12
SECTION 10 -- ENGINE -- CHAPTER 1
6-62720 -- 09 -- 2006
JX90 MODEL -- CALIBRATION DATA FOR BOSCH INJECTION PUMP
TYPE VE 4/12 F 1250 L 982 -- 504042214
ASSEMBLY DATA
Pump timing onengine: delivery start 1
o
± 0.5
o
before
T.D.C. of cylinder 1 on compression stroke.
Plunger pre--lift for timing on engine: 1mm from BDC
(with tools 380000228 -- 380001601).
Delivery union of the pump corresponding to cylinder
no. 1: marked with letter A.
ASSEMBLY DIMENSIONS
SYMBOL K A MS ya yb
mm 3.64 to
3.76
1.4 to
1.5
0.7to0.9 37.9 to
39.9
39.3 to
44.7
CALIBRATION TEST CONDITIONS
Test bench conforming to ISO 4008/1 .../2
Injectors conforming to ISO 7440--A61 --
(1.688.901.027 with calibrated pad ∅ 0.5 mm
(0.0197 in.)).
Injector pressure setting 250 to 253 bar (3625.925 to
3741.9546 psi).
Fuel supply pressure:
0.35 ±0.05 bar (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”.
Test liquid: ISO 4113 at a temperature of 55
o
± 1
o
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--3--4--2
2. ADVANCE REGULATOR STROKE
rpm: 1250 Advance stroke: mm 2.4 to 3.6
3. FUEL SUPPLY PUMP PRESSURE
rpm: 1250 Internal pressure: bar 8.7 to 10.1
4. FULL LOAD DELIVERY
rpm: 900 Delivery per 1000 shots: cm
3
77.5 to 82.5 Spread: cm
3
≤ 3.5
5. SPREAD GOVERNOR AT IDLE SPEED
rpm: 375 Delivery per 1000 shots: cm
3
5.5 to 19.5 Spread: cm
3
≤ 4.5
6. SPREAD GOVERNOR AT MAXIMUM SPEED
rpm: 1250 Delivery per 1000 shots: cm
3
69.5 to 75.5 Spread:--
7. DELIVERY AT STARTING SPEED
rpm: 100 Delivery per 1000 shots: cm
3
80 to 120
8. INJECTION ADVANCE PROGRESSION
Rev/min 1000 1250
Advance stroke mm 0.2to1.0 2.4to3.6
9. TRANSFER PRESSURE PROGRESSION
Rev/min 1250 400
Internal pressure bar 8.7 to 10.1 3.6to5.0
10. BACKFLOW
Rev/min 400 1250
Backflow l/h 15 to 29 22 to 40
(continued)
Note: The values shown above in brackets must be used for checking purposes only.
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