140 Degree Thermostat Kit | Sierra 18-3650

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