2.16. Check and adjustment of frequency of rotation of a bent shaft of the engine idling and qualities of fuel-air mix

Frequency of rotation of a bent shaft of the engine idling is criterion of operation of the engine in general and its systems.
For measurement of frequency of rotation of a bent shaft of the engine idling it is necessary to use a tachometer. The scheme of connection is various at different manufacturers therefore it is necessary to follow the instructions provided in the instruction for application of a concrete tachometer.
Before adjustment of frequency of rotation of a bent shaft of the engine idling at first correctly adjust gaps of valves, system of ignition (a corner of an advancing, spark plugs) has to work normally.
Warm up the engine up to the working temperature and be convinced that the air gate is completely open. Switch-off the contact socket of the fan of a radiator, switch off everything minor consumers of the electric power and the air conditioner (if it is established). On models with the automatic transmission install the selector lever in situation "N" and turn on the parking brake.

Fig. 2.12. Arrangement of screws of adjustment of quality (1) of fuel-air mix and frequency of rotation (2) of a bent shaft of the engine


Launch the engine and compare indications of a tachometer idling with specified in specifications. Adjustment is carried out by rotation of the screw of adjustment of frequency of rotation of a bent shaft of the engine idling (fig. 2.12).
The analyzer of the fulfilled gases (the SO level measuring instrument) is necessary for adjustment of quality of fuel-air mix in the mode of idling.
Connect it and launch the engine in the idling mode. Compare indications of contents WITH in the fulfilled gases to the value given in specifications. Adjustment is carried out by rotation of the screw of adjustment of quality of fuel-air mix (see fig. 2.12).
If the screw of adjustment of quality of fuel-air mix is closed by a protective cover, for access to the screw uncover.
If the composition of fuel-air mix in the mode of idling is adjusted correctly, repeatedly check the frequency of rotation of a bent shaft of the engine idling and in case of need adjust it.
Stop the engine, disconnect a gas analyzer and connect the socket to the radiator fan.