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- 40 -
Disassembly / Reassembly
20
Workshop Manual LDW CHD _ cod.
Rocker arm assemly
Loosen the screws which fasten the assembly to the head.
When refitting apply a drop of Loctite 270 onto the threads.
When refitting tighten to 50 Nm.
Inside the rocker arm pin flows the oil that lubricates the rocker
arms and feeds the hydraulic tappets.
To clean the rocker-arm pin inside, remove the two tightening
screws C at the ends (fig. 17).
To check the pin and the rocker-arm pin bearings for wear compare
the measured values with the parameters in the table below.
Table of pin-rocker arm dimensions
Dimensions
Ref.
(mm)
Ø A*
14,032 ÷ 14,050
Ø B
13,989 ÷ 14,000
* With bushing fitted to the rocker arm and reamed.
Cylinder head
Warning
• Do not demount when hot or the part could become deformed.
Do not remove when hot to avoid deformation.
Check cylinder head plane using a metal straight edge and
thickness gauge; if warpage exceeds 0.10 mm, level off by
removing a maximum 0.20 mm.
See pictures 56÷59 for cylinder head tightening.
Valve removal
Components:
1 - Valve
2 - Lower spring seat
3 - Valve guide seal (for intake only)
4 - Spring
5 - Spring cap
6 - Cotters
To remove the cotters firmly press down as shown in the figure
20.
Clearance
Limit value (mm)
(mm)
ØA-ØB =
0,014
0,043 ÷ 0,050
ED0053031210 - 1° ed_rev. 00
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