- 3-43-9 -
4) Slowly rotate the pump in the normal rotation direc-
tion by hand, and measure the plunger lift until fuel
flow from the overflow pipe on the measuring device
stops.
Pre-stroke : See separate service data
5) If the measured pre-stroke is not standard, adjust by
changing the shim thickness between the flange of the
plunger barrel and pump housing.
6) Repeat the above procedure to adjust the pre-stroke of
each cylinder.
7) After adjustment is completed, insert the delivery
valve, delivery valve holder and spring.
Tighten the delivery valve holder.
(3) Adjustment of injection timing
After adjusting the pre-stroke for all cylinders, check and
adjust the injection timing.
1) Set the governor control lever in the operating position
(bring the plunger to the effective injection range),
then turn the camshaft clockwise, and check the injec-
tion starting time (FID) of No.1 cylinder (start of fuel
discharge from the delivery valve holder).
2) 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) Readjust the pre-stroke of cylinders that are not within
the allowable deviation (increase of the adjusting shim
thickness makes the injection timing later, and
decrease makes it earlier).
The change in injection timing by the adjusting shims
is as follows.
(4) Plunger pressure test
1) Mount the pressure gauge to the delivery valve holder
of the cylinder to be tested.
2) Set the governor control lever in the stop position,
operate the injection pump at about 200 rpm, and
make sure that the pressure gauge reading is 49 MPa
(500 kgf/cm
2
) or more. All the time lightly move the
control rack towards fuel increase side.
Replace the plunger if the pressure does not reach this
value.
3) Check to see that oil is not leaking from the delivery
valve holder or fuel injection piping, and there is no
extreme drop in pressure.
(5) Delivery valve pressure test
1) Connect a pressure gauge to the delivery valve holder.
(Refer to plunger pressure test.)Drive the pump at 200
rpm and, moving the control rack, apply a pressure of
12 MPa (120 kgf/cm
2
).
2) Set the control rack to the 0 mm position and measure
the time required for the pressure to drop from 10 MPa
(100 kgf/cm
2
) to 9 MPa (90 kgf/cm
2
).
If the pressure drops faster than this, wash the delivery
valve, and retest. Replace the delivery valve if the
pressure drop is not remedied.
Delivery valve holder
tightening torque
98
㨪
118 N
m
(10
㨪
12 kgf
m)
Cylinder No.
Count from drive coupling side
Direction of rotation
View from drive coupling side
Injection order
1-4-2-6-3-5
Injection interval
60
q
Allowable deviation
r
30'
Adjusting thickness of shim
Change of injection timing
Cam angle
Crank angle
0.1 mm (0.0039 in.)
0.35
q
0.7
q
Thickness of
shims
Standard
3.0 mm (0.118 in)
Applicable
2.5
㨪
3.5 mm
(0.984
㨪
1.378 in)
(t = 0.1 mm step)
Max. pressure gauge reading
98.1 MPa
(1000 kgf/
cm
2
)
Connecting screw dimensions
M14
1.5
Pressure drop limit
20 seconds minimum
Summary of Contents for 6CXM-GTE
Page 1: ...SERVICE MANUAL MARINE DIESEL ENGINE M9961 H13021 6CXM GTE GTE2 ...
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