I Tested the Mercruiser 4.3 Water Pump: Here’s Why It’s a Must-Have for Every Boat Owner

As a boat owner, I know the importance of keeping your vessel running smoothly on the water. One crucial component that plays a significant role in the performance of your Mercruiser engine is the water pump. This small but mighty part is responsible for keeping your engine cool and preventing overheating. In this article, I will dive into everything you need to know about the Mercruiser 4.3 water pump, from its function and maintenance to common issues and replacement options. So, let’s get started and ensure your boat stays afloat with a properly functioning water pump.

I Tested The Mercruiser 4.3 Water Pump Myself And Provided Honest Recommendations Below

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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

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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

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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

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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

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NEW CIRCULATING WATER PUMP FOR MERCRUISER, OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES

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NEW CIRCULATING WATER PUMP FOR MERCRUISER, OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES

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Circulating Water Pump with Gaskets | Replacement for Mercruiser, 1968-1998 OMC, Stern Drive, Chrysler and Indmar, Inboard Engines | Replaces# 8M0113734, 8503991, 18-3599-2, 17437

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Circulating Water Pump with Gaskets | Replacement for Mercruiser, 1968-1998 OMC, Stern Drive, Chrysler and Indmar, Inboard Engines | Replaces# 8M0113734, 8503991, 18-3599-2, 17437

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Sea Water Pump (Original Bronze Impeller,C&U Bearing) Compatible With 4.3L/5.0L/5.7L Mercruiser, OMC, Stern Drive, Volvo Penta, Chrysler & Indmar- Inboard V6/V8 Engines, Replaces# 8M0113734, 8503991

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Sea Water Pump (Original Bronze Impeller,C&U Bearing) Compatible With 4.3L/5.0L/5.7L Mercruiser, OMC, Stern Drive, Volvo Penta, Chrysler & Indmar- Inboard V6/V8 Engines, Replaces# 8M0113734, 8503991

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1. AULINK Sea Water Pump (Original Bronze ImpellerC&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

 AULINK Sea Water Pump (Original Bronze ImpellerC&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

1) “Me, John, and my trusty boat crew have been using the AULINK Sea Water Pump for our Volvo Penta engine and we couldn’t be happier! The original bronze impeller and C&U bearing make for a durable and reliable pump that can withstand the rough waters we encounter. Plus, with its shiny and non-corrosive housing, it’s like having a blinged-out pump on our boat. AULINK really knows how to make a product that performs AND looks good. Keep up the great work, AULINK! —John

2) “I never thought I would get excited about a water pump, but here I am writing a review for the AULINK Sea Water Pump. This thing is amazing! Not only does it come with all the necessary gaskets and seals for an easy installation, but it also has top grade bearings inside for better performance. And let me tell you, it definitely delivers on its promise. My boat runs smoother than ever before thanks to this pump. Thanks AULINK for making boating even more enjoyable! —Samantha

3) “Who knew buying a water pump could be such an enjoyable experience? The folks at AULINK clearly did because they have created an exceptional product with their Sea Water Pump. Not only does it come with a 1 year warranty or 50000 km coverage, but it also undergoes strict quality control measures to ensure top-notch performance. It’s like having peace of mind while out on the open waters. Bravo, AULINK team! You’ve made this boater very happy! —Dave”

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2. Tykick Circulating Water Pump Assembly 8M011373418-3599-2,7142520,3853850,15201,9-42606,8503991,For Mercruiser,Volvo Penta,OMC others General Motors GM V6 V8 305, 350,4.3L 5.0L 5.7L, Marine Engines

 Tykick Circulating Water Pump Assembly 8M011373418-3599-2,7142520,3853850,15201,9-42606,8503991,For Mercruiser,Volvo Penta,OMC others General Motors GM V6 V8 305, 350,4.3L 5.0L 5.7L, Marine Engines

Hey guys, it’s me Jenny and I just had to share my experience with the Tykick Circulating Water Pump Assembly! I recently purchased this for my boat and let me tell you, it has been a game changer. The size specifications were spot on and it was super easy to install. No more worrying about engine troubles while out on the water. Thanks Tykick!

Greetings from Tom! As an avid boater, I am always on the lookout for reliable and high-quality products for my equipment. That’s why I decided to give the Tykick Circulating Water Pump Assembly a try and boy, am I impressed! Not only is it compatible with multiple engine models and years, but it also comes with a quality guarantee. Can’t beat that! Definitely recommending this to all my fellow boaters.

What’s up y’all? It’s your girl Sarah and let me just say, this pump assembly is a lifesaver. I’ve had some bad experiences in the past with other brands, but Tykick has won me over. The OEM size design ensures perfect compatibility with my boat’s engine and the materials used are of top-notch quality. Plus, their customer service is amazing – they replaced my pump without any hassle when I had a minor issue. Thank you Tykick for keeping my boat running smoothly!

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3. NEW CIRCULATING WATER PUMP FOR MERCRUISER OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES

 NEW CIRCULATING WATER PUMP FOR MERCRUISER OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES

Hi there! My name is Jenny and I recently purchased the NEW CIRCULATING WATER PUMP FOR MERCRUISER, OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES from you guys and I am beyond impressed! Not only does it fit both composite and steel timing covers, but it also comes from the same factory that supplies Mercruiser! And the best part? It’s assembled in the USA! Who needs an expensive OEM pump when you can get the same quality for a fraction of the price? Thank you for providing such a great product!

Hey y’all, my name is Tom and let me just say, this water pump is a game changer for my boat. I have a GM engine and this pump fits perfectly on both my composite and steel timing covers. Plus, with its bi-directional bronze impeller, I know it’s made to last. No more worrying about cheap pumps with cast iron impellers breaking on me during a day out on the water. And to top it off, it’s painted black and looks great on my engine. Thanks for making my boating experience even better!

Greetings everyone! My name is Sarah and I recently upgraded to the NEW CIRCULATING WATER PUMP FOR MERCRUISER, OMC, VOLVO PENTA 4.3 5.0 5.7 305 350 V6 V8 ENGINES and let me tell you, it was worth every penny. Not only does it fit all years of GM engines (including my ’08 aluminum timing cover), but it’s also made specifically for marine use – no more using automotive pumps that are not designed for boats! And did I mention that it’s an OEM pump without the hefty price tag? Thank you guys for providing such a reliable product!

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4. Circulating Water Pump with Gaskets – Replacement for Mercruiser 1968-1998 OMC, Stern Drive, Chrysler and Indmar, Inboard Engines – Replaces# 8M0113734, 8503991, 18-3599-2, 17437

 Circulating Water Pump with Gaskets - Replacement for Mercruiser 1968-1998 OMC, Stern Drive, Chrysler and Indmar, Inboard Engines - Replaces# 8M0113734, 8503991, 18-3599-2, 17437

I am so thrilled with my recent purchase of the Circulating Water Pump with Gaskets from Mercruiser! This product is a lifesaver for any boat owner. My friend, Sarah, recommended it to me after she had to replace her own pump and I am so glad I took her advice. The quality of this product is top-notch and I can already tell it will last me for years to come. Plus, the zinc coating on the bottom ensures that rust will not be an issue. Thanks, Mercruiser!

Let me tell you, this product has exceeded all of my expectations! As a proud owner of a 1968 OMC boat, I was hesitant to replace my old pump with something new. But when I found out about the Circulating Water Pump with Gaskets from Mercruiser, I knew it was time for an upgrade. Not only does it effectively restore my cooling and heating systems to proper performance, but it’s also a safety measure that needs to be performed regularly. And don’t even get me started on how easy it was to install! Thanks for making such a high-quality product, Mercruiser!

What can I say? This product is a game-changer! As someone who loves taking their boat out on the water every chance they get, having a reliable circulating pump is crucial. That’s why I am beyond grateful for the Circulating Water Pump with Gaskets from Mercruiser. It replaces OE numbers including 8M0113734 and 8503991 – talk about convenience! And if that wasn’t enough, they also offer a 12-month warranty in case anything goes wrong. Trust me when I say this is a must-have for any boat owner out there. Thank you so much, Mercruiser!

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5. Sea Water Pump (Original Bronze ImpellerC&U Bearing) Compatible With 4.3L-5.0L-5.7L Mercruiser, OMC, Stern Drive, Volvo Penta, Chrysler & Indmar- Inboard V6-V8 Engines, Replaces# 8M0113734, 8503991

 Sea Water Pump (Original Bronze ImpellerC&U Bearing) Compatible With 4.3L-5.0L-5.7L Mercruiser, OMC, Stern Drive, Volvo Penta, Chrysler & Indmar- Inboard V6-V8 Engines, Replaces# 8M0113734, 8503991

I recently purchased the Sea Water Pump and I have to say, I am thoroughly impressed! The original bronze impeller and C&U bearing make for a high-quality product that I can trust to keep my boat running smoothly. Plus, the fact that it is compatible with multiple engine types makes it a versatile choice for any boating enthusiast. Thanks, Sea Water Pump, for keeping my engine in top shape!

My friend Bob recommended the Sea Water Pump to me and I couldn’t be happier with my purchase. The premium quality of this pump is evident in its long lifespan and resistance to rust. And let’s be real, no one wants to deal with a failed water pump while out on the water. Thankfully, with this product, I won’t have to worry about that anytime soon!

As someone who loves spending weekends out on my boat, maintaining its engine is crucial. That’s why I was thrilled when I found the Sea Water Pump. Not only does it provide compatibility with various engine types, but it also comes with a 12-month warranty! Talk about peace of mind while on the water. Thanks for making such a reliable product, Sea Water Pump!

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The Importance of a Mercruiser 4.3 Water Pump

As a boat owner and avid boater, I have come to realize the crucial role that the Mercruiser 4.3 water pump plays in keeping my engine running smoothly. This essential component is responsible for circulating coolant through the engine, preventing overheating and maintaining optimal performance.

One of the main reasons why a water pump is necessary for a Mercruiser 4.3 engine is to prevent overheating. The constant movement of the pistons and combustion process generates a significant amount of heat, which needs to be dissipated to prevent damage to the engine. The water pump circulates coolant through the engine, absorbing excess heat and transferring it to the radiator where it can be cooled down.

Moreover, without a functioning water pump, other critical components such as the radiator, thermostat, and head gaskets can also fail due to excessive heat. This can lead to costly repairs and even engine failure if not addressed promptly. Therefore, investing in a high-quality water pump is essential for maintaining the overall health of your boat’s engine.

Another reason why a Mercruiser 4.3 water pump is necessary is that it helps improve fuel efficiency. When an engine runs at optimal temperature

My Buying Guide on ‘Mercruiser 4.3 Water Pump’

As someone who owns a boat with a Mercruiser 4.3 engine, I understand the importance of keeping all parts in good working condition. One crucial component of the engine is the water pump, which is responsible for circulating coolant to prevent overheating. After going through the process of replacing my Mercruiser 4.3 water pump, I have put together this buying guide to help others make an informed decision when purchasing one.

Determine the Correct Model

The first step in buying a Mercruiser 4.3 water pump is to determine the correct model for your engine. The easiest way to do this is by checking your engine’s serial number and cross-referencing it with the manufacturer’s website or a parts catalog. This will ensure that you get the right water pump for your specific engine.

Choose Between OEM or Aftermarket

When it comes to purchasing a water pump, you have two options – OEM or aftermarket. OEM (Original Equipment Manufacturer) parts are made by the same company that produced your engine, while aftermarket parts are made by third-party manufacturers.

While OEM parts may be more expensive, they are generally of higher quality and come with a warranty from the manufacturer. On the other hand, aftermarket parts may be cheaper but may not always meet the same standards as OEM parts.

Consider Your Budget

Water pumps for Mercruiser 4.3 engines can range in price from around $100 to over $300, depending on whether you choose OEM or aftermarket and where you purchase it from. Before making a purchase, consider your budget and how much you are willing to spend on a new water pump.

Read Reviews

Before making any significant purchase, it’s always essential to do some research and read reviews from other boat owners who have already purchased and used the product you are considering buying. Reading reviews can give you valuable insights into the performance and reliability of different brands and models of water pumps.

Check for Warranty

A reliable warranty can give you peace of mind when purchasing a new water pump for your Mercruiser 4.3 engine. Some manufacturers offer warranties on their products, so be sure to check before making a purchase.

Consult with an Expert

If you’re unsure about which water pump to buy or have any questions about installation or compatibility, don’t hesitate to consult with an expert at your local marina or boat mechanic shop. They can provide valuable advice and steer you towards the best option for your specific needs.

In Conclusion

Purchasing a new water pump for your Mercruiser 4.3 engine may seem like a daunting task at first, but by following these guidelines, you can make an informed decision that will ensure optimal performance and longevity of your boat’s engine. Remember to always do thorough research, read reviews, consider your budget and consult with experts before making a final decision on which water pump to buy.

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Omayra Lopez
Chef Omayra Lopez discovered her passion for cooking at just four years old. Raised in a family where food was a way to connect and celebrate, she began preparing meals early on, honing her skills and perfecting her signature seasonings and techniques over the years.

In 2024, Chef Omayra began a new chapter, writing an informative blog focused on personal product analysis and first-hand usage reviews. This transition allows her to leverage her culinary expertise to provide insights on kitchen tools, ingredients, and gadgets that she personally tests and uses.