Mercury 3S4Z-6758-AA Tube Assembly

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First of all, there is a need to regularly check rubber and plastic hoses in the engine, accessory, and emission systems for cracks, loose clamps, hardening, and leaks. The PCV system hose should be checked for damage or blockages. Vacuum hoses may be color-coded or striped. Use a vacuum hose as a stethoscope to detect leaks. Replace any damaged fuel lines with ones made specifically for use in fuel injection systems. Metal fuel lines must also be inspected for bends, crimps, and cracks. Metal brake lines should be scrutinized closely for cracks, loose fittings, and brake fluid leakage.

Inspect metal brake lines for cracks and loose fittings, especially at the master cylinder and brake proportioning unit.

When inspecting metal lines, check for bending, crimping, or cracking. For replacement, use seamless steel tubing. Specifically, for brake lines, inspect for cracks and loose fittings where they enter the master cylinder and brake proportioning unit. Any brake fluid leakage should be addressed promptly with a comprehensive brake system inspection.

Disconnect the fresh air inlet hose from the front valve cover, the rear valve cover, and the air intake duct.

The crankcase vent oil separator is located on the front side of the engine block, behind the exhaust manifold and the catalytic converter.

When inspecting hoses, be on the lookout for cracks, loose clamps, material hardening, and leaks. Ensure that hoses secured with clamps maintain their tension to prevent leaks. For hoses without clamps, check for expansion or hardening at the fitting points, which can also lead to leaks.