12
SECTION 10 -- ENGINE -- CHAPTER 1
603.54.381.00
-- 05 -- 2001
MODELTK 85 -- CALIBRATION DATA FOR BOSCH INJECTION PUMP
TYPE VE 4/11 F 1250 L 773 -- 99472102 / VE 4/11 F 1250 L 787 -- 500324962
ASSEMBLY DATA
Pump timing on engine: delivery start 9
o
±
0.5
o
before
TDC of cylinder 1 compression stroke.
Plunger pre--lift for timing on engine: 1 mm (0.0394
in.) from BDC (with tools
291754
--
291755
).
Cylinder No.1 delivery line union on pump: marked
with letter A.
ASSEMBLY DIMENSIONS
SYMBOL
K
KF
r
ya
yb
mm
(in.)
--
--
30.1
(1.185)
36.5 to 38.5
(1.437 to
1.5157)
37.4 to 42.6
(1.4724 to
1.6772)
CALIBRATION TEST CONDITIONS
Test bench conforming to ISO 4008/1 .../2
Injectors
conforming
to
ISO
7440--A61
--
(1.688.901.027 with calibrated pad
Æ
0.5 mm --
0.0197 in.).
Injector pressure setting 250 to 253 bar (3626 to
3669 psi).
Fuel supply pressure:
0.35 + 0.05 bar (5.1 + 0.7 psi).
. . . . . .
Delivery pipes (conforming to ISO 4093.2):
6 x 2 x 450 mm (0.2362 x 0.0787 x 17.716 in.).
. . . . . .
Graduate drain time
: 30”.
. . . . . . . . .
Test liquid: ISO 4113 at a temperature of 45
o
±
1
o
C
(113
o
±
33.8
o
F) at outlet.
1. START OF DELIVERY
Plunger pre--lift from TDC:
mm --
Pump rotation (viewed from drive side): coun-
ter--clockwise
Injection order:1--3--4--2
2. ADVANCE REGULATOR STROKE
rpm: 900
Advance stroke: 0.7 to 1.1 mm (0.0276 to 0.0433 in.)
3. FUEL SUPPLY PUMP PRESSURE
rpm: 900
Internal pressure: 6.7 to 7.3 bar (97.2 to 105.9 psi)
4. FULL LOAD DELIVERY
rpm: 800
Delivery per 1000 shots: 61.2 to 62.2 cm
3
(0.0135 to 0.0137 gal.) Spread:
£
3.5 cm
3
(0.0008 gal.)
5. SPREAD GOVERNOR AT IDLE SPEED
rpm: 300
Delivery per 1000 shots: 9.2 to 10.2 cm
3
(0.002 to 0.0022 gal.)
Spread:
£
-- cm
3
6. SPREAD GOVERNOR AT MAXIMUM SPEED
rpm: 1300
Delivery per 1000 shots: 41.1 to 42.1 cm
3
(0.0090 to 0.0092 gal.) Spread:
£
3.5 cm
3
(0.0008 gal.)
7. DELIVERY AT STARTING SPEED
rpm: 100
Delivery per 1000 shots: 33 to 73 cm
3
(0.0073 to 0.0161 gal.)
8. TRANSFER PRESSURE PROGRESSION
rpm
900
450
Internal pressure supply:
bar (psi)
6.7 to 7.3 (97.2 to 105.9 psi)
4.3 to 5.3 (62.4 to 76.9 psi)
9. INJECTION ADVANCE PROGRESSION
rpm
900
1020
Advance stroke
mm (in.)
0.7 to 1.1 mm (0.0276 to 0.0433)
1.3 to 1.9 (0.0512 to 0.0748)
10. BACKFLOW
rpm
450
1250
Backflow for 10 s
cm
3
(gal.)
18 to 30 (0.0040 to 0.0066)
24 to 40 (0.0053 to 0.0088)
(continued)
Note: the values shown above in brackets must be used for checking purposes only.
