Mercury 4L8Z-6A664-CA Vent Hose

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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.

Thoroughly clean the fresh air inlet hose and inspect it for cracks, tears, or deterioration. Replace it if damaged, and also check the grommet at the air intake duct.

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 quick-connect coupling from the PCV valve and turn the valve counterclockwise to remove it.