Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 129Get this manual

Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 129

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Thermostats 1 Inspect thermostat covers and cylfnderhead covers (thermostat opening) for cracks and corrosion damage that could cause leakageReplace parts as necessary
Continue to heat water unt