Description
Mercury-MerCruiser 991551T1 160°F Thermostat Kit
The Mercury-MerCruiser 991551T1 Thermostat Kit is designed for 1998 and newer MerCruiser marinized V6 and V8 engines made by General Motors that use closed cooling systems and require a 160°F thermostat. This kit includes the thermostat and seal needed for replacement during cooling system service.
A properly functioning thermostat helps regulate engine operating temperature and supports reliable cooling system performance. Replacing a worn, stuck, or non-functioning thermostat can help restore proper temperature control in compatible MerCruiser applications.
Product Features:
- 160°F thermostat kit for compatible MerCruiser applications
- Designed for 1998 and newer GM V6 and V8 MerCruiser marinized engines
- For engines using closed cooling systems that require a 160°F thermostat
- Includes thermostat and seal
- Can be replaced with common tools
- Manufactured to Mercury Marine OEM specifications
Product Details:
- Brand: Mercury / MerCruiser
- Manufacturer Part Number: 991551T1
- Part Type: Thermostat Kit
- Temperature Rating: 160°F
- Cooling System Type: Closed cooling
- Engine Application: 1998 and newer GM V6 and V8 MerCruiser marinized engines
- Includes: Thermostat and seal
Installation Note: Refer to your owners manual or service manual for removal of the non-functioning thermostat and installation of the replacement thermostat.
Fitment Note: This thermostat kit is for compatible MerCruiser GM V6 and V8 engines with closed cooling systems requiring a 160°F thermostat. Please verify fitment by engine serial number, cooling system type, parts diagram, or existing part number before purchasing.
