Maintenance Log - Mercury 350 MAG Manual

Section 5 - Maintenance
Task Interval
Every 300 hours of
operation or 3 years
Every 5 years

Maintenance Log

Record all maintenance performed on your power package here. Be sure to save all work orders and receipts.
Date Maintenance Performed
Page 78
• Check the engine mounts for tightness and torque if necessary.
• Check the electrical system for loose, damaged, or corroded fasteners.
• Inspect the condition of the spark plugs, spark plug wires, and the distributor cap and rotor, if
equipped. Replace as necessary.
• Check the cooling system and the exhaust system hose clamps for tightness. Inspect both
systems for damage or leaks.
• Disassemble and inspect the seawater pump and replace worn components.
• On models with closed cooling, clean the seawater section of the closed cooling system. Clean,
inspect, and test the pressure cap.
• Inspect the exhaust system components. If the package was equipped with water shutters
(flapper valves), verify that they are not missing or worn.
• Check the engine alignment.
• Inspect the U‑joints, the splines, the bellows, and check the clamps.
• Lubricate the U‑joint splines and cross bearing, if equipped with a grease fitting.
• Inspect the gimbal bearing for roughness. Replace if necessary. See your certified Mercury
MerCruiser dealer.
• Vazer models, Alpha models, and 496 MAG Bravo models only: Lubricate the engine coupler.
• Replace the coolant. Replace every two years if not using extended‑life coolant.
Maintenance to Be Performed
Engine Hours
90-8M0050539 MAY 2011
eng