- 72 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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Injection timing correction by changing the pad thickness
Should it be necessary to correct the injection static advance,
remove the injection pump from the engine block and replace pad
B inside the injection tappets with one of a different thickness (to
extract pad B use a magnet C).
Its value is printed on the lower part of the pad.
Eight spare pads are supplied for the advance variations and their
thickness can vary from 4 to 4.7 mm.
The gasket A,betweentheinjectionpumpangeandtheengine
block, is only one, with the only task of preventing any possible
oil leaks.
Previously, to vary the injection advance, gaskets of different
thicknesses were used between the injection pump surface and
the engine block surface (in effect, gasket A without sealing rubber
border).
Injector setting
Connect the injector to a injection test stand and check that the
pressure setting is 140 / 150 bar.
Adding the shims 9 increases the pressure setting, reducing their
number lowers it.
Eleven spare setting shims 9 are included, their measurements
range from 1 to 2 mm.
When spring 10 is replaced, calibration must be carried out at a
pressure 10 bars higher than the nominal pressure (160 bar) to
counterbalance bedding in the operation.
Check needle valve sealing by slowly moving the hand pump
until approximately 120 bar per 10 seconds.
Replace nozzle 12 in case of dripping.
The torque of the injector ring nut is 70 ÷ 90 Nm.
Whenever maintenance operations are carried out on the
injector replace the seal ring 1.
Introduce seal ring 1 into the injector housing with the sealing
surfacefacingupwards(seegure171).
See page 22 for maintenance intervals.
Fix injector to the head tightening to 70 Nm.
Injector (pin type)
Components:
1 Fuel inlet 7 Delivery union
2 Filter 8Backowunion
3 Body 9 Setting shims
4 Delivery duct 10 Pressure spring
5 Pad 11 Pressure pin
6 Clamping ring nut 12 Nozzle
13 Fireproof bulkhead
Fuel system
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