Control And Adjustment Of The Injection Timing - Komatsu PC20R-8 Shop Manual

TESTING AND ADJUSTMENTS

CONTROL AND ADJUSTMENT OF THE INJECTION TIMING

H Check the injection timing of the N
means of the N .1 union of the injection pump.
o
H The cylinders are numbered 1-2-3 counting from the
flywheel side.
H The spark advance notches of 0ë-10ë-15ë-20ë; are
also marked on the flywheel. In order to read the inter-
mediate values, sub-divide the sections between the
two marks into equal lengths.
1 - Remove the cap (1) of the flywheel casing.
2 - Pass a screwdriver between the teeth and rotate the
flywheel in a counter-clockwise direction (as seen
from the flywheel side) until the 1/3 notch of the fly-
wheel is aligned with the notch (2) marked inside
the hole in the casing.
H In this position, the piston of the N
at the top dead centre (B.T.D.C.). Check that the
cylinder is in a compression stroke, i.e. that both
valves are closed.
H Once the B.T.D.C. has been ascertained, rotate
the drive shaft in a clockwise direction (seen from
the flywheel side) for about 25 teeth.
3 - Take off the clamp (3) and disconnect all the fuel de-
livery tubes (4) from the injection pump.
4 - Rotate the flywheel slowly in a counter-clockwise di-
rection (seen from the flywheel side), checking care-
fully the level of the fuel in the No. 1 union of the in-
jection pump. Stop the rotation when the fuel level
starts to rise.
5 - Check the position of the notches at 15ë and 10ë that
appear in the hole in the casing and, in function of the
position, establish the true fuel injection timing.
H In order to determine the degrees of intermediate
fuel injection timing, sub-divide the space be-
tween 10ë and 15ë.
H Normal fuel injection timing: 14w1ë
PC20R-8 PC27R-8
CONTROL AND ADJUSTMENT OF THE INJECTION TIMING
.1 cylinder by
o
. 1 cylinder is
o
1
2
4
15°
20°
10°
15°
10°
1/3
Notch
2
RKPA0011
RKPA3190
RKPA0060
3
RKPA2151
20-29