Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 319Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 319

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POWERHEAD
1 Inspect thermostat covers and cylinder head covers (thermostat opening) for cracks and corrosion damage that could cause leakageReplace parts as necessary2 Remove and discard gasket