Sometimes camshaft lobes touch the rocker arm directly (as you see with overhead camshaft engines), thus opening and closing the valve. On overhead valve engines, the camshaft lobes don’t come into direct contact with the rocker arms, so pushrods or lifters are used.
Once the wire problem is located, typically the damaged wire or two can be repaired, or a new piece of wire can be spliced in. But sometimes the damage is more extensive, wires are melted, or a hard-to-reach location makes repair impossible.
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