Mercury Marine Outboard Engine
Periodic Maintenance Service Schedule
Required Service Item

1 year or
100 hours' use

3 years or
300 hours' use

Before
Storage

Thermostat inspection1

Engine timing verification/Drive belt inspection

Drive shaft splines lubrication

Valve clearance inspection/ adjustment

Control cable adjustment

Water pump impeller replacement1,2

Fuel system service/inspection1

Gear lube replacement
Engine oil and filter replacement (Mercury FourStroke models)

NOTES:
1
These items may require more frequent intervals if exposed to contaminates that increase wear of impeller or clog passages or filters.
2 OptiMax® 135/150/175HP models require annual water pump impeller replacement.
Verado® models and current 75HP – 115HP FourStroke models do not require periodic valve adjustment

The information provided above is courtesy Mercury Marine and is provided as a courtesy to Power Source Marine's customers. Power Source Marine provides no warranty on the accuracy of the information. If you have a question about the information presented here, please contact us.