
We remove the spark plug tips along with the high-voltage wires, the ignition coils (you can only disconnect the connectors, leaving them on the valve cover), the throttle drive cable and, having disconnected the wires from the lubrication and cooling system sensors, remove the wiring harness from the head cover brackets

The piston of the 1st cylinder is set to the top dead center (TDC) position of the compression stroke so that when carrying out work related to removing the timing chains, the valve timing is not disturbed.

You will need: a 6-point hex key, 12-point, 13-point, 14-point sockets, a small chisel, a hammer
Drain the cooling system.

Compression (pressure at the end of the compression stroke) in the cylinders is the most important indicator for diagnosing the condition of the engine without disassembling it