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D
E
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AILY
URO
Measuring piston diameter
Figure 128
Use a micrometer (2) to measure plunger (1) diameter, in
order to determine the assembling play. The diameter shall
be measured at such a distance from the plunger base as
shown in the figure.
NOTE
The pistons are supplied as spare parts with the
standard, normal and 0.4mm oversize diameters
together with rings, pin and retaining rings.
Figure 129
The clearance between the piston and cylinder liner can also
be checked using a feeler gauge (1) as illustrated in the figure.
540841
Piston pins
Figure 130
Measuring the diameter of the piston pin (1) with a
micrometer (2).
Print 603.93.651
Conditions for correct pin-piston coupling
Figure 131
108195
Lubricate the pin (1) and its seat on the hubs of the piston
(2) with engine oil. The pin must go into the piston by lightly
pressing with the fingers and must not drop out by gravity.
540842
Piston rings
Figure 132
75395
The trapezoidal split rings (1
nd
(2
slot) have the word TOP etched in them; when fitting
them on the piston, the word TOP must be facing upwards.
Figure 133
1
2
18857
Check the thickness of the piston rings (2) with a micrometer
(1).
F1A ENGINE
st
slot) and the oil scraper rings
Base - March 2006
87
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