Iveco Stralis AT/AD. Manual — part 31
1. Fuel valve - 2. Pumping element - 3. Fuel outlet -
4. Filling and backflow passage
0 411 700 002
XXXXXX XXXX X
868 USA /
60669
Figure 218
For each injector replaced, hook up to the MODUS station
and, when asked by the program, enter the code punched on
the injector (
→) to reprogram the control unit.
Injector Phases
When checking the clearance of the rocker arms, it
is important to check the injector-pump pre-load.
!
Filling phase
During the filling phase the pumping element (2) runs up to
the top position.
After passing the highest point of the cam, the rocker arm
roller comes near the base ring of the cam.
The fuel valve (1) is open and fuel can flow into the injector
via the bottom passage (4) of the cylinder head.
Filling continues until the pumping element reaches its top
limit.
Figure 219
110
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
Injection phase
The injection phase begins when, at a certain point in the
down phase of the pumping element, the solenoid valve gets
energized and the fuel valve (1) shuts.
The moment delivery begins, appropriately calculated by the
electronic control unit, depends on the working conditions
of the engine.
The cam continues with the rocker arm to push the pumping
element (2) and the injection phase continues as long as the
fuel valve (1) stays shut.
1. Fuel valve - 2. Pumping element - 3. Fuel outlet -
4. Filling and backflow passage
1. Fuel valve - 2. Pumping element - 3. Fuel outlet -
4. Filling and backflow passage
60670
Figure 220
60671
Figure 221
Pressure Reduction phase
Injection ceases when the fuel valve (1) opens, at a certain
point in the down stroke of the pumping element, after the
solenoid valve gets de-energized.
The fuel flows back through the open valve (1), the injector
holes and the passage (4) into the cylinder head.
The time for which the solenoid valve stays energized, ap-
propriately calculated by the electronic control unit, is the
duration of injection (delivery) and it depends on the working
conditions of the engine.
ENGINE F2B
111
S
TRALIS
AT/AD
112
ENGINE F2B
S
TRALIS
AT/AD
Base - January 2003
113
S
TRALIS
AT/AD
F3A ENGINE
Page
VIEWS OF THE ENGINE
115
. . . . . . . . . . . . . . . . . .
TECHNICAL DESIGNATION
119
. . . . . . . . . . . . . . .
CHARACTERISTIC CURVES
120
. . . . . . . . . . . . . . .
GENERAL CHARACTERISTICS
122
. . . . . . . . . . . . .
ASSEMBLY CLEARANCE DATA
125
. . . . . . . . . . . .
TIGHTENING TORQUE
131
. . . . . . . . . . . . . . . . . .
TOOLS
137
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DISMANTLING THE ENGINE ON THE BENCH
149
REPAIR OPERATIONS
156
. . . . . . . . . . . . . . . . . . . .
CYLINDER BLOCK
156
. . . . . . . . . . . . . . . . . . . . . . .
-
Checks and measurements
156
. . . . . . . . . . . . . . .
CYLINDER LINERS
157
. . . . . . . . . . . . . . . . . . . . . . .
-
Replacing cylinder liners
158
. . . . . . . . . . . . . . . . . .
CRANKSHAFT
159
. . . . . . . . . . . . . . . . . . . . . . . . . .
-
Measuring the main journals and crankpins
160
. . .
-
Preliminary measurement of main and big end
bearing shell selection data
161
. . . . . . . . . . . . . . .
-
Selecting the main and big end bearing shells
162
. .
-
Replacing the timing gear
and oil pump
168
. . . . . . . . . . . . . . . . . . . . . . . . . .
-
Checking main journal assembly clearance
168
. . . .
-
Checking crankshaft end float
169
. . . . . . . . . . . . .
PISTON CONNECTING ROD ASSEMBLY
170
. . . .
-
Piston rings
172
. . . . . . . . . . . . . . . . . . . . . . . . . . .
CONNECTING RODS
173
. . . . . . . . . . . . . . . . . . . .
-
Bushings
174
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
-
Checking connecting rods
174
. . . . . . . . . . . . . . . .
-
Mounting the connecting rod — piston assembly
175
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