Thermostat Kit (140°F/60°C) – Fits MerCruiser 2.5L & 3.0L Stern Drives (Replaces 59078Q3, 18-3650) family-yamaha-70tlry Place a rag or container

Place a rag or container under the connection point to catch any residual fuel

tightening the screws evenly in a crisscross pattern to ensure a good seal

Ensure they are correctly seated in their grooves

offering a 3-7 year warranty against UV-related fading and resistance to salt water

Using it on other models may result in improper fit

Thermostat Kit (140°F/60°C) – Fits MerCruiser 2.5L & 3.0L Stern Drives (Replaces 59078Q3, 18-3650) family-yamaha-70tlry Place a rag or containerThermostat Kit (140F 60C) Fits MerCruiser 2. 5L & 3. 0L Stern Drives This thermostat kit is designed for MerCruiser 2. 5L (120HP) and 3. 0L (140HP) inline 4 cylinder and 6 cylinder GM engines (1998 and newer) equipped with cast iron exhaust manifolds. It serves as a direct replacement component for maintaining optimal engine operating temperature. Engineered to match OEM specifications, this kit directly replaces MerCruiser part numbers 59078Q3,