ENGINE AND PERIPHERALS
Foreword
10
USE OF THE MANUAL
In this manual you will find three major chapters:
- specifications,
- removal of en
gine,
- reassembl
y of engine.
To repair a component on the vehicle refer to the
Workshop Repair Manual and Technical Notes.
UNITS OF MEASUREMENT
- All the dimensions are expressed in millimetres,
mm (unless otherwise indicated).
The tightening torques:
- in decaNewton metres daN.m
(reminder:
1 daN.m = 1.02 m.kg).
The tightening torques without tolerances
must be kept within
±10°.
- in degrees, the tightening torques without to-
lerances must be kept within
±3 %.
The pressures are in
bars.
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ENGINE AND PERIPHERALS
En
gine repair10
80437R ENGINE REFITTING
Clean the cylinder block, particularly the liner
supporting surface inside it.
Pre
paration of the "pistons-liners" assembly
The parts supplied in the set are matched.
Mark all the parts from A to D in order to retain
the matching.
Dissolve the rustproofing film completely.
Never scratch the
parts.
CYLINDER LINER PROTRUSION
These engines are equipped with liner base O-
rings.
The O-rings are only provided for sealing
purposes.
The liner rests directly on the cylinder block and
their protrusion (X) depends on thei
r
manufacturing dimensions.
75615R5
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ENGINE AND PERIPHERALS
En
gine repair10
The amount of protrusion (X) must be checked as
follows:
- place the cylinder liner,
without its O-ring (J), in
the cylinder block,
- check the protrusion with tools
Mot. 251-01
and
Mot. 252-01.
The protrusion (X) should be between
0.02 and
0.09 mm.
Position the liners so that:
- the difference in protrusion between two adja-
cent liners does not exceed
0.05 mm (within the
tolerance),
- the amount of protrusion reduces from cylin-
der No.
1 to cylinder No.
4 or vice-versa.
85404R1
92278S
When the correct protrusion has been obtained,
re-form assemblies
A, B, C and D, then number the
liners, the pistons and the gudgeon pins from
1 to
4 (No.1 on the flywheel side) in order to match up
with the corresponding connecting rod.
If the protrusion is incorrect, check with a set of
new liners in order to find out whether the faul
t
lies in the cylinder block or in the liners; other-
wise, check the theoretical dimensions (see
"Specifications" section).
FITTING THE GUDGEON PINS
The gudgeon pins are press fitted on the
connecting rods and are fully floating in the
pistons. Use tool
Mot. 574-2 supplied in a kit
containing:
- a piston support base (S),
- an extraction mandrel (M),
- piston support rings (B),
- mounting pins (A) with their centring devices
(C).
76554R2
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