Belarus 1523, Operating Manual

Page: 67 / 312

BELARUS-1523/1523 В /1523.3 /1523В.3 Construction and Operation
66
1 – transfer valve; 2 – paper oil filter; 3 – heat-exchanger; 4 – main oil pipeline; 5 – oil pressure warning
sensor; 6 – oil pressure gauge; 7 – turbocharger; 8 – fuel pump; 9 – pneumatic compressor; 10 – inter-
mediate gear; 11 – rocker-arm axle oil passage; 12 – distribution camshaft; 13 – crankshaft; 14 – cen-
trifugal oil filter; 15 – piston; 16 – piston cooling jet; 17 – crankcase; 18 – drain plug; 19 – oil pick-up; 20 –
oil pump; 21 – relief valve
The oil pump takes oil from the crank-
case through the oil pick-up and delivers
it to a full-flow oil filter equipped with a
paper filter element through passage-
ways in the cylinder block. Some quality
of oil enters the centrifugal oil filter to be
cleaned and drained back into the crank-
case.
The filter element houses a bypass valve
(1). The valve opens in case of exces-
sive clogging
of the filter element as well as when a
cold engine start-up is attempted, and re-
turns oil into the main pipeline, bypassing
the filter element. This valve is not ad-
justable. Besides, the filter contains a re-
lief valve (21) adjusted to maintain the
pressure in the lubrication system within
the range 0.28…0.45 MPa (2.8…4.5
kgf/cm
2
).
When the engine is running, the oil fil-
tered and cooled in the oil-to-fluid heat-
exchanger (3) is delivered to all bearings
of the crankshaft and camshaft through
passageways in the cylinder block.
Through the injectors (16) built into the
engine block main journals, the oil is fed
for cooling the pistons (15). Downstream
the heat exchanger (3), oil is passed
through separate pipelines for lubricate
the turbocharger (7) and the tractor
pneumatic system compressor (9).