MerCruiser 350 MAG MPI Horizon User Manual

Section 5 - Maintenance
90-864195070 JUNE 2007 Page 67
Maintenance Schedule ‑ Sterndrive Models
Routine Maintenance
NOTE: Only perform maintenance which applies to your particular power package.
EACH DAY START
• Check the crankcase oil (interval can be extended based on experience).
• Check the drive unit oil level, the trim pump oil level, and the power steering pump or
compact hydraulic steering fluid level.
EACH DAY END
• If operating in salt, brackish or polluted waters, flush the cooling system after each use.
WEEKLY
• Check the water inlets for debris or marine growth. Check the seawater strainer and
clean. Check the coolant level.
• Inspect the drive unit anodes and replace if 50 percent eroded.
EVERY TWO MONTHS OR 50 HOURS
• Lubricate the propeller shaft and retorque the nut (if operating in only freshwater, this
maintenance may be extended to every four months).
• Operating in saltwater or brackish or polluted water only: treat the power package with
Corrosion Guard.
• Check the battery connections and the fluid level.
•
Ensure that the gauges and the wiring connections are secure. Clean the gauges.
1.
Scheduled Maintenance
NOTE: Only perform maintenance which applies to your particular power package.
AFTER THE INITIAL 20 HOUR BREAK-IN PERIOD
To help extend the life of your Mercury MerCruiser power package, we reccommend the
following:
• Change the engine oil and filter
• Change the sterndrive lube.
EVERY 100 HOURS OR ANNUALLY (WHICHEVER OCCURS FIRST)
• Touch‑up the paint on the power package.
• Change the crankcase oil and filter.
• Change the drive unit oil
• Retorque the connection of the gimbal ring to the steering shaft.
• Replace the water separating fuel filter element.
• Check the steering system and the remote control for loose, missing or damaged parts.
Lubricate the cables and the linkages.
• Check the continuity circuit for loose or damaged connections. Test the MerCathode
unit output on Bravo Models.
NOTE: On V6 models the PCV valve is non serviceable and is an internal component of
the valve cover assembly.
• Clean the flame arrestor, IAC muffler (MPI engines), and the crankcase ventilation
hoses. Inspect the PCV valve, if equipped.
• Inspect the condition and the tension of the belts.
1. If operating in saltwater, interval is reduced to every 25 hours or 30 days whichever occurs first.

MerCruiser 350 MAG MPI Horizon Specifications

General

Brand	MerCruiser
Model	350 MAG MPI Horizon
Category	Engine
Language	English