Abstract: A shielding and retaining system for vehicle engine electrical components, and particularly, components forming part of the ignition system thereof such as the spark plugs, ignition coil and distributor. The spark plug, when located in the engine block, is shielded by means of a spark plug shield. In addition, the distributor is provided with a body enclosure which is disposed around the distributor and is secured thereto thereby providing electrical shielding around the distributor. In like manner, a separate body enclosure is provided to be fitted around the coil and which also prevents radio frequency signals emanating from the coil. With a minimum amount of shielding components, it is possible to reduce a substantial portion of radio frequency noise.

Abstract: A shielding device for spark plugs which are oriented in an engine block by a key and keyway means such that the electrodes of the spark plug are located in a predetermined orientation in a combustion chamber in the engine. The spark plug is secured in place by a shielding enclosure to prevent radio frequency interference and also to provide an explosion-proof chamber around the spark plug. The shield of the spark plug is provided with an externally threaded section which is threadedly secured to a mating threaded section on the vehicle engine block. The shield is provided with an inner conical surface abutting against a shoulder on the body of the spark plug in order to axially force the plug into the engine block with shoulder to shoulder contact.