Mercury – 160°F Thermostat Kit | For V8 MerCruiser Engines | 807252T3

Overview

Keep your classic MerCruiser engine running at its best with the Mercury Marine 807252T3 Thermostat Kit. Designed for 1982 and older V8 MerCruiser sterndrive and inboard engines made by Ford and General Motors, as well as 1996 and older high-performance MerCruiser engines, this kit helps maintain the correct operating temperature for peak efficiency and reliability. Built to Mercury’s exacting standards, the thermostat opens at the right temperature to balance cooling and performance — ensuring your engine stays smooth, strong, and dependable season after season.

Key Features

• Purpose: Regulates cooling flow to keep your engine running at the proper temperature.
• Temperature Rating: Opens at 160°F for optimal balance between performance and protection.
• Compatibility: For 1982 and older Ford/GM-built V8 MerCruiser engines and 1996 and older high-performance MerCruiser models.
• Complete Kit: Includes five pieces — thermostat, flat gasket, rubber gasket, and seals.
• Ease of Installation: Simple replacement with common hand tools; direct OEM fit.

Engine & Boat Compatibility

• V8 MerCruiser sterndrive and inboard engines (1982 and older) made by Ford or General Motors
• High-performance MerCruiser engines (1996 and older) made by Ford or GM

Performance & Real-World Benefits

A properly functioning thermostat ensures your engine maintains a consistent temperature — warming up quickly, running efficiently, and avoiding overheating. The 807252T3 thermostat helps your MerCruiser reach its optimal range of 160°F, giving you smooth throttle response, better fuel economy, and dependable power.

Over time, thermostats can stick, rust, or fail, which can lead to temperature swings or overheating. This Mercury OEM kit restores reliable cooling flow and helps prevent the long-term damage that inconsistent cooling can cause. With all necessary gaskets included, installation is quick and straightforward.

Why Choose Mercury OEM

The Mercury 807252T3 is a genuine OEM thermostat, precision-engineered for MerCruiser cooling systems. Aftermarket thermostats may look similar, but their temperature calibration and fit often vary — leading to unreliable performance.

Mercury’s OEM parts are built for real-world marine use — resisting corrosion, heat, and vibration while maintaining precise temperature control. It’s the same part trusted by Mercury technicians and boat builders worldwide to keep engines running strong and cool.

FAQ

Q1: What engines does this thermostat fit?
It fits 1982 and older V8 MerCruiser engines made by Ford or GM, and 1996 and older high-performance MerCruiser engines.

Q2: What temperature is it rated for?
This thermostat opens at 160°F, maintaining the ideal operating range for MerCruiser engines.

Q3: What’s included in the kit?
The kit includes five components — thermostat, flat gasket, rubber gasket, and seals.

Q4: When should I replace it?
Replace it if your engine overheats, runs too cold, or shows inconsistent temperature readings.

Q5: Why choose Mercury OEM?
Because Mercury OEM thermostats are built to exact temperature specs and engineered for long-lasting reliability in marine conditions.