Belarus 1021, Руководство по эксплуатации

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BELARUS-1021/1021.3 Operating manual
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Operation 63. Flush engine cooling system and change coolant
To flush the engine cooling system, proceed as follows:
- drain the coolant from the engine cooling system
- pour two liters of kerosene into the heat exchanger and fill the system with the prepared
solution (a solution to flush the engine cooling system — 50 to 60 g of soda ash per liter of water);
- start the engine and let it run for 8 to 10 hours, then drain the solution;
- fill the cooling system with pure water, start the engine and warm up it to the normal
operating temperature (70°C min.), then drain the water from the system;
- fill the cooling system with fresh coolant.
To drain the coolant from the engine cooling system, unscrew two drain plugs located on the
lower heat exchanger tank and the cylinder block on the right.
The coolant is filled in the engine cooling system through the filler neck of the heat
exchanger.
8.4.7 General maintenance
General maintenance is performed as necessary.
Operation 64. Adjust engine lubrication system oil pressure
- always watch the oil pressure on the pressure indicator located on the instrument panel
(when running a diesel engine with a rated speed and a coolant temperature 85 to 95°C, the oil
pressure must be 0.25 to 0.35 MPa, and on a cold engine a pressure up to 0.6 MPa is allowable);
If the lubrication system is operable (connections of oil lines are tight, the safety valve in
the oil filter is serviceable, etc.), but at the engine rated speed and the at normal operating
temperature of the coolant the oil pressure either is permanently above 0, 0.35 MPa, or is
permanently below 0.25 MPa, adjust the oil pressure in the engine lubrication system.
Adjust engine lubrication system oil pressure, proceeding as follows:
- unscrew the cap (3) (Fig. 8.4.61), remove the gasket (4);
- in the housing channel of the oil filter (2), using the screwdriver (6), turn the adjusting
plug (5) by one turn in the direction of increasing or decreasing the pressure (depending on the
actual pressure);
- install the gasket (4) to place and screw the cap (3);
- if necessary, repeat the above adjustment steps.
It is forbidden to make adjustments when the engine is running.
1 — oil filter; 2 — oil filter housing; 3 — valve cap; 4 cap gasket; 5 — adjusting plug; 6
— screwdriver; 7 — fluid-oil heat exchanger.
Fig. 8.4.61 – Adjust engine lubrication system oil pressure
Increase pressure
Decrease pressure