SIERRA 140°F Mercury/Mariner 25-40 HP Thermostat Kit – 18-3642

Description

SIERRA 140°F Mercury/Mariner 25-40 HP Thermostat Kit – 18-3642

The SIERRA 140°F Mercury/Mariner 25-40 HP Thermostat Kit – 18-3642 is a marine cooling-system replacement component designed for Mercury/Mariner 25-40 HP 3-cylinder outboards using OEM 825212-series thermostat kits. Its 140°F (60°C) operating rating helps the engine reach and maintain the intended cooling-system temperature. It is a fit-specific service part; confirm the engine model, serial range, cooling configuration, and OEM interchange before installation.

• Designed for Mercury/Mariner 25-40 HP 3-cylinder outboards using OEM 825212-series thermostat kits
• Thermostat temperature rating: 140°F (60°C)
• Service kit groups the thermostat and/or required sealing components for cooling-system maintenance
• Helps restore correct engine warm-up and operating-temperature control
• Fit-specific design reduces guesswork during scheduled cooling-system service

Specifications

• Manufacturer: Sierra
• Part Number: 18-3642
• Product Type: Thermostat Kit
• Application: Mercury/Mariner 25-40 HP 3-cylinder outboards using OEM 825212-series thermostat kits
• Temperature Rating: 140°F (60°C)
• OEM / Aftermarket Interchange: Mercury Marine 825212001, 825212A1, 855676A1