There is no mark on the timing chain of Chery QQ No.3 steel machine. What's the best adjustment?

The timing chain is unmarked, so special tools are needed to locate the rear of the camshaft. There is a special tool positioning hole under the motor. Just use the 17mm wrench to remove the screw and install the positioning screw. At this time, the four-cylinder pistons are parallel, and the position of the camshaft is eight.

Timing, that is, the movement of the piston is well coordinated with the opening and closing of the valve. Each model has a timing mark or a specific timing tool. As for how to judge whether the timing is normal, it is easy to have a timing gun. If not, try the engine. The engine works normally, with rapid acceleration, rapid deceleration, idle speed, medium-high and low speed, no backfire, no ignition, strong power and rapid throttle response, which can be judged as normal.