Engines Iveco N45, N67. Manual — part 25
70169
Figure 12
TIMING SYSTEM
Camshaft
CAMSHAFT MAIN DATA (4 cyl.)
Specified data refer to pin standard diameter
Figure 13
MAIN DATA ABOUT CAMSHAFT PINS (6 F4HE684 engine cylinders)
Specified data refer to pin standard diameter
Camshaft pin and cam surfaces shall be absolutely smooth;
if they show any traces of seizing or scoring replace the
camshaft and the bushes.
84089
14
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
70171
70172
Figure 14
Figure 15
Check camshaft (2) pin diameter using micrometer (1) on
two perpendicular axes.
Camshaft bushes (2) shall be pressed into their housings.
Internal surfaces must not show seizing or wear.
Use bore dial gauge (3) to measure camshaft front and rear
bush (2) and intermediate housing (1) diameter.
Measurements shall be performed on two perpendicular
axes.
BUSHES
Checking cam lift and pin alignment
Set the camshaft on the tailstock and using a 1/100 gauge set
on the central support, check whether the alignment error
is not exceeding 0.04 mm, otherwise replace the camshaft.
Check cam lift; found values shall be: 6.045 mm for exhaust
cams and 7.582 mm for intake cams, in case of different values
replace the camshaft.
Figure 16
CAMSHAFT BUSH AND HOUSING MAIN DATA (4 cyl.)
* Value to be obtained after driving the bushes.
107399
Sec. A-A
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
15
F4HE NEF ENGINES
Print P2D32N003GB
Base - February 2006
Figure 17
Figure 18
MAIN DATA ABOUT CAMSHAFT BUSHES AND RELATED HOUSINGS
*Height to be obtained after driving the bushes.
70174
To replace front and rear bushes (1), remove and refit them
using the beater 99360362 (2) and the handgrip 99370006
(3).
Bush replacement
!
When refitting the bushes (1), direct them to make
the lubricating holes (2) coincide with the holes on
the block housings.
70175
MAIN DATA CONCERNING THE TAPPETS AND THE
RELEVANT HOUSINGS ON THE ENGINE BLOCK
Tappets
Figure 19
107268
sec. A-A
16
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F4HE NEF ENGINES
Base - February 2006
Print P2D32N00GB
70176
70164
70238
Lubricate the tappets (1) and fit them into the relevant
housings on the engine block.
Lubricate the camshaft bushes and fit the camshaft (1) taking
care not to damage the bushes or the housings.
Set camshaft (3) retaining plate (1) with the slot facing the
top of the engine block and the marking facing the operator,
then tighten the screws (2) to the specified torque.
Fitting tappets — camshaft
Figure 20
Figure 21
Figure 22
Figure 23
70179
70180
Check camshaft end float (1).
It shall be 0.23
± 0.13 mm.
Fit nozzles (2) and tighten the fastening screws (1) to the
specified torque.
Figure 24
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
17
F4HE NEF ENGINES
Print P2D32N003GB
Base - February 2006
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