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Chapter 3 Fuel Injection Equipment
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3,4JH3(B)(C)E
4~4 Plunger pressure test
(1) Mount the pressure gauge to the delivery retainer of
the cylinder to be tested.
Max. pressure gauge reading
1000 kg/cm'
Connecting screw dimensions
M12X1.5
(2) Set the governor control lever to the stop position,
operate the injection pump
al
about
200 rpm,
and
make sure that the pressure gauge reading is
500
kg/cm' (7110 lb/in.'} or more while lightly moving the
control pinion gear towards lull throttle (ddve side)
from the pump.
Replace the plunger if the pressure does not reach
this value.
(3)
Immediately release the gear after the pressure rises
to stop injection
At the same time, check to see that oil is not leaking
from the delivery retainer or fuel injection piping, and
that there is no extreme drop in pressure.
4~5 Delivery valve pressure test
(1}
Perform the plunger pressure test in the same way,
bringing the pressure to about 120kg/cmi {1706 !bin.:>),
and then stopping injection.
Pressure gauge
(2) After pressure rises to the above value, measure the
time
it
takes to drop from
100~90
kg/cm:> .
100--+90 kg/cm•
5 seconds
lf
the pressure drops faster than this, wash the deliv-
ery valve, and retest Replace the delivery valve
if
the
pressure continues to drop rapidly.
Printed in Japan
HII\SHI-H8009
3-27
4~6 Adjusting injection volume
(uniformity of each cylinder)
The injection volume
is
determined by the fuel injection
pump rpm and rack position. Check and adjust to bring to
specified value.
4-6.1 Measuring injection volume
(1)
Preparation
Set the pump rpm, rack position and measuring stroke
to the s ecified value and measure:
Engine model
3JH3(B)(C)E
j
4JH3{B)(C)E
Pump RPM
1900 rpm
Pump
rotating
direclion
Right
looking from drive side
Rack
indicator scale reading
7mm
I
8mm
Remove the rack stop bolt behind the pump and screw
in the rack fixing bolt to fix the rack.
4
¢3
~
i
Part
Code
No.
(2)
Measuring injection volume
158090-51510
Measure the injection volume at the standard stroke,
and adjui=;t
as
follows ii it is not within the specified
value.
Measuring stroke
Specified injection volume
at standard rack position
Non uniformity of
cylinders
1,000
st
See injection pump
service data
±3%,
4·6.2 Adjustment of injection volume
Measure the injection volume in measuring cylinders for
each cylinder, and adjust if necessary to obtain 1he speci-
fied values.
(1) Push the control rack all the
W8:Y
to the driveside, stop
with the rack fixing bolt, and loosen the pinion/sleeve
fixing bolt 1/3 of a revolution.
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