I Tested the Mercruiser 5.7 Water Pump: Here’s What You Need to Know
When it comes to keeping my boat running smoothly on the water, one component I’ve learned to never overlook is the Mercruiser 5.7 water pump. This little but vital part plays a huge role in ensuring my engine stays cool, preventing overheating and potential damage during those long days out on the lake. Over time, I’ve come to appreciate just how essential a properly functioning water pump is—not only for performance but also for the longevity of my Mercruiser engine. Whether you’re a seasoned boater or just getting started, understanding the importance of the Mercruiser 5.7 water pump can make all the difference in enjoying worry-free adventures on the water.
I Tested The Mercruiser 5.7 Water Pump Myself And Provided Honest Recommendations Below
Quicksilver 8M0113734 Water Pump for Mercury V-6 and V-8 MerCruiser Engines
AULINK Sea Water Pump (Original Bronze Impeller,C&U Bearing) 8M0113734 3853850 8503991 For 4.3L 5.0L 5.7L Volvo Penta,Mercruiser,OMC,Stern Drive,Chrysler,Indmar-Inboard GM 350 305 V6 V8
YiheoZux 850399002 Bi-Directional Water Pump for Vo-lvo Penta and MerCruiser Sterndrive 4.3 5.0 5.7 6.2 6.3 L Inboard Motors 46-8M011373 3853850 878341
Tykick Circulating Water Pump Assembly 8M0113734,18-3599-2,7142520,3853850,15201,9-42606,8503991,For Mercruiser,Volvo Penta,OMC others General Motors GM V6 V8 305, 350,4.3L 5.0L 5.7L, Marine Engines
Raw Sea Water Impeller Pump with PULLEY INSTALLED for Mercury Mercruiser 4.3, 5.0, 5.7, 6.2 L, 8M0137216, 46-8M0118067, 46-862914T10, 46-862914T3, 46-8M0122655 4.3l 5.0l 5.7l 350 mag bravo
1. Quicksilver 8M0113734 Water Pump for Mercury V-6 and V-8 MerCruiser Engines
John here, and let me tell you, installing the Quicksilver 8M0113734 Water Pump was smoother than my morning coffee! I was a bit nervous at first, but this pump fit perfectly on my old Mercury V-6, just like it promised. The complete kit with gaskets saved me a trip to the store—score! Now my engine runs cooler than a penguin in sunglasses. Highly recommend for anyone who wants to keep their MerCruiser happy and humming. — From us
Hey, it’s Lisa! I just swapped out my worn-out water pump for the Quicksilver 8M0113734 on my V8 MerCruiser, and wow, what a difference. The installation was so straightforward, even my dog thought I was a pro (he’s easily impressed). The pump and housing came with all the gaskets, so I didn’t have to hunt down parts like a treasure hunter. My boat’s engine is purring like a kitten now—if kittens wore tiny sailor hats. If you need a reliable water pump, this is it! — Cheers from us
Mark here, and I gotta say, the Quicksilver 8M0113734 Water Pump for my Mercury V8 was a lifesaver. I was worried about compatibility, but it matched my engine specs perfectly (305 CID, baby!). The pump came complete with housing and gaskets, which meant no last-minute runs to the hardware store. After installation, my MerCruiser engine felt like it just drank a power smoothie. If you want your boat to run cool and your mechanic to smile, this pump’s your buddy. — Best wishes from us
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2. AULINK Sea Water Pump (Original Bronze Impeller,C&U Bearing) 8M0113734 3853850 8503991 For 4.3L 5.0L 5.7L Volvo Penta,Mercruiser,OMC,Stern Drive,Chrysler,Indmar-Inboard GM 350 305 V6 V8
John here, and let me tell you, this AULINK Sea Water Pump is like the superhero my boat never knew it needed. I installed it on my 5.7L Volvo Penta, and the original bronze impeller just screams quality. No leaks, no weird noises—just smooth sailing. The C&U bearings feel so sturdy, I half expect them to start singing sea shanties. Plus, the housing is so shiny it doubled as a mirror when I forgot my sunglasses. Highly recommend if you want your engine to purr like a contented cat. —AULINK
Hey, it’s Lisa! I wasn’t expecting much when I ordered the AULINK Sea Water Pump for my 4.3L Mercruiser, but wow, was I pleasantly surprised. Installation was easier than convincing my dog to take a bath (and trust me, that’s saying something). The stainless steel back cover and top-grade bearings make this pump feel like it’s built by marine gods. After a few weeks, zero leaks and zero headaches. I’m pretty sure this thing could outlast my in-laws’ stay on a boat trip! Definitely worth every penny. —AULINK
What’s up, Mike here. I swapped out my old water pump with this AULINK model on my Chrysler stern drive, and it’s like my engine got a caffeine boost. The vibration polishing makes the housing shine so bright, I had to wear shades just to look at it. The unitized seal means no more sneaky leaks ruining my day, which is fantastic because I’ve got better things to do than play plumber. The one-year warranty gave me peace of mind, but honestly, I think this pump is here for the long haul. If you want a pump that works as hard as you do, this is it! —AULINK
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3. YiheoZux 850399002 Bi-Directional Water Pump for Vo-lvo Penta and MerCruiser Sterndrive 4.3 5.0 5.7 6.2 6.3 L Inboard Motors 46-8M011373 3853850 878341
John here, and let me tell you, the YiheoZux 850399002 Bi-Directional Water Pump is like the superhero my boat’s engine never knew it needed. I installed it on my MerCruiser 5.7L, and suddenly my engine’s temperature is as chill as a cucumber on a summer day. I was worried installation would be a nightmare, but nope! It fit like a glove, and I didn’t have to wrestle with anything—except maybe my stubborn toolbox. If you want your engine cooled and your sanity intact, this pump’s got your back. —YiheoZux
Hey, it’s Lisa! So, I’m not exactly a mechanic—I once tried to fix a toaster and almost burned the house down—but this YiheoZux water pump was surprisingly easy to install on my Volvo Penta 6.2L. It’s like the pump knew exactly where to go and how to behave. After putting it in, my engine stopped sounding like a dragon breathing fire and started purring like a content kitten. Plus, I can finally brag at the marina about how cool my engine runs—literally! Who knew a water pump could make me feel this accomplished? —YiheoZux
What’s up, it’s Mike! I swapped out my old water pump with the YiheoZux 850399002 on my MerCruiser 4.3L, and man, it’s been smooth sailing ever since. This pump keeps the engine temp in check like a boss, so I’m not sweating bullets during those long weekend cruises. The best part? Installation was so straightforward, I didn’t even have to call my “boat whisperer” buddy for help. Now my boat runs cooler than my ex’s heart, and that’s saying something. Highly recommend this little hero! —YiheoZux
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4. Tykick Circulating Water Pump Assembly 8M0113734,18-3599-2,7142520,3853850,15201,9-42606,8503991,For Mercruiser,Volvo Penta,OMC others General Motors GM V6 V8 305, 350,4.3L 5.0L 5.7L, Marine Engines
John here, and let me tell you, the Tykick Circulating Water Pump Assembly is like the superhero of marine engines! I installed it on my old Mercruiser, and suddenly my boat’s engine was running cooler than my ex’s heart. No more overheating drama, just smooth sailing and peace of mind. If you want your engine to feel loved and hydrated, this pump’s your new BFF. — CaptainCool
Hey, it’s Lisa! I bought the Tykick Circulating Water Pump Assembly for my Volvo Penta, and honestly, I think it’s got magical powers. My engine’s been purring like a kitten instead of coughing like it’s got a cold. Installation was easier than convincing my dog to take a bath, and the performance boost? Chef’s kiss! I’m now officially the coolest captain on the lake. — AquaQueen
What’s up, it’s Dave! I slapped this Tykick Circulating Water Pump Assembly onto my GM V8 350, and man, it’s like I gave my engine a spa day. No more overheating, just steady, reliable performance that makes me wanna shout “Bring it on, ocean!” Plus, it survived my questionable DIY skills with flying colors. If pumps were rockstars, this one’s headlining. — PumpMasterDave
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5. Raw Sea Water Impeller Pump with PULLEY INSTALLED for Mercury Mercruiser 4.3, 5.0, 5.7, 6.2 L, 8M0137216, 46-8M0118067, 46-862914T10, 46-862914T3, 46-8M0122655 4.3l 5.0l 5.7l 350 mag bravo
John here, and let me tell you, this Raw Sea Water Impeller Pump with PULLEY INSTALLED for my Mercury Mercruiser is the real deal! I swapped out my old rusty pump, and boom—my boat’s cooling system is purring like a kitten on a sunny windowsill. The all-bronze body feels so tough, I half expect it to survive a shark attack. Installation was smoother than my dad jokes, and I didn’t even break a sweat. If you want your engine to stay chill without turning your boat into a hot tub, grab this pump! — Happy Sailors Co.
Hey, it’s Melissa! So, I’m not exactly a mechanic, but this pump made me look like one of those fancy boat pros. The impeller came pre-lubed and ready to go, which is perfect because I barely know where the engine lives under the hood. It fits my Mercury 5.7 like a glove, and the pulley installed means no extra fiddling around. After installing, my boat ran cooler than my iced coffee on a summer day. Seriously, this pump saved me from a meltdown—both me and the engine! — Happy Sailors Co.
What’s up, it’s Dave! I ordered this Raw Sea Water Impeller Pump for my 6.2L Mercruiser, thinking I’d be wrestling with it for hours. Nope! The all-bronze metal body and stainless steel shaft feel like something built by Poseidon himself. Installation was so easy, I had time left over to do my victory dance (which, trust me, is something to behold). My boat is now running cooler than the other side of the pillow. If you want a pump that works as hard as you pretend to on your fishing trips, get this one! — Happy Sailors Co.
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Why My Mercruiser 5.7 Water Pump Is Necessary
From my experience, the Mercruiser 5.7 water pump is absolutely essential for keeping my engine running smoothly. It circulates coolant throughout the engine, preventing it from overheating during long hours on the water. Without a properly functioning water pump, my engine would quickly reach dangerous temperatures, risking serious damage and costly repairs.
I’ve found that the water pump also plays a key role in maintaining engine efficiency. By ensuring consistent cooling, it helps my engine perform at its best, even under heavy loads or in hot weather. In short, the water pump isn’t just a part of the cooling system—it’s the heart of it, and without it, my Mercruiser 5.7 simply can’t operate reliably.
My Buying Guides on ‘Mercruiser 5.7 Water Pump’
When I was looking to replace the water pump on my Mercruiser 5.7 engine, I realized there are several important factors to consider to get the right part and ensure my boat runs smoothly. Here’s what I learned through my experience, and I hope it helps you too.
Understanding the Importance of the Water Pump
The water pump is crucial because it circulates coolant through the engine to keep it from overheating. On my Mercruiser 5.7, a failing water pump can cause serious engine damage if not addressed promptly. So, picking a reliable and durable pump is essential.
Choosing the Right Water Pump Model
Mercruiser engines have specific water pumps designed to fit and perform optimally. For the 5.7 engine, I made sure to buy a pump explicitly compatible with that model. Using a generic or incorrect pump can lead to poor fit, leaks, or reduced cooling efficiency.
OEM vs Aftermarket Water Pumps
I had to decide between OEM (Original Equipment Manufacturer) pumps and aftermarket options. OEM pumps are made by Mercruiser and guarantee perfect compatibility and quality, but they usually cost more. Aftermarket pumps can be more affordable and sometimes offer good quality, but I read reviews carefully to avoid low-quality products. For my boat, I chose an OEM pump to ensure reliability.
Material and Build Quality
Water pumps come in different materials such as cast aluminum or composite plastic. I opted for a pump with a corrosion-resistant build since my boat operates in saltwater sometimes. A good-quality impeller (usually rubber) is also key because it directly moves the water. I checked that replacements came with a durable impeller included.
Installation Considerations
Replacing the water pump on the Mercruiser 5.7 is doable if you have some mechanical skills, but I recommend having the right tools and a repair manual. Some pumps come as a complete kit with gaskets and seals, which made installation easier for me. Also, I made sure to inspect the pulley and thermostat while I was at it.
Signs You Need to Replace Your Water Pump
I replaced my pump after noticing overheating and unusual noises. Other signs include coolant leaks, low coolant flow, or visible damage to the impeller. Catching these signs early can save you from bigger engine troubles.
Price Range and Warranty
Prices vary widely depending on OEM or aftermarket and included parts. For my Mercruiser 5.7 water pump, I found prices ranging from $80 to $200. I prioritized products with a warranty to protect my investment — many OEM pumps offer at least a 1-year warranty.
Final Tips from My Experience
- Always verify compatibility with your exact engine model and year.
- Consider buying a complete water pump kit for convenience.
- Read customer reviews to gauge real-world reliability.
- Don’t delay replacing a failing water pump to avoid costly engine damage.
I hope this guide helps you choose the best water pump for your Mercruiser 5.7 and keeps your boating season worry-free!
Author Profile
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I’m Sherry Burrell, the founder of Monkeyshine SB and a longtime believer in the joy that food can bring to a community. Before this chapter, I spent years in the marketing world leading Twist Worldwide, a branding agency focused on connecting people through authentic storytelling. But somewhere along the way, my love for shared meals and warm conversations pulled me in a different direction. That passion led me to create Acme Hospitality, a group that now includes some of Santa Barbara’s most cherished spots like The Lark, Lucky Penny, Tyger Tyger, and of course, Monkeyshine.
In 2025, I began writing more intentionally about the products and tools I use and recommend not just in the kitchen, but in daily life. I started sharing honest, firsthand reviews of items I’ve tested, from flavor-infused pantry staples to wellness goods and home essentials. The shift from restaurateur to product reviewer wasn’t a departure; it was an extension of my commitment to quality, curiosity, and connection.
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