140 Degree Thermostat Kit | Sierra 18-3650

140 degree thermostat fits multiple Mercruiser raw water cooled 4 cylinder marine engines.

• Fits Mercruiser model 120 153CID raw water cooled engines from 1968 to 1972 with serial number range 2324347 to 3377340
• Fits Mercruiser 2.5L 153 CID raw water cooled engines from 1987 to 1989 with serial number range B531854 to C853255
• Fits Mercruiser 3.0L 181 CID raw water cooled engines from 1987 to 1989 with serial number range B450801 to C856558
• Kit includes 18-3550 140 degree thermostat and 18-2831 housing gasket
• Replaces Mercury 59078
• Replaces Mallory 9-43020, 9-43153