A visual inspection of the engine involves checking everything most often using a flashlight or borescope. Checking for leaks (oil, coolant), damaged belts/hoses, corrosion, loose parts, and clean/dirty fluids. Also the dipstick, looking for cracks, wear, and proper fluid levels to spot potential issues. Including things like oil burning (oily plugs) or head gasket leaks (sludge, clean spots on pistons) before expensive teardowns. Borescopes help inspect internal components like cylinder walls and valves without disassembly, revealing wear patterns or damage.
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