Description
Mercury 59078T3 Thermostat Kit
The Mercury 59078T3 thermostat kit is a genuine OEM replacement designed for 1998 and older MerCruiser GM inline 4 and 6-cylinder engines. Built to help regulate proper engine operating temperature, this thermostat kit supports dependable cooling system performance and reliable marine engine operation. It includes the thermostat and cork thermostat gasket for convenient service and replacement.
Key Features
- Genuine Mercury Precision thermostat kit
- Part number: 59078T3
- Fits 1998 and older MCM GM inline 4 and 6-cylinder engines
- Includes thermostat and cork thermostat gasket
- Helps regulate engine operating temperature
- Easy to replace with common tools
Fitment
- Fits 1998 and older MerCruiser MCM GM inline 4-cylinder engines
- Fits 1998 and older MerCruiser MCM GM inline 6-cylinder engines
- Designed for older General Motors-based MerCruiser engine applications
- Genuine OEM replacement kit
Product Details
- Brand: Mercury Precision
- Manufacturer part number: 59078T3
- UPC: 745061028777
- Product type: Thermostat kit
- Includes thermostat and cork gasket
- Country of origin: US
Package Dimensions
- Length: 7.1 in
- Width: 3.15 in
- Height: 2.85 in
- Weight: 0.143 lb
Why You Should Buy
- Helps protect your engine by properly regulating operating temperature
- OEM design supports proper fit, function, and performance
- Convenient kit includes the thermostat and cork gasket needed for service
- Easy replacement using common tools
Common Applications
Commonly used for cooling system service on 1998 and older MerCruiser MCM GM inline 4 and inline 6-cylinder marine engines.
FAQ
What does this kit include?
This kit includes the thermostat and a cork thermostat gasket.
What engines does this fit?
It fits 1998 and older MerCruiser MCM GM inline 4 and 6-cylinder engines.
Is this a genuine Mercury OEM part?
Yes, Mercury 59078T3 is a genuine Mercury Precision thermostat kit.
Is this hard to install?
It is designed to be easy to replace with common tools. Always follow your owner's manual for removal and installation procedures.




