How to do it right: Have timing marks and mark them with yourself. Why do this: You know the camshaft, the camshaft rotates and pushes the valve. The car needs to be balanced, and the generator cannot shake, so when it is moving, one cylinder is up and one cylinder is symmetrical. Based on this idea, this is one. The second is that the piston movement of the generator is separate from our valve movement, but When our engine piston goes up, it must be ready to inhale or exhaust air. How to make them into a whole requires timing. The result is to inhale at the right time, open the intake valve, and open the exhaust valve at the right time to exhaust. Novices only need to remember the timing marks. It doesn’t need to be too complicated
There are two fundamental reasons for the loud engine noise: excessive carbon deposits in the engine. The engine oil is inappropriate or the oil is dirty.
In addition, most of the engine noise is caused by abnormal engine noise:
1. Engine lower protection Board screws are loose. A relatively common minor fault is tightening or adjusting the engine lower guard plate screws.
2. The engine claw pads are aging. The claw pads play a role in supporting the engine and can only be replaced after aging.
3. The plastic parts in the engine compartment are loose. For example, the engine cover, air intake pipe, etc. can be tightened.
4. The engine belt makes abnormal noise. Including power belts, generator belts, etc. If the belt is old or is too loose or too tight, it will produce abnormal noise. Replace or adjust the tightness.
5. Engine knocking. There is too much carbon deposit inside the engine or the fuel usage is substandard. Clean carbon deposits and replace fuel.
6. Abnormal valve noise. Especially after the car is cold, the valve will make a "click-click" sound, and then it will be fine when the car is warmed up. This is because the engine oil is deposited in the oil pan and is not "pressed" in time when the engine is started. But if the valve keeps ringing, you should consider changing to a thicker engine oil (for how to choose engine oil, please refer to "How to Choose the Engine Oil Correctly").
7. Engine "backfire" failure. The engine will make a "puff-puff" sound, which may be caused by excessive carbon deposits on the valves or improper timing adjustment. Clean the carbon deposits on the valves and adjust the valve timing.
8. The engine is missing a cylinder. If a certain cylinder does not ignite, most likely the spark plug or ignition module is faulty and can be replaced.
9. Abnormal noise from the bearing. There will be regular "buzzing" sounds in bearings, such as engine tensioners, idlers, generators, etc. This can be solved by replacing relevant parts.