Tool-free timing proofreading method for Shanghai Volkswagen LaVida

General method: the timing alignment method of 4-cylinder engine is to find the mark first when disassembling the engine. Generally all engines have it. If some engines can't be found, you can mark them yourself and disassemble them. Then remove the synchronous belt or chain to see if several tensioning wheels are in good condition, abnormal sound, need to be replaced and whether the water pump wheels are normal; Then, replace the new timing belt, turn the piston of the first cylinder to the direction of moving to the top dead center, then aim at the timing point of the crankshaft first, then aim at the timing point of the camshaft, then hook the belt or chain, fix the tensioner and adjust the belt tension. Every bolt should be fixed well, not too loose or too tight. Then, turn the crankshaft wheel several times with the sleeve to see if the upper and lower timing points can be in the marked position. If everything is all right, you can start the engine. Common engine faults after replacing the timing belt: 1. The belt falls off, mainly because the belt is too loose and the tension is not enough, and the serious consequence is that the valve is broken; 2. There is abnormal noise, because the belt is too tight and there is no room for activity, which leads to abnormal noise. 3. The engine cannot be backfired. This problem is very serious and the timing is not right. Reinstall the timing. Shanghai Volkswagen LaVida has no tool for timing alignment: 1. Let's look at the first picture. First, turn the crankshaft wheel and observe the piston of the cylinder. When the piston moves to the top dead center position, it will not move. 2. As the overhead double camshafts are adopted, jump the two camshaft points to the notch level. 3. After alignment, it will be OK! Hang up your belt, simple! Have you learned the timing alignment without tools after reading it?