242
For maintaining the first cleaning stage disconnect the air pipes, remove the
cover, unscrew the fixings, take out the cardboard element, take off the air filter,
remove dust from the bin cover. Wash the housing and cover either in diesel fuel
or hot water, blow through with dry compressed air and dry.
Inspect visually the filter element. A thin coating of dust on its inner side
indicates that the element or its sealing gaskets are not tight. In this case replace
the filter element.
Check sealing quality by an uninterrupted imprint on the gasket.
To maintain the filter element take off the precleaner and dislodge dust from
it by shaking it or blowing through. If no ash or soot is seen on the element
cardboard (element colour is grey), blow it through with dry compressed air until
dust is blown off completely. To avoid tearing of the cardboard, the air pressure
should not exceed 200-300 kPa (2-3 kgf/cm
2
). When blowing direct the air jet at
an angle, adjust its force by changing the hose-to-element distance.
If soot or oil are seen on the cardboard, or if blow
-
over with compressed air
proves ineffective, either replace the element or wash it in warm water (40-50 °C)
with a detergent (for example, conventional powered detergent) dissolved in it, in
proportion 20-25 g/1 l. Wash the element by immersing it in the solution for
half an hour, then rotate it or dip vigorously during 10-15 min. After washing in
the solution, rinse the element in clean warm water and dry. Do not dry it above
open fire or in air heated over 70 °C.
After each servicing or fitting a new element a visual inspection of its con-
dition should be made, illuminating it with a bulb.
Replace the element if mechanical injuries, cardboard broken corrugations
or ply separations are evident
.
The estimated service life of the cardboard filter element is 30 000 km. More
frequent cleaning of the filtering element might reduce its service life, since total
attempts of element servicing are limited (to 5-7 attempts including washing 3
times, maximum) because of possible cardboard disrupture.
Inspect the condition of corrugated and smooth connecting rubber hoses at
regular intervals. Replace them if any defects, such as cracks, cuts, ruptures and
others are detected.
Engine Starting Preheating System
Fig. 25, page 42, Operation Manual: items 1, 2, 6 are excluded.
There are added:
-
delivery pipe from pump unit to heat exchanger;
-
delivery pipe from engine unit to pump unit.
Cooling System
Control over coolant temperature in the cooling system is performed by the
indicator installed in the dashboard. The indicator sender is fitted in the water-
collecting pipe. The coolant temperature in the cooling system should be within
75–100
°
C.
When the temperature in the cooling system reaches 95
°
C the coolant over-
heating alarm lights up. This alarm warns that it is necessary to detect the reason of
engine overheating and eliminate it.
In special situations it is possible to continue travelling with the lighting alarm
provided that the coolant temperature indicator is carefully observed. A short-time
temperature rise, for 10 min maximum, up to 95
°
C is permissible.
