JOHNSON EVINRUDE OMC 5030742 Thermostat 745419261276

( Brand: Johnson Evinrude Omc ), ( Manufacturer Part Number: 5030742 ), ( Part Type: Thermostat ), ( Warranty: 30 Day ), ( Country Of Origin: Japan ), ( UPC: 745419261276 )

Review JOHNSON EVINRUDE OMC Thermostat 50 Degrees

The **Johnson Evinrude OMC 5030742 Thermostat 50** is a precision-engineered temperature control component specifically designed for marine outboard engines, ensuring optimal performance, fuel efficiency, and longevity in demanding aquatic environments. Part of the trusted OMC (Outboard Marine Corporation) lineup, this thermostat is meticulously crafted to regulate coolant flow within the engine s cooling system, maintaining an ideal operating temperature typically between 160 F and 195 F regardless of external conditions or workload. Constructed from high-grade materials, including a durable aluminum housing and a robust stainless-steel or bronze valve assembly, this thermostat is engineered to withstand the corrosive effects of saltwater, freshwater, and harsh marine climates, making it an indispensable component for both recreational and professional boating applications. The **50** designation indicates its compatibility with engines requiring a specific temperature range, ensuring seamless integration with models like the Evinrude E-TEC, E-TEC HP, or other high-performance outboards that demand precise thermal management. With a spring-loaded valve mechanism, the thermostat automatically adjusts coolant circulation, preventing overheating during peak loads while minimizing wear during idle or low-speed operation. Its compact yet robust design allows for easy installation within the engine s water jacket, where it plays a critical role in balancing thermal efficiency with mechanical reliability. Whether deployed in a sleek fishing vessel, a high-speed cruiser, or a workboat navigating rough waters, this thermostat exemplifies OMC s commitment to innovation and durability, ensuring that your outboard engine operates at peak performance with minimal maintenance demands. For boaters who prioritize performance, longevity, and adaptability, the **Johnson Evinrude OMC 5030742 Thermostat 50** is an essential upgrade or replacement part that delivers both confidence and consistency on the water.

### **Pros and Cons of buying a Johnson/Evinrude OMC 5030742 Thermostat (50 HP E-TEC/E-TEC HP2 Engine)**

1. **Direct OEM Replacement** This part is manufactured by OMC (Outboard Marine Corporation), the same company that produces the engine it s designed for. This ensures a perfect fit, reducing the risk of compatibility issues or performance problems.

2. **Reliability and Durability** OMC parts are known for their quality and longevity, especially in marine applications where engines operate under demanding conditions. A genuine thermostat is less likely to fail prematurely compared to aftermarket alternatives.

3. **Warranty Coverage** If purchased new from an authorized dealer or directly from OMC, this part may come with a warranty, providing peace of mind against defects.

4. **Performance Consistency** The thermostat regulates engine temperature precisely, preventing overheating and ensuring optimal fuel efficiency and power output. A faulty thermostat can lead to engine damage, so a reliable one is critical.

5. **Ease of Installation** Since it s an OEM part, installation instructions are typically straightforward, and it s designed to integrate seamlessly with the engine s cooling system.

6. **Compatibility with Aftermarket Upgrades** If you ve modified your engine (e.g., with a performance water pump or upgraded cooling system), a high-quality OEM thermostat ensures compatibility without compromising performance.

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1. **Higher Cost** Compared to aftermarket or generic thermostats, the OMC part is more expensive. For budget-conscious buyers, this may be a significant drawback, especially if the engine is older or the thermostat is only needed for short-term use.

2. **Limited Availability** Depending on the region or dealer, finding this specific part may require ordering online or waiting for stock. Some local marine supply stores may not carry OMC parts exclusively.

3. **Potential Overkill for Minor Use** If the engine is rarely used (e.g., a seasonal boat), the premium price of an OMC thermostat might not justify the investment, as aftermarket options could suffice.

4. **No Additional Features** Unlike some aftermarket thermostats, this OEM part does not include extra benefits such as extended warranties, temperature sensors, or compatibility with diagnostic tools.

5. **Risk of Counterfeit Parts** If purchasing from a third-party seller (e.g., eBay, Amazon, or unverified online marketplaces), there s a chance of receiving a fake or low-quality replica. Always buy from authorized dealers to avoid this.

6. **Replacement Complexity for DIYers** While not overly difficult, replacing a thermostat requires draining the cooling system, which can be messy and time-consuming. Those uncomfortable with engine work may prefer professional installation.

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The **Johnson/Evinrude OMC 5030742 Thermostat** is a high-quality, reliable choice for owners of compatible 50 HP E-TEC/E-TEC HP2 engines. Its OEM status guarantees compatibility, performance, and longevity, making it ideal for serious boaters who prioritize durability and engine protection. However, the higher cost and potential availability issues may deter budget-conscious or casual users.

If your primary concern is **long-term reliability and engine protection**, this is the best option. If you re looking to **save money** and the engine isn t heavily used, a reputable aftermarket thermostat (e.g., from brands like **Mercury Marine, Seafoam, or Marine Parts Online**) could be a viable alternative just ensure it meets OMC specifications.

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- You own a **50 HP E-TEC/E-TEC HP2 engine** and need a **direct replacement** for optimal performance.

- You prioritize **long-term reliability** and are willing to pay for a **genuine part**.

- You plan to **keep the engine for years** and want to avoid potential issues from inferior aftermarket parts.

- You re on a **tight budget** and the engine isn t used frequently.

- You ve verified that a **high-quality aftermarket thermostat** (e.g., **Mercury Marine #5030742 or equivalent**) meets OMC specs.

- You re comfortable with **DIY installation** and can source the part from a trusted supplier.

**Final Tip:** Always cross-reference the part number with your engine s manual to confirm compatibility. If possible, purchase from an **authorized OMC dealer** or a well-reviewed online retailer to avoid counterfeit products.

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part #: 5030742 prices

• $22.99-$25.99

specifications ouboaen:

• for makes: Johnson
• brand: Johnson Evinrude Omc
• mpn: 5030742
• part type: Thermostat
• warranty: 30 Day
• country of origin: Japan
• upc: 745419261276

offer ouboaen:

• started: March 14, 2026
• options: Ship-to-home
• sold: 0
• best offers: True
• quantity: 1
• availability: In Stock

seller ouboaen:

• city: Plainwell, Michigan
• rating: 99.9%
• # reviews: 30296

payments ouboaen:

• wallet: Google-pay
• other
• credit card: Mastercard

returns ouboaen:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

general ouboaen:

• Boat Parts > Outboard Engines Components > Other
• condition: New other see details

shipping ouboaen:

• transit: 4-7 Days
• carrier: USPS
• service: USPS Ground Advantage, USPS Priority Mail
• class: Standard, Expedited
• cost: $7.95
• type: Calculated

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