Technical data

47
To increase the speed, turn out the adjusting screw and to decrease the speed turn it in,
as shown in Fig. 25(a). One turn of the screw varies the diesel engine speed by about 30-50 rpm.
If the rotational speed is difficult to adjust using the above method, it could be adjusted by varying
the working length of the governor spring 8, as shown in Fig. 25(c), increasing or reducing the
coils number by means of shackle 7.
The pump hourly capacity is adjusted by the nominal bolt 2 screwed into the rear wall of
the governor, as shown in Fig. 25(a). To increase the capacity screw the bolt in, to reduce – out.
The uniformity of fuel delivery and each section capacity are adjusted by means of the
turning bush 5 and plunger movement simultaneously relatively teeth crown 3, when the fixing
bolt 4 is loosened, as shown in Fig. 25(b). With the coupling screw 4 loosened turn the bush to
the left to increase the fuel delivery and to the right to reduce it.
The timing (angle of beginning of the fuel delivery) adjustment is performed by pusher
adjustment bolt 6. To reduce it, screw the bolt in, to increase – out.
The fuel pump of the D-245 diesel engine is equipped with pneumatic antismoke correc-
tor, which adjusts the fuel delivery depending on the supercharging pressure.
The fuel pump with the pneumatic antismoke corrector should be performed at the pres-
sure in the corrector of 8.7-1.2 psig (0.6-0.8 kgf/cm
2
). If the device for delivering compressed air
with the required pressure is not available, adjust the fuel pump with the pneumatic corrector re-
moved.
Upon adjusting the fuel pump parameters replace the pneumatic antismoke corrector and
check the value of he average cycle delivery in the rated speed mode.
Additionally, it is necessary to check the value of the average cycle delivery at the rota-
tional speed of 500 rpm and at zero pressure in the pneumatic corrector as well as the pressure
when the pneumatic corrector starts the operation.
To check the pressure of starting of the pneumatic corrector operation, it is necessary to
remove the cover 4 as shown in Fig. 26, set the rotational speed of 500 rpm and, while increasing
slowly the pressure from zero and above, observe the rod travel. The beginning of the rod travel
corresponds to starting of the pneumatic corrector operation. The pressure of starting of the
pneumatic corrector operation should be 2.18-2.9 psig (0.15...0.20 kgf/cm
2
).
If the pressure does not correspond to the specified values, it is necessary to perform the
adjustment using the bush 6. The pressure increases when screwing the bush in and decreases
when screwing it out.
After adjusting the pressure, it is necessary to adjust the cycle delivery using the stop 2
on the pneumatic antismoke corrector rod. To reduce the cycle delivery, the lock nut 1 should be
loosen and the stop should be screwed in until the required cycle delivery is obtained, to increase
the cycle delivery the stopper should be screwed out.
After completing the adjustment it is necessary to tighten the lock nut and replace the
cover 4. If the dowel 5 projects over the connector plane, unscrew the bush until the dowel is
flush with the connector plane.