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6
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.
2. See "Disassembling the rocker arms" for the correct
procedure.
3. Bore a hole in the blocking pin (A), using a 4mm bit to
remove it.
4. Extract the supports and the rocker arm from the
pivot pin (B).
5. 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").
Table of dimensions pin-rocker arm
Table of dimensions pin-rocker arm
Dimensions
Réf.
(mm)
Ø a
17,989÷18,000
Ø b
18,015÷18,030
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.
50
OVERHAULS AND TUNING
Wear and
Clearance
tear limit
(mm)
(mm)
Ø a - Ø b =
0,090
0,015÷0,041
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
A
62
63
64
B
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