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Sierra® Thermostat Kit for Mercruiser® 140 / 3.0L Engines, 1968-1989.
Proper thermostat operation is key in getting peak performance and maximum fuel efficiency! This marine-grade Kit will withstand the rigors of "ugly" brackish and saltwater.
Sierra® Thermostat Kit (part no. 18-3650) includes thermostat and gasket to replace your original thermostat kit (O.E.M. 59078Q3).Kit includes:
- Thermostat (part no. 18-3550)- replaces O.E.M. part no. 59078
- Thermostat gasket (part no. 2831)-replaced O.E.M. part no. 27-47590-1.