Chapter 3 Fuel Injection Equipment
10. Jest Bench Adjustment of VE Pump
, 4LHA Seriei
* Warm-up operation: refer to the following:
1.
Standard
Type
VE
Pump
Attach
the pump to the pump test bench and
connect
the injection lines.
Using
the thermometer (see Fig. 23) measure
the fuel oil temperature in the fuel tank. Before
starting operation,
fill
the pump
with
test oil.
a) Apply the spedfied voltage to test the
pump's
magnetic valve.
Fix
the control lever in the maximum-speed
position.
Operate
the pump at the rated speed for
approx.
10 minutes.
b) Timer adjustment
Install the timing measuring device and
connect
the pressure gauge.
Total timer stroke is determined by the
timer piston length.
The
start of the timer piston stroke de-
pends
on the spring tension force and the
fuel oil feed pressure; the spring tension
force is determined by the shims inside the
timer cover. Usually, at least one shim (0.6
mm) is placed on each side of the timer
spring.
Adjust the regulating valve so
that
the timer
advances
at the specified
speed.
c)
Supply pressure test
During timing adjustment, the pump cham-
ber
pressure must be
within
the specified
range.
d) Full-load fuel injection quantity adjustment
Adjust the full-load fuel injection quantity
through the full-load adjustment screw, and
by adjusting the tension lever attached to
the control
sleeve.
Before
adjustment, confirm
that
at the
measuring
point speed is as specified. Set
the control lever to the maximum-speed
position by rotating the adjusting screw.
Adjust the full-load point by measuring the
fuel injection quantity and referring to the
specifications.
The measuring point at all
speeds
must be
within
the specified range.
The
fuel injection quantity for each cylinder
must not exceed the specified quantity.
e)
Idling
adjustment
Adjust the idling fuel injection quantity us-
ing the control lever.
The
fuel injection quantity for each cylinder
must not exceed the specified quantity.
f) Governing adjustment
Adjust the governing performance using
the control lever. The governing point is
reached
when the full-load fuel injection
quantity begins to decrease, provided the
adjusting screw is set at a position ensuring
governor
operation.
g) Measurement of overflow quantity
Measure
the overflow quantity at the
speci-
fied speeds using a measuring cylinder.
Compare
the measurement
with
the
specified
quantities.
h) Measurement of fuel injection quantity for
engine
starting
Control
the starting fuel injection quantity at
the specified
speeds.
Set the control lever
to the maximum-speed position to adjust
the starting stroke.
i) Control lever angle (see Fig. 24)
Adjust the control lever angles and
dimensions
given below, referring to the
specifications.
a;
Idling
position/center position angle
P;
Idling/maximum-speed position angle
y; Idling/partial load position angle
a;
Distance from the end of idling stopper
to its boss portion
b; Distance from control lever idling
posi-
tion
to maximum-speed stopper
c;
Distance from control lever partial load
position to idling stopper
3-1-53
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