Lombardini LDW 502, Service Manual

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service manual
mod. 051135
6
a Ø 0 0 0 , 8 1 ÷ 9 8 9 , 7 1
= b Ø - a Ø
1 4 0 , 0 ÷ 5 1 0 , 0
0 9 0 . 0
b Ø 0 3 0 , 8 1 ÷ 5 1 0 , 8 1
B
A
6.3.2 Checking and overhauling the rocker
arm pin
1 - In order to carry out a control of the rocker
arm assembly, it is necessary to
disassemble the cylinder head.
See “Disassembling the rocker arms” for
the correct procedure.
2 - Bore a hole in the blocking pin (A), using
a 4mm bit to remove it.
3 - Extract the supports and the rocker arm
from the pivot pin (B).
4 - Thoroughly clean the components.
5 - Using a micrometer measure, the
diameters of the pivot pin and the rocker
arms (see “Table of dimensions pin-rocker
arm”).
If the diameters do not correspond to the values
shown, replace the pin and, if necessary, the
rocker arms with original spares.
If the pin can be re-used, remove the plugs and
clean the inside carefully, to eliminate residual
dirt.
6 - Place the new plugs in the pin.
7 - Carefully clean and lubricate the supports
and rocker arms and remount on the pin.
Dimensions
Clearance
(mm)
Tear &
wear limit
(mm)
Ref.
Table of dimensions pin-rocker arm
OVERHAULS AND TUNING