- 37 -
9LD Workshop Manual _ cod. 1.5302.286 - 3° ed_rev. 02
4
47 48
45 46
A*39.49÷29.49**10.59÷00.59
90.0÷70.0
B*49.49÷39.49**20.59÷10.59
C*59.49÷49.49**30.59÷20.59
Disassembly / Reassembly
Measure diameter size between two diametrically opposed points at three
different heights.
 As per the cylinder sizes, see Table “Piston and cylinder types and
sizes".
*In case of diameter wear above 0.05 mm replace piston and piston rings.
** In case wear exceeds 0.10 mm, bore the cylinder and fit oversize piston and rings.
In case of less wear replace piston rings only.
Note: Oversize pistons of 0.5 and 1 .0 mm are available (only for standard and 97/68 CE engines).
Important
The cylinder heads must be tightened with the exhaust or intake manifold mounted to keep them lined up.
The cylinder and piston must be replaced with a new cylinder and piston of the same class.
PISTON
Remove circlips and remove piston pin.
Remove piston rings and clean grooves.
Measure diameter at 17 mm from the bottom of skirt.
Table “Piston and cylinder types and sizes"
Clearance (mm)
Ø Cylinder (mm)Ø Piston (mm)
Class
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