Belarus 1021, Руководство по эксплуатации

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BELARUS-1021/1021.3 Operating manual
187
Operation 61. Check and adjust fuel pump on test bench
Remove the fuel pump from the engine to send it to a special shop.
Attention: the fuel pump is adjusted by a dealer at a specialized workshop using
special equipment!
Attention: the fuel pump must be removed from and installed on the engine only by a
qualified technician!
Operation 62. Check and adjust setting advance angle of fuel injection on
engine
Attention: In case of difficult engine start, smoky exhaust, and during replacement or
installation of the fuel pump after checking on the bench after 2,000 service hours or an
engine repair, always check and, as necessary, adjust the setting advance angle of fuel
injection on the engine!
The method of checking and adjusting the setting advance angle of fuel injection on the
engine depends on the make of the fuel pump installed on the diesel engine of your tractor. The
fuel pump designation is on the nameplate located on the fuel pump housing.
Check and, if necessary, adjust the setting advance angle of fuel injection with fuel
pumps 772, 773 (YAZDA OJSC), proceeding as follows:
- set the piston of the first cylinder to the compression stroke at 40-50°to UDC;
- set the regulator control lever to the position corresponding to the maximum fuel supply;
- disconnect the high-pressure pipe from the union of the first section of the pump and
instead of it connect a check device being a high-pressure pipe segment 100 to 120 mm long with a
packing nut on one end and the second end bent aside by 150 to 170°C as per Fig. 8.4.57;
- fill the fuel pump with fuel, bleed air from the low-pressure system and create a positive
pressure using the priming pump until a continuous jet of fuel emerges from the tube of the check
device;
- slowly rotating the engine crankshaft clockwise and maintaining a positive pressure in the
pump head (using the priming pump), watch the fuel flowing out of the check device. When the
fuel ceases to flow (dropping is allowed of up to 1 drop per 10 seconds), quit rotating the
crankshaft;
- unscrew, in accordance with Fig. 8.4.58, the latch from the threaded hole of the back plate
and insert it upside down into the same hole up to stop against the flywheel, at that the latch must
align with the hole in the flywheel (this means that the piston of the first cylinder is set to the
position corresponding to the setting advance angle of fuel injection specified in Table Diesel engine
parameters on page 16 of this Manual).
If the latch does not align with the hole in the flywheel, make an adjustment, proceeding as
follows:
- remove the hatch cover as per Fig. 8.4.59;
- align the latch with the flywheel hole rotating the crankshaft to one direction or the other;
- release by 1...1.5 turns the nuts fastening the fuel pump drive pinions;
- using a wrench, turn the fuel pump shaft by the nut counterclockwise until the pins stop
against the groove edged of the fuel pump drive pinion;