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Description
Water Pump Repair Kit – Fits Mercury/Mariner 25-50 HP Outboards (Replaces 821354A2, 821354A1, 821354A04)Water Pump Repair Kit Fits Mercury Mariner 25 50 HP Outboards (Replaces 821354A2, 821354A1, 821354A04) This water pump repair kit provides the necessary components to service and restore the cooling system on select Mercury, Mariner, and Force outboard engines. It is designed to fit 25 50 HP 2 stroke and 4 stroke outboards from 19952018 and 40 50 HP Force outboards from 19951999. This kit is a direct replacement for Mercury Marine part numbers
Water Pump Repair Kit – Fits Mercury/Mariner 25-50 HP Outboards (Replaces 821354A2, 821354A1, 821354A04)
This water pump repair kit provides the necessary components to service and restore the cooling system on select Mercury, Mariner, and Force outboard engines. It is designed to fit 25-50 HP 2-stroke and 4-stroke outboards from 1995–2018 and 40-50 HP Force outboards from 1995–1999.
This kit is a direct replacement for Mercury Marine part numbers 821354A2, 821354A1, and 821354A04. It also serves as an aftermarket cross-reference for Sierra 18-4531, GLM 12045, and SEI Marine 96-265-03BK.
- Engineered for installation in the lower unit (gearcase).
- Constructed with a corrosion-resistant metal alloy housing and a high-performance neoprene rubber impeller for durability.
- Includes all essential gaskets, seals, and hardware for a complete water pump overhaul.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury Marine | 821354A2 / 821354A1 / 821354A04 |
| Sierra | 18-4531 |
| GLM | 12045 |
| SEI Marine | 96-265-03BK |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | Four Stroke Carb | 25 | 4-Stroke | 1998–2018 (0G590000-0T408999) | 821354A2 | |
| Mercury/Mariner | Four Stroke Carb | 30 | 4-Stroke | 1998–2018 (0G760300-0T408999) | 821354A2 | |
| Mercury/Mariner | Jet | 30 | 4-Stroke | 1998–Up (0G590000-Up) | 821354A2 | |
| Mercury/Mariner | Standard | 30 | 2-Stroke | 1998–Up (0G053314-Up) | 821354A2 | 2 Cylinder models |
| Mercury/Mariner | Standard | 40 | 2-Stroke | 1998–Up (0G053314-Up) | 821354A2 | 2 Cylinder models |
| Mercury/Mariner | Standard | 40 | 3-Stroke | 1998–Up (0G531301-Up) | 821354A2 | 3 Cylinder models |
| Mercury/Mariner | Four Stroke | 40/45 | 4-Stroke | 1998–2018 (0G760300-0T408999) | 821354A2 | 2:1 ratio |
| Mercury/Mariner | Four Stroke Bodensee | 45 | 4-Stroke | 1998–Up (0G231123-Up) | 821354A2 | |
| Mercury/Mariner | Standard | 50 | 3-Stroke | 1998–Up (0G590000-Up) | 821354A2 | 3 Cylinder models |
| Mercury/Mariner | Four Stroke | 50 | 4-Stroke | 1998–Up (0G231123-Up) | 821354A2 | |
| Mercury/Mariner | BigFoot | 50 | 4-Stroke | 1998–2018 (0P017000-0P094499, 0G760300-0T178499) | 821354A2 | |
| Force | Standard | 40/50 | 2-Stroke | 1995–1999 (0E288000-0E369299) | 821354A2 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Repair Kit |
| Installation | Lower Unit / Gearcase |
| Housing Material | Metal alloy (corrosion resistant) |
| Housing Color | Silver/metallic |
| Fitting Type | Direct Replacement |
| Other Technical Attributes | Features corrosion-resistant metal alloy and high-performance neoprene rubber |
Package Contents
- 1 x Water Pump Impeller (Replaces 47-85089-10, 47-85089-3)
- 1 x Drive Key
- 1 x Face Plate/Wear Plate (Replaces 821354-2)
- 1 x Upper Gasket (Replaces 27-822189)
- 1 x Lower Gasket (Replaces 27-822217)
- 1 x Short Water Tube Seal (Replaces 43023)
- 1 x Long Water Tube Seal (Replaces 823547-1)
- 2 x Washer (Replaces 12-86645-1)
Installation Guide
Professional installation is recommended. The following steps are a general guide:
- Disconnect the battery and shift the outboard motor into the neutral position.
- Place a drain pan under the lower unit and remove the drain/fill screws to drain the gearcase oil.
- Remove the bolts that secure the lower unit (gearcase) to the engine's midsection.
- Carefully separate the lower unit from the engine, taking care not to damage the driveshaft or shift rod.
- Unbolt and remove the old water pump housing to expose the impeller and wear plate.
- Remove the old impeller, drive key, gaskets, and seals from the driveshaft and housing.
- Thoroughly clean all mating surfaces, ensuring complete removal of any old gasket material or corrosion.
- Install the new lower gasket, wear plate, and drive key from the kit.
- Slide the new impeller onto the driveshaft, rotating it clockwise to seat the vanes correctly within the housing.
- Install the new upper gasket and any seals, then carefully position the housing and tighten the bolts to specification.
- Re-install the lower unit onto the midsection, ensuring the driveshaft, shift rod, and water tube are correctly aligned.
- Refill the gearcase with the correct type and amount of marine gear lube and reconnect the battery before starting the engine.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine model?
Check the "Compatible Engine Models" table on this page. Match your engine's brand, model, HP, and year/serial number range to the listed specifications. This kit is a direct replacement for Mercury OEM part numbers 821354A2, 821354A1, and 821354A04.
What are the signs that my water pump needs replacement?
Common signs of a failing water pump include a weak or nonexistent water stream from the "tell-tale" outlet, frequent engine overheating alarms, or discovering a brittle, cracked, or melted impeller during a routine inspection.
How often should I replace the water pump impeller?
For preventative maintenance, it's recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 years or every 200-300 hours of use. Replacement intervals should be shorter if you frequently operate in saltwater or debris-heavy water.
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:
- 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
4.6 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
The Innovator's DNA - Disruptive Research - Disruptive Writing
A Politically Correct Status Quo
It is politically correct in management circles to say that you are "results oriented" or that you "drive for results" in your organization.
The status quo in business schools is to indoctrinate students in the delivery skills of analyzing, planning, detail-oriented implementing, and disciplined executing.
This book and the research upon which it is based disrupts that politically correct status quo.
Clayton Christensen has spent close to two decades creating the research, conceptual, and application foundation of the disruptive innovation body of knowledge. He has been working for more than 8 years with Jeff Dyer and Hal Gregersen, both gifted researchers, teachers, and consultants in their own right, on this project. These guys are a disruptive "dream team" of contributors.
This book articulates an extension of the disruptive innovation body of knowledge that clearly describes an individual profile of the disruptive innovator and an organizational profile of an organization that makes disruptive innovation happen.
So what makes this book disruptive?
The first thing is timing. It arrives on the scene at a time when innovation is one of the most critical components of a solution to our global financial and organizational mess. If we are to get out of our morass of debt and sluggish growth and respond to the continually emerging challenges of a burgeoning global society it will ride on the backs and wings of innovation. The status quo must be disrupted for us to survive and thrive!
Second is the audacity of the core models. The authors claim that innovation can be learned at both the individual and organizational level. Individuals can increase their ability to discover (Discovery Quotient - DQ) and learn to be more innovative. They cite the four specific behavioral skills of asking questions, engaging in observations, networking with people who have a different point of view, and experimenting to figure out what can work as the common elements of what innovators do. They also identify the cognitive skill of associational thinking, the ability to find connections between ideas that do not seem to be related to each other, as the connection between the behavioral skills and the generation of ideas. They extend their claim that the innovation competency can be learned to the organizational domain by saying that organizations can become more innovative through developing and leading people, designing and implementing processes, and advocating and living by philosophies that support innovation. These two arguments stand in stark contrast to the beliefs and practices of a vast majority of leaders and institutions.
(For a diagram of the Model see [...])
'And all of this is built upon the third source of disruption: research. Their work is based on well-founded research into the "DNA" of the world's leading innovators and the world's most innovative organizations. The authors conducted nearly 100 interviews of world class innovators and their colleagues to get at the heart of what innovators do. They also interviewed and surveyed executives who are not innovators. (Their survey data base has over 5000 respondents in it.) So they have been able to compare and contrast the two populations to more clearly see what it takes to effectively innovate.
They have also done research on business results attributable to innovation. Collaborating with HOLT (a division of Credit Suisse) they were able to craft a measurement called the "innovation premium." This measure identifies if an organization's market capitalization can be accounted for by existing cash flows or if there is an innovation influence on the stock price. By using this measure, they have been able to clearly and objectively identify which organizations are benefiting from innovation.
Yet to Explore
The tension in the balance of influence and power between the leaders with predominantly "Discovery" or "Delivery" mindsets is an area that has yet to be explored. If the premises of this book are sound, and I believe they are, we need to figure out how to manage that tension and balance in order to generate, incubate, and strengthen innovative ideas as we bring them to full fruition in the marketplace. Great ideas that are not delivered upon are simply recreational pursuits that do not build great people, great institutions, and great societies. So there is work yet to do.
Invest Your Time and Effort
This book makes a significant contribution to both the disruptive innovation body of knowledge and the evolving body of practice on innovating disruptively. It is well worth reading, pondering, and acting upon.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 18, 2011
★★★★★ 5
Inspiring and well-written
This is a very interesting book written by some Harvard profs. They did a large national survey of innovative businesses and their leaders. The book posits that innovative people follow five skills: associating, questioning, observing, networking, and experimenting. These skills can be found at the individual or organizational level. The idea is that most people have these skills in their DNA and can bring them out with some practice. There are a lot of interesting and inspiring examples like Steve Jobs and Jeff Bezos. Although this book seems like a self-help type book with a lot of hype, it has an academic underpinning. Any organization that is interested in promoting innovation could benefit from encouraging these 5 skills. If you are interested in innovation or creativity in business or any organization that produces something, you will like this book. The books is a little distracting to read because it has sidebars all through it giving interesting examples that break up reading concentration. Aside from that, it is a well-written book that is easy and enjoyable to read. I enjoyed the book greatly and found it to be inspiring.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2015
★★★★★ 4
Great read and research. But what about daily application for regular people?
The research piece behind this book might be the next thing I read, as I'm intrigued by the academic rigor applied.
The reveal and living examples of the five skills - questioning, networking, experimenting, observing and associating - are tangible and approachable given their articulation through well-known and highly visible entrepreneurs running innovative companies. There's much to be gleaned by looking at the way these people behave and, even through simple emulation, enhancing one's own skills.
My only real disappointment with the book is its limited approach to practical, daily application for those not yet at the top of the tree. It's rather a different kettle of fish for the innovation-minded, but stuck in bureaucracy, worker who wants to make things better, is still motivated, and hasn't been crushed by the machine. How does that person actively innovate? And, in some cases, get away with it? This book (or an accompanying volume) focussing on daily, in-work, innovation would be useful.
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Reviewed in the United States on May 23, 2013
★★★★★ 5
A Favorite Book on Innovation
Format: Hardcover
Very well written and enough stories to help the true content stick. This is a favorite book of mine and has lead to interesting conversations to boot.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 29, 2025
★★★★★ 5
An exceptional five stars out of five
Few qualities separate inordinately successful entrepreneurs from the rest of the pack than the ability to innovate. Many have debated whether individuals are born with this quality or whether it can be nurtured. In The Innovator's DNA, Jeff Dyer, Hal Gregersen and Clayton Christensen explain that while genetics play a role, innovation is most certainly a skill that can be learned.
In particular, the authors introduce and expound upon five "discovery skills" found in the leaders of some of the most innovative companies in the world: (1) associating, (2) questioning, (3) observing, (4) networking and (5) experimenting. Each discovery skill is accompanied by real-world examples and pragmatic exercises that make the book unusually valuable in an age where copious books on change, leadership and innovation overwhelm the already-overwhelmed executive.
I give The Innovator's DNA an exceptional five stars out of five. The authors present a very readable book and provide concrete exercises for developing innovative skills. Using the principles provided in the book, I created a folder on my computer that I call my "Innovation Room." I use this to track progress as I work through various exercises and as I take time to ponder about how to apply innovative solutions to extant problems in Utah. This book was and will continue to be useful to me, and is recommended as a must-read for those interested in adding rare innovative attributes to their arsenal of problem-solving and decision-making skills.
*NOTE: The preceding text is taken verbatim from my short book review printed in the June 2012 edition of Utah Business.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2013
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