Section 5 - Maintenance
Page 78 90-8M0050539 eng MAY 2011
Task Interval Maintenance to Be Performed
Every 300 hours of
operation or 3 years
• 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.
Every 5 years
• Replace the coolant. Replace every two years if not using extended‑life coolant.
Maintenance Log
Record all maintenance performed on your power package here. Be sure to save all work orders and receipts.
Date Maintenance Performed Engine Hours
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