SeaSierra
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383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L
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383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L
Ensure smooth sailing with the Maintenance Thermostat Kit designed for OMC Cobra and Volvo Penta Engine Drives.
383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L
Item #: 126108712

383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L

Item #: 126108712

GYD 5765

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Ensure smooth sailing with the Maintenance Thermostat Kit designed for OMC Cobra and Volvo Penta Engine Drives.
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What Stands Out

Universal Compatibility
Designed to fit a variety of OMC Cobra and Volvo Penta models, ensuring seamless integration with both GM and Ford engines for versatile application in stern drives and outdrives.
High-Temperature Rating
Operates effectively at 160º F, providing optimal engine cooling performance, thereby enhancing the longevity and efficiency of your marine engine under demanding conditions.
Complete Kit
Includes essential gasket for a hassle-free replacement process, ensuring a tight seal and preventing leaks, thus offering peace of mind and enhancing overall engine performance.

Product Details

Shop 383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L online at a best price in Guyana. B0DD3BRFB3

Who Should Buy?

Suitable For
  • Marine Technicians

    Ideal for professionals maintaining or repairing marine engines needing reliable thermostat replacements for optimal performance.

  • Boating Enthusiasts

    Great for boat owners who perform their own maintenance and seek affordable, quality replacement parts for their engines.

  • Engine Upgrades

    Suitable for those upgrading their engines to improve efficiency and cooling capabilities in marine applications.

Not Suitable For
  • Casual Boaters

    Not suitable for occasional boat users who may prefer simpler, less technical maintenance solutions without detailed installations.

Product Description

383307 Thermostat Kit for OMC Cobra Volvo Penta 4.3 5.0 5.7 5.8 L

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the purpose of the 383307 Thermostat Kit?

    Answer: The 383307 Thermostat Kit is designed to regulate the engine temperature in marine applications, specifically compatible with OMC Cobra, Volvo Penta, and various GM and Ford engines. By maintaining optimal operating temperatures, this thermostat helps prevent overheating, ensuring engine efficiency and longevity. Proper temperature regulation is crucial during both high-speed cruising and idling, making this component essential for reliable engine performance in different marine conditions.
  • Question: Which engines are compatible with the 383307 Thermostat Kit?

    Answer: The 383307 Thermostat Kit is compatible with a range of engines, including Volvo Penta 4.3-5.8 L V6 and V8 engines, OMC Cobra models, and other GM and Ford configurations. This wide compatibility makes it a versatile component for various stern drive systems. Whether you're replacing a faulty thermostat in a recreational boat or a commercial vessel, this kit ensures that your engine maintains the proper temperature for optimal performance.
  • Question: How do I install the 383307 Thermostat Kit?

    Answer: Installing the 383307 Thermostat Kit involves a few key steps. Start by ensuring that the engine is cool and disconnect the battery. Remove the thermostat housing and old thermostat, then place the new thermostat from the kit along with the provided gasket into its designated position. Reattach the housing and reconnect the battery. It's crucial to check for leaks after installation and monitor the engine's temperature during initial run-time to ensure proper operation.
  • Question: What materials are used in the construction of the 383307 Thermostat?

    Answer: The 383307 Thermostat is constructed from high-quality materials, allowing it to withstand harsh marine environments. The design typically includes a brass or stainless steel body, which provides corrosion resistance, and a reliable silicone sealing component that ensures a tight fit. This durable construction ensures long-term performance and reliability, making it a trusted choice for boat owners looking to maintain their engine's health in demanding conditions.
  • Question: How can I tell if my thermostat is failing?

    Answer: Signs of a failing thermostat include persistence in overheating, fluctuating engine temperatures, or steam and excessive coolant discharge. If you experience slow engine warm-up or notice the engine temperature gauge fluctuating erratically, it may indicate an issue with the thermostat. Regular checks and monitoring engine performance can help you catch these issues early, preventing possible damage and costly repairs.
  • Question: What is the significance of using a gasket with the thermostat?

    Answer: Using a gasket with the thermostat is crucial to prevent coolant leaks between the thermostat housing and engine block. A proper gasket ensures a tight seal, maintaining the system's pressure and efficiency. This helps to enhance engine performance by ensuring an accurate flow of coolant, thus preventing overheating and engine damage. Always replace the gasket when installing a new thermostat to ensure maximum reliability.
  • Question: Can I use the 383307 Thermostat Kit for freshwater and saltwater applications?

    Answer: Yes, the 383307 Thermostat Kit is suitable for both freshwater and saltwater applications. Its robust construction is designed to resist corrosion, making it a reliable choice for vessels operating in various water conditions. Using this thermostat in saltwater environments requires regular maintenance checks to ensure there is no build-up of salt or debris affecting the cooling system's efficiency.
  • Question: What temperature does the 383307 Thermostat operate at?

    Answer: The 383307 Thermostat operates at a temperature of 160°F (71°C), which is ideal for efficient engine operation. This temperature ensures that the engine warms up quickly while preventing overheating under heavy loads. It's critical for performance in both idle and full throttle scenarios, allowing for optimal fuel efficiency and reducing emissions.
  • Question: Where can I buy the 383307 Thermostat Kit in Guyana?

    Answer: You can purchase the 383307 Thermostat Kit with gasket from Ubuy in Guyana. Ubuy offers a wide range of marine products, including this essential kit for your engine's cooling system. Their easy navigation and secure purchasing options make it a convenient choice for boat enthusiasts looking to replace vital components.
  • Question: Is it necessary to have a professional install the thermostat kit?

    Answer: While it's possible for experienced DIYers to install the 383307 Thermostat Kit themselves, consulting a professional is advisable for those unfamiliar with marine engine maintenance. A professional can ensure proper installation and check adjacent components for any related issues, which can save time and prevent future problems. This is especially important for high-performance boats where precise engine management is crucial.

SeaSierra Thermostats Editorial Review

**Editorial Review of the SeaSierra 383307 Thermostat Kit** The SeaSierra 383307 Thermostat Kit has garnered positive attention from marine engine owners looking to improve the performance of their OMC and Volvo Penta stern drives. Users frequently highlight the kit's compatibility with various engine models, namely the 4.3-5.8 L V6 and V8 GM and Ford engines, which makes it a versatile option for a broad range of boating enthusiasts. Installation is a breeze, as many customers praise the clear instructions and straightforward process, allowing users to effectively replace their old thermostat with minimal fuss. The inclusion of a gasket further enhances the kit's value, ensuring a complete solution for maintaining optimal engine temperature. Performance-wise, users report that the SeaSierra thermostat kit leads to noticeable improvements in engine cooling efficiency. This is particularly critical in marine environments where overheating can lead to serious engine damage. The fact that this thermostat operates reliably and maintains Consistent temperatures under various conditions has been a significant point of praise. Despite the overall positive reception, a few users raised minor concerns regarding longevity, with some noting that they've had to replace the unit sooner than expected. However, these instances appear to be exceptions rather than the rule, with the majority enjoying satisfactory longevity and performance. In summary, the SeaSierra 383307 Thermostat Kit is well-loved by boat owners for its easy installation, effective performance, and strong compatibility with a range of popular marine engine models. It delivers on its promises, making it a reliable choice for anyone looking to enhance their stern drive's functionality. **

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Pros

  • Compatible with a range of GM and Ford engines (4.3-5.8 L V6 and V8)
  • Easy installation with clear instructions
  • Includes gasket for comprehensive replacement
  • Improves engine cooling efficiency

Cons

  • Some reports of shorter lifespan than expected

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9 September 2026 · via Trustpilot
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“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

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GYD 5765

Order now and get it around Monday, October 12

QTY:

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Features & Benefits

  • Compatible with OMC Cobra and Volvo Penta engine drives.
  • Fits most 4.3L, 5.0L, 5.7L, and 5.8L Ford and GM based V6 and V8 engines.
  • Temperature rating of 160°F / 71°C for optimal performance.
  • Replaces various thermostat kits including 383307 and 3856961.
  • Important to compare with your old thermostat before ordering.
  • Contact us for assistance to ensure compatibility.

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