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11
Injection equipment
32
33
34
35
- 26 -
Checking the injection pump
before demounting the injection pump, make sure that the
plunger unit, enbloc pump casing and valve are pressure tight by
proceeding in the following way:
1. Connect a pressure gauge with scale up to 600 Kg/cm² to the
fuel delivery pipe (fig. 32).
2. Set the regulating sleeve (fig. 33) to the average delivery
position.
3. Slowly turn the flywheel to make the plunger make one
compression stroke.
4. Read the indication on the pressure gauge. If it is lower than
300 Kg/cm², the complete pump must be changed.
During the test, the pressure gauge needle will show a
progressive pressure increase until reaching a maximum value,
after which it will drop sharply back and stop at a lower pressure
value. Replace the valve if the pressure drop is more that 50 Kg/
cm² and continues to slowly drop lower.
The pressure must drop from 200 Kg/cm² to 150 Kg/cm² in not
less than 7 sec.
Injection pump calibration (fig. 34)
When the adjuster sleeve is 10.5 mm from the stop position
and the pump spins at 1,500 rpm, the amount of fuel for 1,000
deliveries must be between:
Replace the pump if the values differ.
WARNING:
Check to make sure that plunger travel with the injection cams in
the non-operative position (BDC) at the start of delivery is:
Injection pump assembly (fig. 36)
If the injection pump must be demounted, use an electric pen to
mark the adjuster block (M) with the enbloc pump casing (A) and
loosen the plug (N) after having heated it to make the Loctite
easier to release.
Comply with the following instructions when remounting the
parts:
1. Fit the washer (B), the delivery valve (C), the washer (D), the
alve spring (E), the filler (F) into the enbloc pump casing (A)
and torque the delivery union (G) to a value of:
4,3 ÷ 5,4 kgm (42,5 ÷ 52,5 Nm)
2. Insert the adjuster seal (H).
3. Insert the flange (I).
4. Insert the plunger with helical profile (A, fig. 35) into the iner
housing of the adjuster sleeve from the side opposite the
sleeve pin (B, fig. 35).
Workshop Manual KD500 _ cod. ED0053029390 - 1° ed_rev. 00
25,5 ÷ 29 cc
25,5 ÷ 29 cc
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