Mercury/Mariner 3.0 MPI ECT User Manual

Section 5 - Maintenance
Page 60 90-8M0074347 eng OCTOBER 2012
Task Interval Maintenance to Be Performed
Every two months or 50
hours of operation
• Remove the propeller and lubricate the propeller shaft and torque 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.
• 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.)
Scheduled Maintenance
NOTE: Only perform maintenance which applies to your particular power package.
Task Interval
Maintenance to Be Performed
After the initial 20‑hour
break‑in period
Change the engine oil and filter.
Every 50 hours of
operation or 2 months
(whichever occurs first)
All Bravo models except 496 : Lubricate the engine coupler (lubricate the engine coupler every 50
hours if operated at idle for prolonged periods of time).
Every 100 hours of
operation or annually
(whichever occurs first)
• Touch‑up the paint on the power package.
• Change the engine oil and filter.
• Change the sterndrive gear lube.
• On models with closed cooling, check the coolant level and antifreeze concentration for
adequate freeze protection. Correct if necessary. Refer to the Specifications section.
• Tighten the connection of the gimbal ring to the steering shaft to specifications.
• Replace the water‑separating fuel filter.
• Inspect the fuel pump sight tube on the engine.
• 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 if equipped.
• Clean the flame arrestor, IAC muffler, and the crankcase ventilation hoses. Inspect the PCV
valve, if equipped.
• Inspect the condition and the tension of the belts.
• Driveshaft extension models: lubricate the driveshaft U‑joints, and tailstock input and output
bearings.
Every 150 hours of
operation or annually
(whichever occurs first)
All Bravo models except 496: Lubricate the engine coupler.

Mercury/Mariner 3.0 MPI ECT Specifications

General

Brand	Mercury/Mariner
Model	3.0 MPI ECT
Category	Engine
Language	English