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Mercury 4.2 Diesel User Manual

Mercury 4.2 Diesel
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Section 4 - Maintenance
90-8M0113987 eng DECEMBER 2015 Page 75
1. Paint the power package.
2. Annually spray the power package components on the inside of the boat with Corrosion Guard to protect the finish from
dulling and corrosion. You may also spray external power package components.
3. Keep all lubrication points, especially the steering system, shift, and throttle linkages, well lubricated.
4. Flush the cooling system periodically, preferably after each use.
Continuity Circuit—Bravo Sterndrive
The transom assembly and sterndrive have ground‑circuit wires to ensure good electrical continuity between the engine,
transom assembly, and sterndrive components. Good continuity to a ground is essential for the anode and MerCathode system
to function effectively.
1. Inspect the steering lever ground wire for loose connections, broken connectors, or frayed wiring.
2. Inspect the inner transom plate ground wire for loose connections, broken connectors, or frayed wiring.
Steering lever continuity wire
Transom plate continuity wires
a - Continuity wire
3. Inspect the flywheel housing grounding stud and ground wire, and the inner transom plate grounding screw for loose
connections, broken connectors, or frayed wiring.
Typical
a - Flywheel housing screw or grounding stud
b - Continuity circuit (ground) wire
c - Inner transom plate grounding screw
a
27282
a
27283
7782
a
b
c

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Mercury 4.2 Diesel Specifications

General IconGeneral
BrandMercury
Model4.2 Diesel
CategoryEngine
LanguageEnglish

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