The correct, well-regulated engine works quietly, without any extraneous noises and sounds in any range of turns, smoothly selecting and dropping. The owners of the car would like to remember the net sound of a working new or repaired motor so as to immediately catch the false notes that appeared in his work.
As the details of the hinged equipment or belts are developed, there may be extraneous noise, say at a certain turn of the rudder, changes in the load on the generator, the activation of the air conditioner, etc.
Foreign noise in the GRM drive
Most modern engines have a gear belt in the GRM drive. For the constant tension in the drive structure, a traction video has been introduced, which is normally replaced with a GRM belt. Many ignore the replacement of the movie on the ground that the bearings don't play, don't jam, and don't make any noise. However, the manufacturer is not in vain to replace the tension-roller with the belt by laying out his/her asset for the duration of his or her life.
