Section 7. Maintenance Procedures
Belarus 80.1/80.2/82.1/82.2/82
Р — Operation and Service Manual
89
CHECKING OF FUEL PUMP TIMING
In case of hard starting of the diesel-
engine, smoky exhaust, irregularities, as
well as replacing and installing the fuel
pump after MS-3 or repair, be sure to
check the point of commencement of fuel
injection on the pump.
For checking the point of fuel injection,
proceed as follows:
а) set the fuel feed control lever to a
position which corresponds to maxi-
mum fuel supply;
b) disconnect the high-pressure tube
from No. 1 cylinder pump element
and connect an ignition tester in-
stead (a union nut with a short tube
to which a 1…2-mm inner diameter
glass tube is connected by means of
a rubber tube);
c) turn the diesel-engine crankshaft us-
ing a wrench until fuel flows from the
glass tube in a stream that contains
no air bubbles;
d) remove a portion of fuel from the
tube and, while shaking it and slowly
turning the diesel-engine crankshaft
clockwise, observe the fuel level in
the tube. At the instant the fuel start to
rise, stop cranking the shaft;
e) unscrew the set bolt (1) (see Fig. 47)
out of the threaded hole in the rear
plate and insert it with its plain end
into the same hole till it comes to
abut against the flywheel. Now, the
set bolt should register with a hole in
the flywheel (in this position the No,
1 cylinder piston is just 24° before
TDC). In case of misalignment of the
set bolt and the hole, call a qualified
specialist to carry out the adjust-
ment.
Fig. 47
