Description
Mercury 807252T4 140°F Thermostat Kit for MerCruiser V6 and V8 Engines
The Mercury 807252T4 thermostat kit is a genuine Mercury Precision 140°F replacement thermostat kit for compatible MerCruiser sterndrive and inboard engines with standard cooling systems. This kit is used to help regulate engine operating temperature and includes the thermostat, o-rings, and gaskets needed for thermostat service on approved applications.
Key Features
- Genuine Mercury Precision thermostat kit
- Part number: 807252T4
- 140°F thermostat temperature rating
- Designed for compatible MerCruiser standard cooling systems
- Fits select GM V6 and V8 sterndrive and inboard engines
- Also fits select newer MerCruiser 4.5L and 6.2L engines with standard cooling
- Includes thermostat, o-rings, and multiple gaskets
- Service replacement can be completed with common tools
Fitment
- Fits 1983-2016 GM V6 and V8 MerCruiser engines with standard cooling requiring a 140°F thermostat
- Fits V6 and V8 sterndrive and inboard engines built with standard cooling systems from General Motors
- Fits 2015 and newer MerCruiser 4.5L engines with standard cooling
- Fits 2015 and newer MerCruiser 6.2L engines with standard cooling
- Does not fit high performance engine applications
- Verify fitment by engine model, serial number, and cooling system configuration before ordering
Why You Should Buy
- OEM Mercury kit built for proper fit, function, and marine cooling system performance
- Helps maintain correct engine operating temperature on compatible MerCruiser engines
- Includes the key sealing components commonly needed during thermostat replacement
- Good service item for overheating, low-temperature operation, or routine cooling system maintenance
Common Applications
- MerCruiser V6 thermostat replacement
- MerCruiser V8 thermostat replacement
- MerCruiser 4.5L standard cooling thermostat service
- MerCruiser 6.2L standard cooling thermostat service
- Sterndrive and inboard cooling system maintenance
- Standard cooling system repair and inspection
FAQ
- What temperature is this thermostat? This Mercury thermostat kit uses a 140°F thermostat.
- What is included in the kit? The kit contains a thermostat, o-rings, and multiple gaskets.
- Does this fit GM V6 and V8 MerCruiser engines? Yes, it fits compatible GM V6 and V8 MerCruiser sterndrive and inboard engines with standard cooling requiring a 140°F thermostat.
- Does this fit newer 4.5L and 6.2L MerCruiser engines? Yes, it fits select 2015 and newer MerCruiser 4.5L and 6.2L engines with standard cooling.
- Will this fit high performance engines? No, this application excludes high performance engines.

