Inspection And Maintenance Schedule; Flushing The Cooling System - Mercury 150 Manual

Inspection And Maintenance Schedule

BEFORE EACH USE
• Check that the lanyard stop switch stops the engine.
• Visually inspect the fuel system for deterioration or leaks.
• Check outboard for tightness on transom.
• Check steering system for binding or loose components.
• Visually check steering link rod fasteners for proper tightness. See Maintenance - Steering Link
Rod Fasteners.
• Check propeller blades for damage.
AFTER EACH USE
• Flush out the outboard cooling system if operating in salt or polluted water. See Flushing the
Cooling System.
• Wash off all salt deposits and flush out the exhaust outlet of the propeller and gearcase with fresh
water if operating in salt water.
EVERY 100 HOURS OF USE OR ONCE YEARLY, WHICHEVER OCCURS
FIRST
• Lubricate all lubrication points. Lubricate more frequently when used in salt water. See Lubrication
Points.
• Replace spark plugs at first 100 hours or first year. After that, inspect spark plugs every 100 hours
or once yearly. Replace spark plugs as needed. See Spark Plug Inspection and Replacement.
• Replace water separating fuel filter. See Fuel System.
• Check corrosion control anode. Check more frequently when used in salt water. See Corrosion
Control Anodes.
• Drain and replace gearcase lubricant. See Gearcase Lubrication.
•
Lubricate splines on the drive shaft and shift shaft.
• Check power trim fluid. See Checking Power Trim Fluid.
• Inspect battery. See Battery Inspection.
•
Check control cable adjustments.
• Check tightness of bolts, nuts, and other fasteners.
• Replace water pump impeller (more often if overheating occurs or reduced water pressure is
1.
noted.)
BEFORE PERIODS OF STORAGE
Refer to Storage procedure. See Storage section.

Flushing The Cooling System

Flush the internal water passages of the outboard with fresh water after each use in salt, polluted, or
muddy water. This will help prevent a buildup of deposits from clogging the internal water passages.
NOTE: Engine can be stopped or running at idle speed when flushing the cooling system. Do not flush
engine using a water system that exceeds 310.26 kPa (45 psi)
1. These items should be serviced by an authorized dealer.
MAINTENANCE
1.
1.
34