Harnesses are wrapped in a protective covering and then routed and secured throughout the vehicle to protect them from damage. But life for vehicles can get tough. Constant vibration, flexing, exposure to heat and cold, water, ice, and salt can all eventually take a toll on the wiring. Wiring harness damage is also not unusual when a vehicle has been involved in a collision.
Rocker arms are little levers that touch the lobes, or cams, on the camshaft. When a lobe lifts one end of the rocker, the other end of the rocker presses down on the valve stem, opening the valve to let air in to the combustion chamber or letting exhaust out. It works sort of like a see-saw.
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