Belarus 1221.2, Руководство оператора

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BELARUS-1221.2/1221 В .2/1221.3 Description and operation
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of the engine, and flows to the diesel suc- tion manifold.
Fig. E-7. CAC outfit:
1, 4, 10 – air ducts; 2, 6 – clamp; 3, 5, 11 – junction branch-pipes; 7 – gasket; 8 – washer; 9 – bolt M8x16; 12
– nut; 13 – cooler (CAC); 14 – water radiator; 15 – turbocharger; 16 – engine induction manifold.
The engine lubrication system is com-
bined: some parts are force-lubricated, the
others are splashed lubricated. The sys-
tem comprises an oil pump, oil filter with a
paper filter element, centrifugal oil pump,
and an oil-to-liquid heat exchanger. The
lubrication system diagram is shown in
Fig. E-8.
The oil pump (20) is a gear-type, single-
stage unit driven from the crankshaft. It is
provided with an overflow valve which
opens at a pressure of 0.7…0.75 MPa
(7…7.5 kgf/cm
2
) and passes oil from the
discharge chamber into the suction cham-
ber.
The oil filter is of the single-flow type, with
a paper filter element. The filter is pro-
vided with an overflow valve (1). The valve
opens in case of excessive clogging of the
filter element as well as when attempting
to start a cold engine and returns oil into
the main pipeline while bypassing the filter
element. This valve is not adjustable. Be-
sides, the filter is provided with a relief
valve (21) adjusted to maintain a pressure
within 0.28…0.45 MPa (2.8…4.5 kgf/cm
2
)
limits in the lube system.
With the engine running, oil, filtered and
cooled in the oil-to-liquid heat exchanger
(3), is supplied to all the bearings of the
crankshaft and camshaft through the pas-
sageways in the cylinder block. The pis-
tons (15) are cooled through the nozzles
(16) built into the engine block main jour-
nals. For lubricating the turbocharger (7)
and compressor (9) of the tractor pneu-
matic system, oil is delivered via separate
pipes downstream of the heat exchanger
(3).