Octane corrector
1 - nut; 2 - body; 3 - octane corrector
When operating a car, sometimes, depending on the quality of the fuel being refueled, it becomes necessary to correct the ignition timing. The ignition timing is corrected by an octane corrector, which allows you to reduce or increase the ignition timing. Signs "+" (advance) And "-" (lag), printed on the scale of the octane corrector, indicate the direction of its rotation.
Adjust the ignition timing on a warm engine. Before adjusting, mark the position of the middle notch of the octane corrector on the cylinder block. When driving on a level road in direct gear at a speed of 50 km/h, depress the accelerator pedal sharply. If this causes a slight and short-term detonation, then the ignition timing is set correctly.
With strong detonation (early ignition) loosen nut 1 and turn body 2 0.5–1 division clockwise (on "-"). If there is no detonation (late ignition) turn housing 2 0.5-1 division counterclockwise (on "+").
After adjustment, tighten nut 1 and check again for correct ignition timing while driving.