This manual explains how to maintain and service Mercury Marine outboard motors.
This manual provides maintenance procedures for Mercury 25-30HP FourStroke outboard motors to ensure safety and dependability. It outlines a schedule of inspections and maintenance tasks categorized by frequency, such as before each use, after each use, and every 100 hours or once yearly.
| Gearcase lubricant capacity | approximately 280 ml (9.5 fl. oz.) |
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Engine oil should be changed every 100 hours of use or once yearly, whichever occurs first.
Spark plugs should be replaced at the first 100 hours or first year, and then inspected every 100 hours or once yearly.
The water pump impeller should be replaced every 300 hours of use or three years.