Ключевые слова: adult, aluminum, assembly, automobile, background, bike, black, block shape, bolt, business, camshaft, car, closeup, control, cylinder, disassembling, dohc, engine, engineering, garage, gear, hand, head, human body part, industry, machine, machinery, maintenance, mechanic, motor, occupation, part, piston, power, problems, repair, repairer, repairing, repairman, service, serviceman, steel, technician, technology, valve, vehicle, water cooling, working, workshop,