Pay in installments of $8.87 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 3 - Aug 8
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Thermostat (160°F/71°C) – Fits MerCruiser V6/V8 Alpha/Bravo Engines (Replaces 8M0109441, 807252T2)Thermostat (160F 71C) Fits MerCruiser V6 V8 Alpha Bravo Engines (Replaces 8M0109441, 807252T2) This thermostat is designed for Mercury MerCruiser V6 & V8 engines with standard cooling systems that require a 160F thermostat. It is primarily used in 1987present Alpha Bravo sterndrives and inboards. It serves as a direct replacement for Mercury MerCruiser part numbers 8M0109441 (which supersedes 8M0091470, 807252T2, 8072522, and 8052732) and Sierra 18
Thermostat (160°F/71°C) – Fits MerCruiser V6/V8 Alpha/Bravo Engines (Replaces 8M0109441, 807252T2)
This thermostat is designed for Mercury MerCruiser V6 & V8 engines with standard cooling systems that require a 160°F thermostat. It is primarily used in 1987–present Alpha/Bravo sterndrives and inboards.
It serves as a direct replacement for Mercury/MerCruiser part numbers 8M0109441 (which supersedes 8M0091470, 807252T2, 8072522, and 8052732) and Sierra 18-3649.
- Temperature Rating: 160°F (71°C) opening temperature
- Installation: Direct replacement using standard tools
- Quality: Manufactured to OEM specifications in an ISO9002 certified factory
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury/MerCruiser | 807252T2 | 8M0091470 / 8M0109441 | |
| Mercury/MerCruiser | 8M0091470 | 8M0109441 | |
| Mercury/MerCruiser | 8M0109441 | Current Part | |
| Sierra | 18-3649 | Aftermarket Replacement |
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 | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | 350 MAG MPI ALPHA/BRAVO | 4-Stroke | 1A300000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 350 MAG MPI SKI | 4-Stroke | 0M300000–0M316999 | 8M0109441 | Previously 807252T2 |
| MerCruiser | BLACK SCORPION 350 MAG MPI | 4-Stroke | 0M391600–0W689999 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 377 MAG MPI BRAVO | 4-Stroke | 1A300000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | SCORPION 377 | 4-Stroke | 0W698433 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 4.3L CARB ALPHA/BRAVO | 4-Stroke | 0M615000–0W649999 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 4.3L MPI ALPHA/BRAVO | 4-Stroke | 0M615000–0W309999 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 5.0L MPI ALPHA/BRAVO | 4-Stroke | 1A300000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 5.7L EFI MIE GM 350 V-8 | 4-Stroke | 1997, 0K040300–0K261160 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 5.7L MPI MIE EC | 4-Stroke | 1A090000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 6.2L MPI MIE EC | 4-Stroke | 1A091600 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | MX 6.2L MPI BRAVO | 4-Stroke | 0L680003–0M299999 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 502 MAG MPI BRAVO (GEN VI) | 4-Stroke | 1998, 0L017000–0L085432 | 8M0109441 | Previously 807252T2 |
| MerCruiser | 454 MAG MPI BRAVO (GEN VI) | 4-Stroke | 1998, 0L010029–0L058399 | 8M0109441 | Previously 807252T2 |
| MerCruiser | SCORPION 350 | 4-Stroke | 0W698433 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 3.0L TKS Plus | 4-Stroke | 1G404114 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 350 MPI ALPHA | 4-Stroke | 1G400000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 357 Alpha 4V | 4-Stroke | 1G400000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 357 Mag Bravo 4V | 4-Stroke | 1G400000 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 357 STROKER SCORPION | 4-Stroke | 1G481121 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 383 Mag Bravo 4V | 4-Stroke | 1G480748 & Up | 8M0109441 | Previously 807252T2 |
| MerCruiser | 383 MAG STROKER INBOARD | 4-Stroke | 1G300000 & Up | 8M0109441 | Previously 807252T2 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat |
| Temperature Rating | 160°F (71°C) |
| Installation | Direct replacement, standard tools |
| Fuel Type | Compatible with all fuel types |
| Connection | Standard MerCruiser configuration |
| Housing Color | Silver/Metallic |
| Operating Temperature | 160°F (71°C) opening temperature |
| Warranty | Standard manufacturer warranty |
| Other Technical Attributes | Manufactured to OEM specifications, produced in ISO9002 certified factory |
Package Contents
- 1 x Thermostat (8M0109441)
Installation Guide
- Ensure the engine is completely cool before starting work.
- Locate the thermostat housing, usually where the large coolant hose from the top of the engine connects.
- Place a drain pan under the housing to catch any coolant that spills.
- Unscrew the bolts holding the thermostat housing cover in place.
- Gently remove the cover. Take note of how the old thermostat is positioned before removing it.
- Take out the old thermostat and its gasket. Thoroughly clean the gasket mating surfaces on both the housing and the cover.
- Insert the new thermostat, making sure it is oriented in the same direction as the original.
- Position the new gasket correctly on the housing.
- Re-attach the housing cover and tighten the bolts to the manufacturer's recommended torque specification.
- Refill the cooling system with the correct type and amount of coolant.
- Start the engine and carefully check for leaks around the thermostat housing.
- Let the engine run until it reaches normal operating temperature to confirm the new thermostat opens properly.
Troubleshooting & FAQ
Q: How do I confirm this thermostat fits my MerCruiser engine?
A: This thermostat fits a wide range of V6 and V8 MerCruiser Alpha/Bravo engines from 1987 to the present. The best way to confirm is to match your engine's serial number with the ranges listed in the "Compatible Engine Models" table or to cross-reference your existing part number with 8M0109441, 807252T2, or Sierra 18-3649.
Q: What are the signs of a failing thermostat?
A: Common signs include the engine overheating, the temperature gauge reading unusually low, or significant fluctuations in engine temperature. A thermostat stuck open will prevent the engine from reaching its proper operating temperature, while one stuck closed will cause it to overheat quickly.
Q: Why is a 160°F thermostat used in marine engines?
A: A 160°F (71°C) thermostat is specified for standard raw water cooled marine engines to ensure they reach the optimal operating temperature quickly without overheating. This helps improve fuel efficiency, reduce engine wear, and prevent the buildup of carbon deposits.
Q: Is a gasket included with this thermostat?
A: The package contains one thermostat. Gaskets are typically sold separately and should be replaced during installation to ensure a proper seal.
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
4.4 ★★★★★
Based on 11 reviews
Sort
Product Reviews
★★★★★ 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.
WAS THIS REVIEW HELPFUL?YesReportShare
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!
WAS THIS REVIEW HELPFUL?YesReportShare
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.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
★★★★★ 5
A book worth rereading
Format: Hardcover
This was a book club pick. Honestly, I wouldn't have chosen to read this myself, but I'm glad that I did. I would have missed out on an incredible story.
I've been reading a lot of thriller and fantasy books lately, that I forgot how much I enjoy sci-fi. This brought it back for me. There's a lot of science-heavy discussions in the book and I loved it! When I got to a subject or term I didn't know, I would go online and learn more about it. I feel that Grace is a dork like me because he wouldn't curse. He had little anecdotes he uses in place of swearing. Something I definitely do myself!
A lot of the book is the MMC talking to himself. Surprisingly, it worked. There's so much humor that it kept the story going. There was not a lull. Usually I dislike info-dumping as an introduction to get all the background story told, but I didn't mind it at all. Maybe I'm being biased because I love science talk.
**SPOILERS AHEAD**
What makes the whole plot engaging is the fact that the plot doesn't seem too fantastical. It's something that could happen. There's a lot of ethics and morals involved in determining what should be done. I would hate to be in a position where I have to chose what's best for everyone. That's why Stratt is a necessary character. I hated some of her decisions and how she operated, but you need someone who's focused on the general welfare of humanity. I would be too focused on myself, my family, etc. As much as it hurts to admit, I'm selfish (and a coward) like Grace. I wouldn't want to die. But was it right for Stratt to force him on the mission? This could also be taken religiously. If God has a plan and things happen for a reason, is it our right to deter what's going to happen? God wiped out the world many times because of humanity's sins, what if this was God's doing? So many questions and debates on right vs wrong, ethics vs morals, and religion vs humanity made for a incredible book club discussion.
I love how this book ended. I wish I could continue reading about Rocky and Grace's adventures, it's that fascinating. However, I think Grace staying on Erid was the best outcome. If the roles were reversed, I don't think Rocky would have the same welcome. I feel that those in charge would have dissected and kept Rocky hostage, all in the name of science. Just as the Astrophage were first introduced, the first things the scientists did was poke and probe. Essentially torturing the Astrophage to see what makes them tick. I think Rocky would have the same fate.
Oh, and my favorite part is the relationship between Rocky and Grace. I cried so many times when I was reading. Scared that something bad was going to happen to either of them. Especially in the scene where Rocky busted out of his tunnel to save Grace. I got upset and told the book that 'if Rocky dies, I swear, this is the worst book ever!' And the scene where Rocky learns about radiation poisoning. How he slowly becomes aware of what happened to his crew, his friends. I was a mess.
This book is definitely one that I could go back and reread.
I did watch the movie afterwards. There's a lot of differences to adapt the story to screen, but it was okay. They got the humor down pat, but I didn't get the direness of the whole situation nor the special bond that both MCs had.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 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.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026