Fig. 26 - Injector
3.2.17 Alternator maintenance
There is no need in the alternator special maintenance during the engine operation. Sea-
sonal alternator voltage “winter-summer” adjustment is done with a “winter-summer”
adjustment screw (if available) located on the alternator rear wall.
Diesel engines may be equipped with alternators with automatic “winter-summer” voltage
adjustment. With that, the “winter-summer” adjustment screw is not there.
Make sure the alternator mounting and that of the alternator wiring are reliable and keep
the alternator outer surface and terminals clean.
The alternator operability is checked with a voltage meter or with a control lamp and an
ammeter located on a vehicle dashboard. With the alternator operable, a control lamp
lights up at the mass switch-on before the engine start. After the engine start and at the
engine running at the middle speed the control lamp fades away, the voltage metter arrow
must stay in the green zone and the ammeter must show some charge current the value of
which goes down as the battery charge is restored.
3.2.18 Checking the belts tension
Checking the belts tension is done after every 125 engine operation hours.
The alternator belt tension is considered normal, if its deflection on the branch “crank-
shaft pulley-alternator pulley” stays within 13 mm to 18 mm when pressed with a force of
40±2 N. To adjust the belt tension, loosen the alternator mounting. Adjust the belt tension
turning the alternator housing. Tighten the alternator plate mounting bolt and the alterna-
tor mounting bolt nuts.