Yanmar 6CXM-GTE2 Service Manual download pdf (Page 97)

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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

) 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) 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

) to 9 MPa (90 kgf/cm

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

60q

Allowable deviation

r 30'

Adjusting thickness of shim

Change of injection timing

Cam angle Crank angle

0.1 mm (0.0039 in.)

0.35q 0.7q

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/

)

Connecting screw dimensions

M14  1.5

Pressure drop limit 20 seconds minimum

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 131 132

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Yanmar 6CXM-GTE2 Service Manual Page 97

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