Maintenance Schedule-Sterndrive Models; Routine Maintenance; Scheduled Maintenance; Section 4 - Specifications - MerCruiser 350 MAG Owner's Manual

Section 5 - Maintenance
Maintenance Schedule—Sterndrive Models

Routine Maintenance

NOTE: Only perform maintenance that applies to your particular power package.
Every two months or 50

Scheduled Maintenance

NOTE: Only perform maintenance that applies to your particular power package.
After the initial 20‑hour
Every 100 hours or
(whichever occurs first)
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Task Interval
• Check the engine oil level. (You can extend this interval based on experience
with the product.)
• Check the sterndrive gear lube level.
Each day start
• Check the trim pump oil level.
• Check the power‑assisted steering pump or the compact hydraulic steering
fluid level, depending on the steering system of your model.
• If operating in saltwater, brackish water, or polluted water, flush the seawater
Each day end
section of the cooling system after each use.
• Check the water inlets for debris or marine growth.
• Check and clean the seawater strainer, if equipped.
Weekly
• Check the coolant level.
• Inspect the sterndrive anodes and replace if 50% eroded.
• Lubricate the propeller shaft and retorque the nut. (If operating only in
freshwater, you can extend the interval to every four months.)
• If operating in saltwater, brackish water, or polluted water, apply Corrosion
Guard to the power package.
hours
• Check the battery connections and the fluid level.
• Ensure that the gauges and the wiring connections are secure. Clean the
gauges. (If operating in saltwater, reduce this interval to every 25 hours or
30 days, whichever occurs first.)
Task Interval
Change the engine oil and filter.
break‑in period
• Touch up the paint on the power package.
• Change the engine oil and filter.
• Change the sterndrive gear lube.
• Tighten the connection of the gimbal ring to the steering shaft to
specifications.
• 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. If the package
annually
is equipped with a MerCathode, test the MerCathode unit output.
• Clean the flame arrestor, IAC muffler (MPI engines), and the crankcase
ventilation hoses. Inspect the PCV valve, if equipped.
NOTE: On MerCruiser V6 models, the PCV valve is a non‑serviceable, internal
component of the valve cover assembly.
• Inspect the condition and the tension of the belts.
• Check the coolant level and antifreeze concentration for adequate freeze
protection. Correct if necessary. Refer to the Specifications section.
• On driveshaft extension models, lubricate the driveshaft U‑joints and
tailstock input and output bearings.
Maintenance to Be Performed
Maintenance to Be Performed
90-864195072 OCTOBER 2007