6
SECTION 10 -- ENGINE -- CHAPTER 1
6-62720 -- 09 -- 2006
JX60 MODEL -- CALIBRATION DATA FOR BOSCH INJECTION PUMP
TYPE VE 3/12 F 1250 L 976 -- 504054473
ASSEMBLY DATA
Pump timing on engine: delivery start 4° ± 0.5°
before TDC of cylinder 1 compression stroke.
Plunger pre--lift for timing on engine: 1mm from BDC
(with tools 380000228 -- 380001601).
Cylinder no. 1 delivery line union on pump: marked
with letter A.
ASSEMBLY DIMENSIONS
SYMBOL K KF MS1 ya yb
mm 3.6to3.8 3 0.85 to
1.15
36.9 to
40.9
41.5 to
46.5
CALIBRATION TEST CONDITIONS
Test bench conforming to ISO 4008/1.../2
Injectors conforming to ISO 7440--A61 --
(1688901027 with pad ∅ 0.5 mm)
Injector setting pressure: 250 bar (3625.925 psi).
Fuel supply pressure: 0.35 ±0.05 bar (kg/cm
2
).
(5.0763 ± 0.7252 psi).
Delivery pipes (conforming to ISO 4093.2):
6 x 2 x 450 mm (0.2362 x 0.787 x 17.7165 in.).
Graduate drain time: 30 seconds
Test liquid: ISO 4113 at a temperature of 55° ± 1°C
(131° ± 33.8°F).
1. START OF DELIVERY
Plunger pre--lift from BDC:
mm --
Pump rotation (viewed from drive side):
anticlockwise
Injection order:1--2--3
2. ADVANCE REGULATOR STROKE
rpm: 1150 Advance stroke: mm 1.6 to 2.0
3. FUEL SUPPLY PUMP PRESSURE
rpm: 1150 Internal pressure: bar 8.4 to 8.8
4. FULL LOAD DELIVERY
rpm: 800 Delivery per 1000 shots: cm
3
77.3 to 77.7 Spread: cm
3
--
5. SPREAD GOVERNOR AT IDLE SPEED
rpm: 325 Delivery per 1000 shots: cm
3
9.5 to 10.5 Spread: cm
3
≤ 5.0
6. SPREAD GOVERNOR AT MAXIMUM SPEED
rpm: 1300 Delivery per 1000 shots: cm
3
49.5 to 50.5 Spread:--
7. DELIVERY AT STARTING SPEED
rpm: 100 Delivery per 1000 shots: cm
3
70 to 110
8. INJECTION ADVANCE PROGRESSION
Rev/min 1250 1150 1050
Advance stroke mm 1.9to2.9 1.6to2.0 0.8to1.6
9. TRANSFER PRESSURE PROGRESSION
Rev/min 500 1150 --
Internal pressure bar 4.8to5.8 8.4to8.8 --
10. BACKFLOW
Rev/min 500 1250
Backflow cm
3
/10 s 44.5 to 77.7 58.3 to 97.1
(continued)
Note: The values shown above in brackets must be used for checking purposes only.
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