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Mercury 90 Operation Maintenance Installation Warranty Manual

Mercury 90
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Description Nm lb‑in. lb‑ft
Outboard mounting locknuts and
bolts ‑ standard boat transom
75 55
Outboard mounting locknuts and
bolts ‑ metal lift plates and setback
brackets
122 90
Check corrosion control anodes. Check more frequently when used in
saltwater. Refer to Corrosion Control Anode.
Drain and replace gearcase lubricant. Refer to Gearcase Lubrication.
Inspect battery. Refer to Battery Inspection.
Saltwater usage: Remove and inspect spark plugs for corrosion and
replace spark plugs, as necessary. Apply a thin layer of Anti‑Seize
Compound only on threads of spark plug prior to installation. Refer to
Spark Plug Inspection and Replacement.
Tube Ref
No.
Description Where Used Part No.
81
Anti-Seize
Compound
Spark plug threads 92-898101385
Check wiring and connectors.
Check tightness of bolts, nuts, and other fasteners.
Check cowl seals to ensure the seals are intact and not damaged.
Check internal cowl sound reduction foam (if equipped) to ensure the
foam is intact and not damaged.
Check that the intake silencer (if equipped) is in place.
Check that the idle relief muffler (if equipped) is in place.
Check for loose hose clamps and rubber boots (if equipped) on the air
intake assembly.
EVERY 300 HOURS OF USE OR THREE YEARS
Replace water pump impeller (more often if overheating occurs or
reduced water pressure is noted). This item should be serviced by an
authorized dealer.
Check power trim fluid. Refer to Checking Power Trim Fluid.
Replace spark plugs after the first 300 hours or three years. After that,
inspect spark plugs every 300 hours or three years. Replace spark plugs
as needed. Refer to Spark Plug Inspection and Replacement.
BEFORE PERIODS OF STORAGE
Refer to Storage section.
MAINTENANCE
eng 65

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Mercury 90 Specifications

General IconGeneral
BrandMercury
Model90
CategoryOutboard Motor
LanguageEnglish

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