Mercury 4L8Z-6758-BA Tube Assembly

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Due to the high temperatures under the hood that can lead to deterioration, it is important to regularly check hoses in the engine, accessory and emission systems of your car. Look out for cracks, loose clamps, material hardening and leaks in hoses. Ensure that the hoses are secured using clamps and maintain tension so as to avoid any leaks. Inspect hoses without clamps at fitting points where they may expand or harden causing leaks. Check the PCV system hose for any damage such as cracks or leaks. If clogged check for obstruction and clean with solvent. Vacuum hoses should be replaced with those made from similar materials. Label them properly for reinstallation purposes if you take them off again. Plastic T-fittings should be checked for cracks and hose distortion using small pieces of vacuum hoses as stethoscope if necessary. Use a small piece of vacuum hose as a stethoscope to detect leaks. Examine flexible fuel lines that may be deteriorated, chafed or cracked before using a hose intended for your fuel injection system.

Remove the catalytic converter and exhaust manifold, disconnect the PCV hose, remove the mounting bolts, and detach the separator from the engine block.

Vacuum hoses are often color-coded and require specific characteristics. When checking vacuum hoses, use hoses made of the same material when replacing them. If necessary, remove the vacuum hoses from the vehicle for a thorough inspection, and label them for proper reinstallation. Inspect plastic T-fittings for cracks and check the hose where it fits over each fitting for distortion. You can use a small piece of 1/4-inch inside diameter vacuum hose as a stethoscope to detect vacuum leaks by listening for hissing sounds.

Discard the old PCV valve and replace it with a new one.