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... insulation cracked, perished or damaged in any way must be replaced. Sparking Plugs: The sparking plugs fitted to the Austin-Healey Sprite are of the Champion N.5 Long Reach type, and as they are of great importance to satisfactory engine performance, every care should be taken to fit only the recommended type when replacements become necessary. Every 3,000 miles (5,000 km.), remove the plugs and clean off all carbon deposit from the electrodes and plug threads with a stiff brush dipped in paraffin. Alternatively the plugs may be taken to the local Austin dealer for cleaning and testing on a special ‘Air Blast’ service unit. Check the plug gaps with the gauge provided and reset if necessary to the recommended clearance of .025 in. (.64 mm.). When resetting, bend the side electrode only. Never bend the centre electrode as this may split the insulator tip. When refitting the plugs, make sure that the copper washers are not defective in any way. If they have become worn and flattened, fit new ones to ensure obtaining a gastight joint. Screw the plug down by hand as far as possible, then use a spanner for tightening only. Always use a tubular box spanner to avoid possible damage to the insulator, and do not under any circumstances use a movable wrench. Never overtighten a plug, but ensure that a good joint is made between the plug body, washer and cylinder ...
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