MAINTENANCE
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999
Page 1B-3
Maintenance Schedules
Maintenance Intervals
Maintenance intervals and the tasks to be performed, as shown in this current schedule, or
as found in a previously printed schedules, are generally based on an average boating
application and environment. However, individual operating habits and personal mainte-
nance preferences can have an impact on the suggested intervals. In consideration of these
factors, MerCruiser has adjusted some maintenance intervals and corresponding tasks to
be performed. In some cases, this may allow for more individual tasks to be performed in
a single visit to the serving dealer, rather than multiple visits. Therefore, it is very important
that the boat owner and servicing dealer discuss the current Maintenance Schedule and
develop appropriate maintenance intervals to coincide with the individual operating habits,
environment, and maintenance requirements.
Always disconnect battery cables from battery BEFORE working around electrical systems
components to prevent injury to yourself and damage to electrical system should a wire be
accidentally shorted.
Scheduled Maintenance That Can Be Performed By Owner/Operator
NON-HORIZON MODELS
NOTE: Only perform maintenance which applies to your particular power package.
Task
Interval
Engine Crankcase Oil - Check Level
Closed Cooling Coolant - Check Level
Power Steering Fluid - Check Level
Sterndrive Unit Oil - Check Level
Battery - Check Level And Inspect For
Damage
Weekly
Power Trim Pump Oil - Check level
Anodes - Inspect For Erosion
Gear Housing Water Pickups - Check
For Marine Growth Or Debris
Serpentine Drive Belt - Inspect Condition
And Check Tension
Every 100 Hours Of Operation Or 120
Days, Whichever Occurs First.
Propeller Shaft - Lubricate
Saltwater Use: Every 50 Hours Of
Operation Or 60 Days, Whichever Occurs
First.
Power Package - Exterior Surfaces -
Spray With Rust Preventative
First.
Freshwater Use: Every 100 Hours Of
Operation Or 120 Days, Whichever
Occurs First.
Power Package Exterior Surfaces - Clean
And Paint
Once A Year
Cooling System - Flush Seawater Section
Saltwater Use: After Every Use.
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