Description

Mercury MerCruiser / Quicksilver Thermostat Assembly – 8M0174561

Maintain proper engine cooling and operating temperature with the genuine Mercury Marine / Quicksilver 8M0174561 Thermostat Assembly. This OEM thermostat assembly regulates coolant flow through the engine, helping the engine reach and maintain the correct operating temperature for optimal performance and efficiency.

The assembly includes a 140°F (60°C) thermostat housed in a corrosion-resistant composite thermostat housing, designed for durability and long service life in marine environments.

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Key Features

• Genuine Mercury / Quicksilver OEM thermostat assembly

• 140°F thermostat maintains correct engine operating temperature

• Durable high-temperature composite housing with corrosion resistance

• Integrated stainless-steel thermostat element for reliable operation

• Designed for direct replacement installation in compatible Mercury engines

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Part Details

• OEM Part Number: 8M0174561

• UPC: 745061633704

• Thermostat Rating: 140°F

• Product Type: Thermostat and housing assembly

Supersedes

• 892864T04 (earlier Mercury part number)

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Compatible Mercury Engines

Commonly used on Mercury Verado FourStroke outboard engines, including:

• 135 HP EFI Verado (4-cylinder)

• 150 HP EFI Verado (4-cylinder)

• 175 HP EFI Verado (4-cylinder)

• 200–300 HP Verado (6-cylinder)

• 350–400 HP Verado (2.6L L6)

• 400R Racing engines

Compatibility depends on engine model and serial number range.

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Function

The thermostat controls coolant flow within the engine. When the engine is cold, it remains closed to allow the engine to warm up quickly. Once operating temperature is reached, the thermostat opens to circulate cooling water and prevent overheating.

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Important Compatibility Note

Thermostat assemblies vary depending on engine family, cooling system configuration, and serial number range. Always verify compatibility using the engine serial number before ordering to ensure the correct replacement part.

Shipping: Ships same or next day for fast Canada wide shipping.