Lombardini CHD series - Valve Train Components; Rocker arm assembly; Cylinder head; Valve removal

- 31 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
AØ * 230,41 ÷ 050,41
=BØ-AØ
050,0÷340,0
410.0
BØ 000,41÷989,31
4
19
18
17
16
20
Rocker arm assemly
Loosen the screws which fasten the assembly to the head.
 Whenrettingtightento50Nm.
Insidetherockerarmpinows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(g.17).
WhenrettingapplyadropofLoctite270ontothethreads.
Clearance
(mm)
Limit value (mm)
Dimensions
(mm)
Ref.
Disassembly / Reassembly
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rmlypressdownas showninthegure
20.
Cylinder head
Caution – 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 (pages 39÷40) for cylinder head
tightening.
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
* Withbushingttedtotherockerarmandreamed.