The hum generated during acceleration is not necessarily caused by the engine, but may also be caused by the wear of gearbox bearings, the decrease of lubricating fluid and the friction.
2. Engine problems
If it is indeed the hum of the engine, see if the speed is very high. If the vehicle speed increases during acceleration and the vehicle speed increases slowly, the clutch will slip and the clutch kit needs to be replaced.
3. Other issues
If noise occurs during steering, check whether the ball head and booster pump are faulty. If there is noise when braking, it may be that the brakes have slipped, resulting in rust or debris residue on the brake pads. If there is noise when turning on the air conditioner, consider checking whether the air conditioner compressor pulley slips.
Extended data:
Automobile engine:
Engine is the power device of automobile, which consists of crank-connecting rod mechanism, valve train, cooling system, oil supply system, lubrication system, ignition system and starting system and five systems, but diesel engine has one less ignition system than gasoline engine.
1. cooling system: generally composed of water tank, water pump, radiator, fan, thermostat, water thermometer and drain switch. There are two cooling methods for automobile engines, namely air cooling and water cooling. Generally, automobile engines are mostly water-cooled.
2. Lubrication system: The engine lubrication system consists of oil pump, filter screen, oil filter, oil circuit, pressure limiting valve, oil gauge, pressure sensitive plug and dipstick.
3. Fuel supply system:
The fuel system of gasoline engine includes fuel tank, gasoline meter, gasoline pipe, gasoline filter, gasoline pump, carburetor, air filter and so on.
The fuel system of diesel engine includes main components such as fuel injection pump, fuel injector and governor, and auxiliary devices such as diesel tank, fuel transfer pump, oil-water separator, diesel filter, fuel injection advance device, high and low pressure oil pipes, etc.
4. Starting system: starter, battery, etc.
5. Ignition system: spark plug, high voltage wire, high voltage coil, distributor, ignition switch, etc.
6. Crank-connecting rod mechanism: connecting rod, crankshaft, bearing bush, flywheel, piston, piston ring, piston pin, crankshaft oil seal, etc.
7. Valve mechanism: cylinder head, valve cover camshaft, valve intake manifold, exhaust manifold, air filter, muffler, three-way catalytic supercharger, etc.
Baidu encyclopedia-automobile