UAZ 2001 ???-3741, Инструкция по эксплуатации

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the red mark on the rotor is aligned with the index pointer on
the stator. Using the bolt, secure the octane selector plate to the
distributor body.
7. Reinstall the cap of the magnetic pickup and distributor
unit and check to see that the ignition wires running to the spark
plugs are set correctly in compliance with the engine firing order
(1-2-4-3), counting counterclockwise.
Each time after setting the timing, check for correct spark
timing by listening to the running engine, with the automobile
in motion. To this end, warm the engine up to a temperature of
80 °C and while moving in the direct gear on a level road at a
speed of 40 km/h, accelerate the automobile by sharply
depressing the accelerator pedal. If a light and short-time
detonation is heard before a speed of 55-60 km/h is reached, it
means that the ignition timing is set correctly.
In case of a heavy detonation, turn the magnetic pickup and
distributor unit body counterclockwise through 0.5-1.0 division
on the octane selector scale. Each division of the scale
corresponds to a change of the ignition timing by 4°C in the
degrees of the crankshaft angle. If the detonation was not heard
at all, increase the ignition advance angle by turning the body
of the magnetic pickup and distributor unit clockwise.
Note . To prevent the surface sparkover and burning through of the
magnetic pickup and distributor unit cap, see that the shoes of the high-
tension wires are completely seated in the cap terminal sockets. Never
switch on the ignition if moisture is detected on the cap. Keep the
plastic parts (cap, runner, low-tension terminal, sockets, etc.) clean.
Fig. 38. Adjusting octane selector setting