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180 Degree Thermostat Kit | Sierra 18-3666 SEI HYDRAULICS ARCO consistently tests and retests180 Degree Thermostat Kit Sierra 18 3666 180 degree thermostat kit used on various Volvo AQ model marine engines. Fits Volvo Penta AQ120B engines from 1977 to 1980 Fits Volvo Penta AQ140A engines from 1975 to 1979 Fits Volvo Penta AQ145A and AQ145B engines from 1979 to 1985 Fits Volvo Penta AQ171A and AQ171C engines from 1986 to 1989 Fits Volvo Penta 230A and 230C engines from 1989 to 1993 Kit includes 180 degree thermostat and 18 2933 sealing ring