Components commonly connected to the wiring harness include the on-board diagnostic computer and fuel-injection system of many vehicles, auxiliary lights and dashboard controls. The emissions system and similar electrical components also connect directly to the harness, as do turn signals and other required systems. On many automobile wiring harnesses, the connectors and wires that connect these systems swap out easily for quick repairs and replacement.
The crankshaft is what converts the up and down motion of the pistons into a rotational motion that allows the car to move. The crankshaft typically fits lengthwise in the engine block near the bottom. It extends from one end of the engine block to the other. At the front of the end of the engine, the crankshaft connects to rubber belts which connect to the camshaft and delivers power to other parts of the car; at the back end of the engine, the camshaft connects to the drive train, which transfers power to the wheels. At each end of the crankshaft, you’ll find oil seals, or “O-rings,” which prevent oil from leaking out of the engine.
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