Table of Contents
Advertisement
6
6.3.6 Adjusting valve-rocker arm clearance
In order to make the adjustment, it is necessary to remove
the rocker arm cover.
See "Disassembling the rocker arm cover" for the correct
procedure.
Important
• Adjustment of valve clearance must be done when
the engine is cold.
1. Place the pistons at the compression top dead centre.
2. Turn the screw and the lock nut to adjust clearance.
Adjustment can be made in two different points:
the contact area between the rocker arm and
the camshaft (0.15mm) and/or the contact area
between the rocker arm and the valve (0.2mm).
3. Repeat the same operation on the other valves.
6.3.7 Checking clearance volume
1. Position the pistons at the top dead centre.
2. Measure the distance in four diametrically opposite
points on the piston crown.
3. Repeat
the
operation
The maximum value determines the measurement
(A).
Choose the gasket corresponding to the measured value.
This match determines the value of the clearance volume
(see "Table of head gasket and clearance volume values").
Table of head gasket and clearance volume
values
A (mm)
Number of holes
0,97÷1,06
0
1,07÷1,16
1
1,17÷1,25
2
54
OVERHAULS AND TUNING
on
all
pistons.
Clearance
volume
(mm)
0,39÷0,48
0,40÷0,48
Service Manual LDW FOCS 502 automotive _ cod. ED0053027270 - 3° ed_rev. 02
71
A
72
Advertisement
Table of Contents
