Sierra 18-3550 Thermostat-MerCruiser 140 Degrees-MerCruiser

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Used on raw water cooled engines. Replaces Mercruiser #59078. Used on Models: -120 - 1964 to 1986 -140 - 1968 to 1986 -165 - 1970 to 1981 -2.5L - 1987 to 1989 -3.0L - 1987 to 1994 -3.0L - 1998 -3.0LX - 1990 to 1997 Show more