Does a major overhaul of the Volkswagen CC engine have any impact?

[VanIvan]

As long as most of the replaced parts are normal components and the assembly is done properly, there will be no impact on the engine. Generally, a major overhaul refers to the adjustment and replacement of core components such as pistons, piston rings, cylinder liners, crankshafts, bearings, rocker arms, valves, push rods, etc. It also involves adjusting valve clearance and fuel injection timing, as well as performing computer matching for the engine control module (VECU). A professional major overhaul can essentially restore the engine to its optimal normal condition, so there is no need to worry. After a major engine overhaul, it is important to note that cold running-in should last for more than 3 hours, which means the engine is slowly rotated by an electric motor. Then, hot running-in should last for more than 2 hours, which is idle rotation. Of course, most auto repair shops do not have such capabilities, so you can only idle the engine for two to three hours initially. Within the first week of driving, do not exceed 60 km/h, and avoid sudden acceleration or deceleration.