Arion 640-510 – 09.2008 – GB
A2
CYLINDER HEAD AND VALVES
A2.2
Arion 640-510 – 09.2008 – GB
Cylinder head and valves
Locally made tool
Injector coupling puller
A = 23 mm
B = 15 mm
C = 50 mm
D = 20 mm
E = 22 x 250 mm
F = 180 mm (Subhead)
134hsm06
Fig. 1
Rocker caliper
A = 3 mm
B = 15 mm
C = 50 mm
324hsm97
Fig. 2
F
E
C
D
B
A
C
B
A
Arion 640-510 – 09.2008 – GB
A2.3
Cylinder head and valves
Inspecting valve bridges
– Clean the valve bridges and check they are not
damaged.
– Measure the boreholes of the valve bridges (A) and
check that the gap between one bore and another does
not exceed the value specified.
Maximum gap between bores............................... 0,1 mm
134hsm07
Fig. 3
Inspecting the rocker pin
Note: Mark the location of the rockers when removing
in order to facilitate refitting.
– Remove the caps (A) only to change them or to clean
the rocker axis.
– Disassemble and search for traces of wear or damage.
Change all parts which are damaged or non compliant
with specifications.
134hsm08
Fig. 4
Outer diameter of the axis ................19,962 - 20,038 mm
Wear limit ..........................................................19,91 mm
134hsm09
Fig. 5
A
A
A2.4
Arion 640-510 – 09.2008 – GB
Cylinder head and valves
Inner diameter of the rocker..............20,065 - 20,115 mm
Wear limit ..........................................................20,16 mm
134hsm10
Fig. 6
Inspecting the rockers
– Remove and clean the rockers (A). Mark them for
refitting.
134hsm11
Fig. 7
– Measure the outer diameter of the rockers. If it is below
the value recommended, change it.
Specified value:
Rocker outer diameter ..........................31,61 - 31,64 mm
– Measure rocker clearance in the bore.
Specified value:
Bore diameter
(in the block) .........................................31,70 - 31,75 mm
Rocker and borehole clearance ................0,06 - 0,13 mm
– Check the head on the rocker journals. If it is flat or
concave, change the rocker and check the camshaft
lobes.
134hsm12
Fig. 8
A
Arion 640-510 – 09.2008