Chapter 3 Fuel Injection Equipment
4. Adjustment of Fuel Injection Pump and Governor
4LHA Series
(A) Slowly rotate the pump in the normal rotation
direction by hand, and measure the plunger
lift
until
fuel flow stops from the overflow pipe on the
measuring
device.
Pre-stroke
See separate service data
(5) If the measured pre-stroke is not standard, adjust
by changing the shim thickness between the f
lange
of the plunger barrel and pump body.
mm
Adjusting shims thickness
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
(6) Repeat the above procedure to adjust the pre-
stroke of each cylinder.
(7) After adjustment is completed, insen the gasket,
delivery valve, delivery valve holder and spring.
Tighten the delivery valve holder.
No.
of cylinders
3
4
Injection
order
t
-2-3-1
1-3-4-2-1
Injection
interval
120°
90°
Allowable
deviation
±30'
(3) Readjust the pre-stroke of cylinders
that
are not
within
the allowable deviation (increasing the
adjusting shim thickness makes the injection
timing slower, and decreasing makes it faster).
The
change in injection timing effected by the
adjusting shims is as follows:
Change
in shim thickness
Change
in injection timing
Change
in shim thickness
Cam
angle
Crank
angle
0.1 mm (0.0039 in.)
0.4°
0.8°
Delivery
valve holder
tightening torque
39.2-44.1 (4.0~4.5)N(kgO-m
4-3
Adjusting
injection
timing
After adjusting the pre-stroke for all cylinders, check/
adjust the injection timing.
(1)Set the governor control lever in the operating
position (bring the plunger to the effective injec-
tion
range),
turn
the camshaft clockwise, and
check
the injection starting time (FID) of cylinder
No.
1
(start
of fuel discharge from the delivery
retainer).
Cylinder
No.
Count
from the drive side
Direction of rotation
Right looking from drive side
(2) Now set the tester needle on the flywheel
scale
in a
position where it is easy to read, and check the
injection timing several times according to the
injection order.
3-2-33
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