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Description
Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 4-6 HP Outboards (Replaces 369-87322-0/1/2, 369873220M/1M/2M)Water Pump Impeller Repair Kit Fits Tohatsu Nissan 4 6 HP Outboards This water pump impeller repair kit is designed for Tohatsu and Nissan 4 HP, 5 HP, and 6 HP 4 Stroke outboard motors. It provides a reliable solution for maintaining your engine's cooling system, fitting MFS4 5 6 and NSF4 5 6 series engines among others. This kit serves as a direct replacement for Tohatsu part numbers 369 87322 0, 369873220M, 369873222M; Nissan part numbers 369 87322
Water Pump Impeller Repair Kit – Fits Tohatsu/Nissan 4-6 HP Outboards
This water pump impeller repair kit is designed for Tohatsu and Nissan 4 HP, 5 HP, and 6 HP 4-Stroke outboard motors. It provides a reliable solution for maintaining your engine's cooling system, fitting MFS4/5/6 and NSF4/5/6 series engines among others.
This kit serves as a direct replacement for Tohatsu part numbers 369-87322-0, 369873220M, 369873222M; Nissan part numbers 369-87322-1, 369873221M; and Mercury part number 16159A03.
- Complete Kit: Includes essential components for a full replacement: impeller, gaskets, and guide plates.
- Durable Materials: Constructed from a robust combination of plastic and metal for longevity.
- Direct Fit: Engineered for direct installation without modification.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By |
|---|---|---|
| Tohatsu | 369-87322-0 | 369873222M |
| Tohatsu | 369873220M | 369873222M |
| Nissan | 369-87322-1 | |
| Nissan | 369873221M | |
| Mercury | 16159A03 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Tohatsu | M4C | 4 | 4-Stroke | 369-87322-0 | |
| Tohatsu | MFS4B | 4 | 4-Stroke | 2002-2014 | 369-87322-0 |
| Tohatsu | MFS4C | 4 | 4-Stroke | 2011-2014 | 369-87322-0 |
| Tohatsu | M5B | 5 | 4-Stroke | 2003 | 369-87322-0 |
| Tohatsu | MFS5B | 5 | 4-Stroke | 2002-2010 | 369-87322-0 |
| Tohatsu | MFS5C | 5 | 4-Stroke | 2011-2014 | 369-87322-0 |
| Tohatsu | MFS6B | 6 | 4-Stroke | 2002-2010 | 369-87322-0 |
| Tohatsu | MFS6C | 6 | 4-Stroke | 2011-2014 | 369-87322-0 |
| Nissan | NS4C | 4 | 4-Stroke | 369-87322-1 | |
| Nissan | NSF4B | 4 | 4-Stroke | 2002-2010 | 369-87322-1 |
| Nissan | NSF4C | 4 | 4-Stroke | 2011-2014 | 369-87322-1 |
| Nissan | NS5B | 5 | 4-Stroke | 2003 | 369-87322-1 |
| Nissan | NSF5A2 | 5 | 4-Stroke | 2002 | 369-87322-1 |
| Nissan | NSF5B | 5 | 4-Stroke | 2002-2010 | 369-87322-1 |
| Nissan | NSF5C | 5 | 4-Stroke | 2011-2014 | 369-87322-1 |
| Nissan | NSF6B | 6 | 4-Stroke | 2002-2010 | 369-87322-1 |
| Nissan | NSF6C | 6 | 4-Stroke | 2011-2014 | 369-87322-1 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Repair Kit |
| Installation | Direct replacement |
| Housing Material | Plastic + metal |
| Components | Impeller, gaskets, guide plates |
| Dimensions | As shown in manufacturer images [verify orientation] |
| Weight | 7.1 ounces (201g) |
| Warranty | Varies by seller (1 year for FridayParts) |
Package Contents
1 x Water Pump Impeller Repair Kit, replacing OEM parts 369-87322-0/369873220M and 369-87322-1/369873221M.
Installation Guide
- Safety First: Disconnect the battery and remove the engine cover before starting work.
- Drain Gear Lube: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gear lube.
- Remove Lower Unit: Unbolt the lower unit (gearcase) from the engine's midsection and carefully lower it.
- Access Impeller: Remove the bolts securing the water pump housing. Lift the housing to expose the old impeller. Note the rotational direction of the old impeller's blades.
- Remove Old Components: Take out the old impeller, woodruff key, wear plates, and gaskets.
- Clean Surfaces: Thoroughly clean the mounting surfaces of the housing and base plate, removing any old gasket material or corrosion.
- Install New Components: Place the new gaskets and wear plates on the housing and base. Install the new woodruff key in the driveshaft slot.
- Install New Impeller: Slide the new impeller down onto the driveshaft. Turn the driveshaft clockwise while pushing down to ensure the impeller blades are oriented correctly.
- Reassemble Pump: Apply a light coat of marine grease to the inside of the housing and reinstall it. Tighten bolts to the manufacturer's specified torque.
- Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft and water tube align. Securely tighten the mounting bolts.
- Refill Gear Lube: Fill the lower unit with fresh gear lube from the bottom fill hole until it seeps out the top one, then replace both screws.
- Test Operation: Reconnect the battery, start the engine in water, and verify a steady stream of water is exiting the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this fits my engine?
This kit is designed for Tohatsu/Nissan 4, 5, and 6 HP 4-stroke outboards (e.g., MFS/NSF series). The most reliable method to ensure fitment is to match your engine's original part number to our cross-reference list (e.g., 369-87322-0, 369-87322-1, etc.). You should also consult the compatible engine model table to verify your specific model and year.
What are the signs of a failing water pump impeller?
Common signs of a worn or damaged impeller include a weak or intermittent water stream from the "tell-tale" exhaust port, engine overheating alarms, or reduced engine performance. Failure to replace it can lead to severe engine damage.
How often should I replace the water pump impeller?
As a general rule for preventative maintenance, you should inspect the impeller annually and replace it every 1-2 years or 100-200 hours of use. Replacement intervals may be shorter if you frequently operate in sandy, silty, or saltwater environments.
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 Fitment: 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.
- Aftermarket Part: This product is an aftermarket replacement part and is not an OEM component.
- Installation: 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
4.8 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 3
Not a bad start
Format: Kindle
3 stars
Thank you Netgalley and Briar Boleyn for the ARC!
A camelot/king Arthur retelling with fae. I was hooked by the idea of this book immediately and was eager to jump into this world.
• slow burn
• enemies to lovers
• who did this to you
Morgan Pendragon watched her mother die by her father's hand when she was just eight years old, hiding under the bed. Morgan is believed to have the tainted blood of the fae in her veins and is cast aside so that her fathers illegitimate son, Arthur, can become the king. She's seen his cruel treatment of the fae firsthand, so when he sends her on a journey to find a fae weapon she seizes the opportunity to do more with her life. Along the way, she finds more than she could have imagined.
I don't know a whole lot about King Arthur and Camelot but I had a lot of fun with this story! The plot has some similar tropes to popular romantasy books (From blood and ash) but there's enough originality here that it doesn't feel like I'm reading a copy. I liked how the fae were different in appearance than what is typical in most fantasy books I've read. In this book they have blue hair, violet skin and a wide range of other characteristics. I thought that the world building was easy to follow and I could easily immerse myself into this world. After reading the blurb I kept wondering when she was going to go on the journey to find Excalibur and it doesn't happen until around the 45% mark.
The story is a bit slow at times but starts to pick up once they begin their journey to find Excalibur. The John Wick style Inn was a fun concept that I enjoyed reading about.
There are a lot of similarities to this and FBAA and I would have liked to have it be a little more different, but I'm hoping book two will have the story turn into something of its own. Overall I enjoyed reading this story and I'm looking forward to reading book two especially after that ending.
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Reviewed in the United States on May 27, 2023
★★★★★ 5
Astonishing, Fun, Entertaining, Fantastic
Format: Kindle
I consider The Martian my favorite fictional novel of the last 15-20 years. The movie was incredible in that they actually followed the book closer than 99% of other films based on books. It remains my favorite movie of the last 15 years or so as well. I don't know anyone (personally) that loves either of them as much as I do.
With that said, I was REALLY looking forward to Artemis. It was good...but, it was certainly not in the same caliber as The Martian was (at least not for me). I enjoyed it a lot, however and appreciated how author Andy Weir chose to go in a completely different direction and not just rehash another similar story, which I am certain would have been great as well.
As a result, I was cautious regarding Project Hail Mary. It sounded a little too close to The Martian, but yet, also different in that the circumstances simply could not be more opposite and the stakes so much higher. I'm trying to figure out the best way to summarize without giving too much away from this utterly compelling novel. As I read several reviews, I noticed a recurring theme: SCIENCE. Lots and LOTS of science. Holy cow, they were right. Many years ago I read Apollo 13 and Jim Lovell and his co-writer, try as they might, simply could not dumb down Orbital Mechanics anywhere near enough for me to have even a minor clue as to what they were attempting to say...I just skipped 90% of it and hoped that the sentences written afterwards, would help to make sense of what I had just skimmed over. I'm a lot of things, but a math wizard is definitely not one of them. Michael Crichton (Jurassic Park) had an amazing talent for dumbing-down the science of what he was trying to explain in ways that genuinely made sense (most of the time). Not everyone has this talent, and I would say Andy Weir falls squarely in between. He's certainly better than Jim Lovell, but not quite as good as Crichton. But then again, outside of a science textbook, I haven't really read anything with quite as MUCH science as Project Hail Mary. So maybe he's just as good, but he just puts more science into his books than Crichton, maybe that's it...? Either way, be prepared for a lot of astonishingly interesting science within the pages of this novel...and I DO mean a LOT. I don't say this to make you wary or steer you away...on the contrary, Andy Weir has a special talent for making hard science truly entertaining.
The book opens with an absolutely amazing and frightening premise: an astronaut awakes from an induced coma to find the only other two people on board have died at some point along their journey...but it gets worse. He has no idea who he is, or why he's on the ship, and oh yeah, they look to be a long way from home. A really, REALLY long way from home. In fact, the sun he sees isn't actually OUR sun at all. He's managed to leave our solar system entirely. And he has no idea why.
((Minor Spoilers)) The book goes through some clever flash-backs, which set the stage for why the mission happens, and slowly, carefully explains how they managed to get so far away from earth in such a short amount of time. Basically, earth's sun seems to be dying. At the rate of decay, we have maybe 19 years left before the gradual cooling has catastrophic consequences resulting in the death of billions (best guess). Why the sun is dimming is quite the conundrum in the first place. Turns out it really isn't dying, it's being killed by an outside source...which turns out to be easily the greatest find in history. It's alien life, and they are using the sun for food, essentially. It's alien life, but not intelligent life. But still, wow! ALIENS, right???
After this monumental discovery, and some tremendous research done by the most improbable scientist, the investigation into what is happening and why and what to do about it expands exponentially to other nations in order to pool all the resources possible to hopefully save the sun, and by extension, the human race as well. They learn. A LOT. A plan is put together, and with the help of the newly discovered microscopic alien life, which can also double as a power source (along with a few other nifty surprises), they begin to create one last, Hail Mary that could very well be the last chance we might have to save earth. It's audacious. It's dangerous, and it is absolutely critical that it succeed.
As our astronaut's memory slowly unravels, so does his identity: Ryland Grace. He's a teacher on earth. Just a science teacher. Not even a college professor. He's amazingly smart, though. But he's no astronaut...and certainly not one who would volunteer to go on a one-way mission to another solar system to "try" and save humanity. Yet here he is. Alone. light years from earth, trying to solve the biggest riddle in all of human history. Ryland accepts his situation, such as it is, with relative indifference (for the most part). It doesn't matter HOW he got here. He's here now and he may as well use that time to be as productive as possible, right? Along the way, he unravels even more information regarding the microscopic alien life which is slowly dimming our sun during some additional flashbacks. The aliens, dubbed, "Astrophage" are quite the galactic plague as it turns out. Stars all over the galaxy are also losing their light, all due to the little buggers. All that is, except one particular star named, Tau Ceti. Now why would that one star be unaffected by Astrophage, when every single star around it has been affected to some degree. The plan is to go there and figure it out and send the information back, hopefully in time to save the sun before the damage to earth is beyond repair.
There is an incredible amount of stuff going on. The story switches from Tau Ceti to flashbacks of how the whole mission was planned and implemented (which is VERY entertaining, especially Director Stratt, who may actually be my favorite character in the entire novel). Weir is becoming quite adept at building tension, and abruptly switching the story from Tau Ceti back to earth and building more of the backstory then switching back to Tau Ceti. Keeping it all in check and most importantly, interesting all while mixing in a healthy dose of science, which I am to understand is pretty much all genuine, is quite the juggling act. I have long known science can be astronomically entertaining (see what I did there?) when done right...but unfortunately very few people in a position to teach science actually know the best way to create that interest in others. I can say without reservation, Andy Weir definitely knows how to do it...at least in written form.
There is so much I want to say more regarding this truly phenomenal story, but I simply cannot without ruining a lot of the fun and surprises revealed along the way...and it is killing me to keep it locked in. Though I labeled a spoiler warning earlier, I don't think it gave away any more than what the author himself has revealed in interviews he has done regarding the book, and what you can glean from reading the summary here and just a couple other reviews. Tying all of that science together is truly astonishing to me. The creativity to put it into a novel that is remarkably exciting to read is nothing more than incredible talent. Kudo's to Andy Weir for not just hitting a home run, Project Hail Mary is a Grand Slam all the way. I truly did not want this story to end. By the way, I enjoyed the ending quite a bit. I don't know if everyone will. But it was fine for me. I think the ending screams "sequel" at some point too. A lot was left open-ended (IMO) and I wouldn't mind reading a follow-up to this. It doesn't HAVE to happen, but there are a lot of ways where the story could go if Andy chose to do it. Just sayin'.
Just run out and buy this book.
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Reviewed in the United States on May 10, 2021
★★★★★ 5
Wonderful
Format: Kindle
The amount of detail in this book is so interesting and the specifics of so much theoretical ideas revolving around true ideas makes it so fun to read. The writer does a great job and describing every situation enough where you get the point but not too much to try to bore you . The book is very easy to follow, keeps you on your toes, was pretty funny to me, and truthfully just a great book for anyone!
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Reviewed in the United States on May 20, 2026
★★★★★ 4
Read it in 2 days
Format: Paperback
This is science based science fiction. How refreshing to read science without turning the story into horror. Without a plethora of characters, it is easy to remember who is who. The story moves along well enough that I wanted to keep going. It us a p age turner in many respects.
All this said, there were too many crises suddenly resolved like some Star Trek episode from 1966. It reached the point where I said to myself, "OK, this doesn't matter. Move along, nothing to see here."
There was good humor, some surprising twists, and enough involvement with characters that I didn't want to put it down.
As science fiction goes, it was good like pulp stories go. It wasn't like Ursula LeGuin or Robert Heinlein but I would probably pick up the next book he writes.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Excellent story
Format: Kindle
This book is worth your time. It is a great introduction to a variety of scientific disciplines without insulting the reader. It also respects and understands humanity, engineering, history and political science. Then it lays that foundation to tell the story of a unique friendship of two beings with mutual goals who have to communicate and problem solve together. Along the way, you can really contrast how Grace and Rocky do it, vice the Hail Mary team did it.
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Reviewed in the United States on May 22, 2026