-W0078-A2, HJ YHJB-6E0.

  • Engineered for a direct replacement installation.
  • Includes all core components for a complete water pump service, including the impeller, housing, gaskets, and plates.
  • Built with high-quality materials to ensure durability and reliable cooling performance.

Part Number Cross-Reference

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

Brand Part Number Superseded By
Yamaha 6E0-W0078-00-00 6E0-W0078-01-00
Yamaha 6E0-W0078-01-00 6E0-W0078-02-00
Yamaha 6E0-W0078-02-00 6E0-W0078-A2-00
Yamaha 6E0-W0078-A2-00 6E0-W0078-A3-00
Yamaha 6E0-W0078-A3-00
Aftermarket AM6E0-W0078-A2
Aftermarket HJ YHJB-6E0

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.

Confirm your engine model/year in the table below.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha 4A, 4AC, 4ACMH, 4CMH 4 2-Stroke 1984–1999 6E0-W0078-A2-00
Yamaha 4MLHU, 4MLHU2, 4MSHU, 4MSHU2 4 2-Stroke 1996 6E0-W0078-A2-00
Yamaha 5C, 5CM, 5CMH 5 2-Stroke 1984–2002 6E0-W0078-A2-00
Yamaha 5MLHU, 5MLHU2, 5MSHU, 5MSHU2 5 2-Stroke 1996 6E0-W0078-A2-00
Yamaha F4 4 4-Stroke 1999–2008 6E0-W0078-A2-00
Mariner 4A(6E0) 4 2-Stroke 6E0-W0078-A2-00 Models with Serial Number 6E0
Mariner 5C(6E3) 5 2-Stroke 6E0-W0078-A2-00 Models with Serial Number 6E3
Mariner 96325T, 96325M 4, 5 2-Stroke 6E0-W0078-A2-00 Only with Serial Number 6E0 & 6E3

Technical Specifications

Specification Value
Product Type Water Pump Impeller Kit
Installation Direct replacement
Other Technical Attributes High-quality materials designed to OEM specifications

Package Contents

  • 1 x Water Pump Housing (6E0-44311-00-00)
  • 1 x Water Pump Gasket (6E0-44315-A0-00)
  • 1 x Cartridge Insert (6E0-44322-02-00)
  • 1 x Cartridge Outer Plate (6E0-44323-00-00)
  • 1 x Impeller (6E0-44352-00-00)
  • 1 x Water Seal Damper 2 (6E0-44366-00-00)
  • 1 x Dowel Pin (93604-09066-00)
  • 4 x Bolt (97080-06045-00/97095-06045-00)

Explosion Diagram

Installation Guide

  1. Disconnect the battery and remove the engine cover.
  2. Drain the lower unit gear lube.
  3. Remove the bolts securing the lower unit and carefully separate it from the upper casing.
  4. Unbolt and remove the old water pump housing.
  5. Note the rotational direction of the old impeller vanes before removing it and its key.
  6. Thoroughly clean the mounting surfaces, removing any old gasket material or sealant.
  7. Install the new components in reverse order, starting with the new gasket, plate, impeller, and housing.
  8. When installing the new impeller, turn the driveshaft clockwise to bend the vanes into the correct orientation inside the pump cup.
  9. Secure the new water pump housing and torque the bolts to the manufacturer's recommended specification.
  10. Re-attach the lower unit, ensuring the water tube and driveshaft align correctly.
  11. Refill the gear lube with the recommended oil and reinstall the drain screws.
  12. Connect a water supply to the lower unit and start the engine to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?
A: Check your engine's model, horsepower, and year against the "Compatible Engine Models" table. For Yamaha, we recommend using the serial number guide linked above to be certain. This kit is for specific 4HP and 5HP models produced between 1984 and 2008.

Q: My Mariner has a 6E0 serial number. Will this fit?
A: Yes, this kit is designed for Mariner 4A models with a "6E0" serial number and 5C models with a "6E3" serial number. Always verify compatibility using your specific model information, as year ranges can vary.

Q: How often should I replace my water pump impeller?
A: For optimal performance and engine safety, we recommend inspecting the impeller annually and replacing the entire water pump kit every 2-3 years or 200-300 hours of use, whichever comes first, especially if operating in saltwater or sandy conditions.

Q: What are the signs of a failing water pump?
A: Common symptoms include a weak or non-existent water stream from the "telltale" outlet, engine overheating alarms, and a dry, cracked, or brittle impeller with a "set" vane direction upon inspection.

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:
  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: 15308999848

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4.5 ★★★★★
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Essell
Waukegan, US
★★★★★ 5
Most comfortable office chair this fluffy guy has ever sat in.
Color: Black, Style: Classic
This chair is incredibly comfortable—easily the most comfortable one I’ve ever sat in. At around 300lbs, I’ve struggled to find a chair that’s both supportive and spacious. Most options feel tight, with the armrests pressing into my hips. Not this one. If anything, I feel small in it—there’s plenty of room on either side. It’s like going from a cramped budget airline seat to first class on a full-service carrier. The lumbar support is the best I’ve ever used. The materials are top-notch—everything from the base to the legs to the casters is metal (feels like steel). The casters themselves use what look like inline skate wheels and glide effortlessly across carpet—almost too well on hard surfaces, so you might want to consider a rug. Not a flaw, just something to keep in mind. I’ve paid twice as much for chairs that felt half as good, so in my opinion, this is an excellent value. The faux leather looks great and the stitching appears durable. While it may not last as long as real leather or high-quality fabric, it should hold up for a reasonable amount of time. Tilt functionality is basic—just two settings: upright or slightly reclined. Honestly, that’s all I need. If you’re looking for something to nap in, this might not be the chair for you. But for office work or gaming, it absolutely delivers all-day comfort. For reference, I’m 5'8", and the headrest aligns perfectly with the back of my head. If you're 6'5", it might end up being more of a neck rest. And I have to give a special shoutout to the included T-shaped hex wrench. It may sound silly, but this alone earns it a 5-star review from me. Every other chair I’ve bought includes those awful angled hex wrenches that make you slam your knuckles into the frame with every turn—often accompanied by some colorful language. Sure, I have my own tools, but finding where my wife hid them isn't always easy. A good-quality tool in the box? That’s thoughtful and appreciated.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 19, 2025
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Verified Purchase
Martin
Phoenix, US
★★★★★ 5
Wide and comfortable office chair
Color: Black, Style: Classic, Color: Black, Style: Classic
It's made of very fine leather and in good quality. It has a pump to pump air to the back of the chair, so I can adjust the softness of the chair back. It's a very wide chair. Maybe the widest one I ever bought. I can only sit half of its space. It's very easy to install, the alignments are perfect. Its arm and height is adjustable. The wheels are advance ones which make it move through the floor smoothly. It looks an advance chair if you want an upgraded experience.
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Reviewed in the United States on April 14, 2026
S
Verified Purchase
shannda
Carnegie, US
★★★★★ 5
Comfortable Seating
Color: Black, Style: Classic
I honestly didn’t expect this chair to be this comfortable, but it has exceeded my expectations in every way. I sit at my desk for long hours every day, and the adjustable air-pump lumbar support has been a total game changer. I love that I can fine-tune the firmness depending on how my back feels that day. My lower back pain has noticeably improved since switching to this chair.The seat is wide, thick, and very supportive without feeling stiff, which makes long work sessions much more comfortable. The armrests are another big plus—they adjust in so many directions that I can always find the perfect position for typing, reading, or relaxing. The chair feels extremely sturdy and well built, and it gives me confidence knowing it supports higher weight without wobbling.Assembly was straightforward and took about 20 minutes. Overall, this chair feels premium, comfortable, and thoughtfully designed. I would absolutely recommend it to anyone looking for a reliable, all-day office chair.
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Reviewed in the United States on March 28, 2026
C
Verified Purchase
Cynthy
Boise, US
★★★★★ 5
Nice chair, w/ good cust support
Color: Black, Style: Classic
I apologize for length, but if I am doing a review for other people I assume you want to have as much info as possible to make a decision. I feel this chair is for tall/fat/both so will review it as such. At 6’4” @ 350lbs I fit into both, but reviewing based upon my body, yours is different so adjust according. TLDR – Would buy again, cavernous comfy chair with excellent customer support. Only personal dings against chair are the back could be taller, but added back due to support. Parts + Fit/Finish + Assembly: The parts have some heft and feel solid as expected for a chair designed for heavy people. Material and stitching look proper and I see no flaws. My box was beat to hell and ripped opened at one point. Packing material took the hit and did its job as the items were unaffected. The gas cylinder for the chair was missing and assume lost during shipping. (see customer service). Assembly was standard office chair fare with simple and clear instructions. Wheels / Height / Controls: I normally wouldn’t think of mentioning wheels, but it’s different than expected. They are good, maybe too good. A slight kick to push you back on wood floors sends you flying. The height adjustment for me is good/standard. At full height my feet are flat on the floor and where I would have the chair even if it went higher. My wife (5’6”) at that height is about 2.5 inches above the floor. Taller people than myself may wish for more height. Chair controls are standard fare and operate smoothly Seat: It’s large and with the arms is there is nothing even close to your hip/legs. I can put my fist on my hips and my arms barely touch the chair arms. This is why you are thinking of this chair, and for that you will not be disappointed. The seat is not pillow soft and IMHO a little firmer than I liked at first, but after a few days got broken in or I adjusted. I am a programmer + gamer so spend a lot of time in the chair for hours on end. Comfortable and no complaints at all. Seat depth for me is ~1” from my knee and good with roughly 20.5” usable butt/thigh length. That should be fine for big/tall but may be a bit much for big/short. Measure your current chair and decide from there. Back: The back lets the chair down a bit for me, the big/tall user, as the target seems to be big/short users. The back ends just below my shoulder-line. That obviously means no leaning my head back and the headrest is squarely on my shoulder blades. Not uncomfortable, but I’d prefer a taller back. For me personally I’d like it to be extended 4”, but that would likely be an issue for shorter users. I feel if the manufacturer increased the back by 2 inches it would be an ideal compromise for all users. The chair has an inflatable lumbar support, which I did not use as I personally find those uncomfortable. Also note the chair is designed for a more proper posture with a 90deg back and not a more relaxed 100-110deg. Neither pro/con as personal preference. Arms: The design of the arms being supported by rear only as mentioned earlier allow for an abundance of hip/thigh space. This is an excellent ergonomic design with a potential caveat. More stress will be placed upon the connection/joint. The joint for this chair is just shy of 4” so seems beefy but only time will tell if it holds up to the lateral force of leaning on it while reading. My chairs tend to last 5-7 years, due to the right arm feeling wobbly or the chair leaning to the right. The arm adjustments provide a nice front/back of ~3”, from touching chair back to 3” gap between chair/armrest. The height is similar and also moves the armrest forward about another 2”. At full forward/up the armrest are higher than I like so should easily accommodate taller users. Customer Service My chair was missing a part that I suspect was lost during shipping due to box condition. I contacted them Sun (7/20/2025 @ 1201). At 2228 that night I received a response that they acknowledged the issue and gave a tracking order for the missing part. The part arrived Mon 7/28 and gave a few days to test it out for review Fri (8/1). Obviously you don’t want an issue, but if an issue arises how a company handles it tells you a lot IMHO on how they feel about their product. I am very pleased with their handling of the matter.
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Reviewed in the United States on August 4, 2025
A
Verified Purchase
Amy
Waukegan, US
★★★★★ 5
Great Chair
Color: Black, Style: Classic
The durability, recline, noise, fit, and appearance, and stability of the chair were all fantastic. As someone of a shorter height, the backrest which is normally way to high or short for my head fits perfectly. The chair itself is easy to assemble and very comfortable to sit in for long hours. I tend do a lot of work at home and this chair feels very comfortable without feeling the need to get up. The chair looks great set up in my office and is honestly a great office chair. For moving around a room, the wheel guides across my carpet very smoothly with struggling unlike my previous chair which would need a heavy push. Not only that, the chair is noiseless which is a plus for people who get bothered by little sounds when moving around. The fit could honestly fit anyone of any size as the chair itself is quite wide and roomy for me. The seat is also made up of faux leather and feels well stitched and quite durable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026

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