2001 Mercury Mariner 50-60HP Factory Service Manual, Page 19Get this manual
MAINTENANCE
After Each Use
1Flush out the outboard cooling system if operating in salt or polluted water2Wash off all salt deposits and flush out the exhaust outlet of the propeller and gear case with fresh water if operating in salt water
Every 100 Hours of Use or Once yearly, Whichever occurs first
1Lubricate all lubrication pointsLubricate more frequently when used in salt water2Change engine oil and replace the oil filterThe oil should be changed more often when the engine is operated under adverse conditions such as extended trolling3Inspect thermostat visually for corrosion, broken spring, and to determine that the valve is completely closed at room temperatureIf questionable, inspect thermostat as outlined in Section 4B "Thermostat"4Inspect and clean spark plugs5Check engine fuel filter for contaminants6Adjust carburetor(s) (if required)7Check engine timing setup8Check corrosion control anodesCheck more frequently when used in salt water9Drain and replace gear case lubricant10Lubricate splines on the drive shaft11Check and adjust valve clearance, if necessary12Check power trim fluid13Inspect battery14Check control cable adjustments15Inspect timing belt16Remove engine deposits with Quicksilver Power Tune Engine Cleaner17Check tightness of bolts, nuts, and other fasteners