Mercury Maintenance Schedule

How often should you service your Mercury outboard? Our Mercury Outboard Maintenance Schedule outlines replacement and inspection activity based on “typical” use. Typical use is defined as:

Operating your Mercury outboard at various speeds

Allowing sufficient time for the engine warm-up and cool down

Typical cruising speed near 3000 to 4000 rpm range

Suppose you frequently utilize your Mercury outboard in a more demanding manner than typical use, such as long periods of wide-open throttle or extended periods of trolling. In that case, your service intervals should be shorter. All Mercury outboard parts required for each service interval are available at PartsVu.

Select Your Maintenance Interval

100 Hours/1 Year

ITEM	ACTION(S)
Lanyard Stop Switch	Check
Transom Tightness	Check
Steering System	Check
Steering Link Rod Fasteners	Check
Propeller Blades	Check
Engine Fuel Filter	Check
Engine Timing Setup	Check
Corrosion Control Anode	Check
Valve Clearance	Check
Power Trim Fluid	Check
Battery	Check
Control Cable Adjustments	Check
Timing Belt	Check
Bolts, Nuts, & Other Fasteners	Check
Fuel System	Inspect for Deterioration or Leaks
Thermostat	Inspect for Corrosion or Broken Spring
Grease Points	Lubricate
Splines on the Drive Shaft	Lubricate
Spark Plugs	Check/Replace
Engine Oil	Replace
Oil Filter	Replace
Gear Case Lubricant	Replace

300 Hours/3 Years

ITEM	ACTION(S)
Water Pump Impeller	Check
Lanyard Stop Switch	Check
Transom Tightness	Check
Steering System	Check
Steering Link Rod Fasteners	Check
Propeller Blades	Check
Engine Fuel Filter	Check
Engine Timing Setup	Replace
Corrosion Control Anode	Check
Valve Clearance	Check
Power Trim Fluid	Check
Battery	Check
Control Cable Adjustments	Check
Timing Belt	Check
Bolts, Nuts, & Other Fasteners	Check
Fuel System	Inspect for Deterioration or Leaks
Thermostat	Inspect for Corrosion or Broken Spring
Grease Points	Lubricate
Splines on the Drive Shaft	Lubricate
Spark Plugs	Check/Replace
Engine Oil	Replace
Oil Filter	Replace
Gear Case Lubricant	Replace

100 Hours/1 Year

ITEM
Check: Lanyard Stop Switch
Check: Transom Tightness
Check: Steering System
Check: Steering Link Rod Fasteners
Check: Propeller Blades
Check: Engine Fuel Filter
Check: Engine Timing Setup
Check: Corrosion Control Anode
Check: Valve Clearance
Check: Power Trim Fluid
Check: Battery
Check: Control Cable Adjustments
Check: Timing Belt
Check: Bolts, Nuts, & Other Fasteners
Inspect for Deterioration or Leaks: Fuel System
Inspect for Corrosion or Broken Spring: Thermostat
Lubricate: Grease Points
Lubricate: Splines on the Drive Shaft
Check/Replace: Spark Plugs
Replace: Engine Oil
Replace: Oil Filter
Replace: Gear Case Lubricant

300 Hours/3 Years

ITEM
Check: Water Pump Impeller
Check: Lanyard Stop Switch
Check: Transom Tightness
Check: Steering System
Check: Steering Link Rod Fasteners
Check: Propeller Blades
Check: Engine Fuel Filter
Replace: Engine Timing Setup
Check: Corrosion Control Anode
Check: Valve Clearance
Check: Power Trim Fluid
Check: Battery
Check: Control Cable Adjustments
Check: Timing Belt
Check: Bolts, Nuts, & Other Fasteners
Inspect for Deterioration or Leaks: Fuel System
Inspect for Corrosion or Broken Spring: Thermostat
Lubricate: Grease Points
Lubricate: Splines on the Drive Shaft
Check/Replace: Spark Plugs
Replace: Engine Oil
Replace: Oil Filter
Replace: Gear Case Lubricant

ITEM	ACTION(S)
Engine Starting Condition/Noise	Check
Engine Idle Speed/Noise	Check
Fuel/Oil Leakage	Check
PTT Unit	Check
Pilot Water	Check
Water Inlet	Check
Yamaha Meter/Gauge	Check
Grease Points	Lubricate
Shift Link/Shift Cable	Check/Adjust/Replace
Throttle Link/Throttle Cable	Check/Adjust/Replace
Battery (Electrolyte Level, Terminal)	Check/Adjust/Replace
Cooling Water Leakage	Check/Replace
Fuel Filter (Can Be Disassembled)	Check/Replace
Fuel Line (High Pressure)	Check/Replace
Fuel Line (Low Pressure)	Check/Replace
Propeller/Propeller Nut/Cotter Pin	Check/Replace
Ignition Coils/Ignition Coil Leads	Check/Replace
Engine Start Switch/Engine Shut-Off Switch	Check/Replace
Wiring Harness Connections/Lead Coupler Connections	Check/Replace
Engine Oil	Replace
Gear Oil	Replace

ITEM	ACTION(S)
Cowling Lock Lever	Check
Anodes (External)	Check
Anodes (Cylinder Head Exhaust Passage)	Check
Impeller/Water Pump Housing	Check/Replace
Spark Plugs	Check/Replace
Thermostat	Check/Replace
Timing Belt	Check/Replace
Engine Oil Filter	Replace
Engine Starting Condition/Noise	Check
Engine Idle Speed/Noise	Check
Fuel/Oil Leakage	Check
PTT Unit	Check
Pilot Water	Check
Water Inlet	Check
Yamaha Meter/Gauge	Check
Grease Points	Lubricate
Shift Link/Shift Cable	Check/Adjust/Replace
Throttle Link/Throttle Cable	Check/Adjust/Replace
Battery (Electrolyte Level, Terminal)	Check/Adjust/Replace
Cooling Water Leakage	Check/Replace
Fuel Filter (Can Be Disassembled)	Check/Replace
Fuel Line (High Pressure)	Check/Replace
Fuel Line (Low Pressure)	Check/Replace
Propeller/Propeller Nut/Cotter Pin	Check/Replace
Ignition Coils/Ignition Coil Leads	Check/Replace
Engine Start Switch/Engine Shut-Off Switch	Check/Replace
Wiring Harness Connections/Lead Coupler Connections	Check/Replace
Engine Oil	Replace
Gear Oil	Replace

ITEM	ACTION(S)
Fuel Pump	Check/Replace
Impeller/Water Pump Housing	Replace
Cowling Lock Lever	Check
Anodes (External)	Check
Anodes (Cylinder Head Exhaust Passage)	Check
Engine Starting Condition/Noise	Check
Engine Idle Speed/Noise	Check
Fuel/Oil Leakage	Check
PTT Unit	Check
Pilot Water	Check
Water Inlet	Check
Yamaha Meter/Gauge	Check
Grease Points	Lubricate
Shift Link/Shift Cable	Check/Adjust/Replace
Throttle Link/Throttle Cable	Check/Adjust/Replace
Battery (Electrolyte Level, Terminal)	Check/Adjust/Replace
Spark Plugs	Check/Replace
Thermostat	Check/Replace
Timing Belt	Check/Replace
Cooling Water Leakage	Check/Replace
Fuel Filter (Can Be Disassembled)	Check/Replace
Fuel Line (High Pressure)	Check/Replace
Fuel Line (Low Pressure)	Check/Replace
Propeller/Propeller Nut/Cotter Pin	Check/Replace
Ignition Coils/Ignition Coil Leads	Check/Replace
Engine Start Switch/Engine Shut-Off Switch	Check/Replace
Wiring Harness Connections/Lead Coupler Connections	Check/Replace
Engine Oil Filter	Replace
Engine Oil	Replace
Gear Oil	Replace

ITEM	ACTION(S)
Valve Clearance	Check/Adjust
Anodes (Cylinder Head, Cylinder Block Thermostat Portion, Oil Cooler Cover, Exhaust Guide)	Replace
OCV Filter	Replace
Cowling Lock Lever	Check
Anodes (External)	Check
Anodes (Cylinder Head Exhaust Passage)	Check
Engine Starting Condition/Noise	Check
Engine Idle Speed/Noise	Check
Fuel/Oil Leakage	Check
PTT Unit	Check
Pilot Water	Check
Water Inlet	Check
Yamaha Meter/Gauge	Check
Grease Points	Lubricate
Shift Link/Shift Cable	Check/Adjust/Replace
Throttle Link/Throttle Cable	Check/Adjust/Replace
Battery (Electrolyte Level, Terminal)	Check/Adjust/Replace
Fuel Pump	Check/Replace
Impeller/Water Pump Housing	Check/Replace
Spark Plugs	Check/Replace
Thermostat	Check/Replace
Timing Belt	Check/Replace
Cooling Water Leakage	Check/Replace
Fuel Filter (Can Be Disassembled)	Check/Replace
Fuel Line (High Pressure)	Check/Replace
Fuel Line (Low Pressure)	Check/Replace
Propeller/Propeller Nut/Cotter Pin	Check/Replace
Ignition Coils/Ignition Coil Leads	Check/Replace
Engine Start Switch/Engine Shut-Off Switch	Check/Replace
Wiring Harness Connections/Lead Coupler Connections	Check/Replace
Engine Oil Filter	Replace
Engine Oil	Replace
Gear Oil	Replace

Your One-Stop Shop for Mercury Maintenance

Need maintenance Help?

We have the guides, videos, and articles to help you get the job done.

Need maintenance Help?

We have the guides, videos, and articles to help you get the job done.

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Mercury Maintenance Schedule

Select Your Maintenance Interval

Select Your Maintenance Interval

100 Hours/1 Year

300 Hours/3 Years

100 Hours/1 Year

300 Hours/3 Years

20 Hours/3 Months

100 Hours/1 Year

300 Hours/3 Years

500 Hours/5 Years

Your One-Stop Shop for Mercury Maintenance

Your One-Stop Shop for Mercury Maintenance

100 & 300 Hour Service Kits

Oil Change Kits

Gear Lube Kits

Shop All Mercury Parts

Need maintenance Help?

Need maintenance Help?

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