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Mercury 300R HD CMS Mechanical User Manual

Mercury 300R HD CMS Mechanical
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Change engine oil and replace the oil filter. The oil should be changed
more often when the engine is operated under adverse conditions, such
as extended trolling. Refer to Changing Engine Oil and Filter.
Check the engine mounted water‑separating low‑pressure fuel filter for
water or contaminants. Replace the filter if required. Refer to Fuel
System.
Check the boat mounted water‑separating fuel filter for the presence of
water or contaminants. Drain the water or replace the filter if required.
Remove the propeller and lubricate the propeller shaft. Refer to Propeller
Replacement.
Inspect the thermostat visually for corrosion or a broken spring. Ensure
that the thermostat closes completely at room temperature—dealer
service.
Check the outboard mounting fasteners that fasten the outboard to the
boat transom. Tighten the fasteners to the specified torque—dealer
service.
Description
Nm lb‑in. lb‑ft
Outboard mounting locknuts and
bolts ‑ standard boat transom
75 55.3
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 as necessary. Apply 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 92-898101389
Check tightness of bolts, nuts, and other fasteners—dealer service.
Add Quickleen Engine and Fuel System Cleaner to the fuel tank.
Tube Ref
No.
Description Where Used Part No.
Quickleen Engine &
Fuel System
Cleaner
Fuel tank 8M0047931
MAINTENANCE
50 eng

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Mercury 300R HD CMS Mechanical Specifications

General IconGeneral
BrandMercury
Model300R HD CMS Mechanical
CategoryOutboard Motor
LanguageEnglish

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