Release 00 - 03/2018
Engine TRE 224
page 49
Workshop Manual
15. ENGINE BLOCK - Overhauling internal parts
16 - To check the alignment between the mani-
folds and the protruding part of the shaft, place
the engine shaft on two prismatic guides (28) and,
with the help of a comparator (29) placed at the
end, check the displacement by rotating the shaft.
The shaft must be replaced if the displacement
exceeds 0.10 mm.
IMPORTANT: A bent shaft must never be re-
paired!
WARNING - DANGER: A bent shaft causes ab-
normal vibrations and could be dangerous
when the machine is used!
17 - To reassemble the segments on the piston per-
form sequentially:
- Mount the oil wiper (30), composed of three
rings;
- Assemble the rounded edge segment (31) with
the rounded edge facing downwards;
- Assemble the live edge segment (32).
NOTE: The two segments (31) and (32) must
be oriented with the lights not aligned betwe-
en them.
18 - Fit the connecting rod (17), the gudgeon pin
(26) and clamping rings (25) to the piston (19), ta-
king care over the connecting rod marking, which
must be pointing towards the engine shaft exit.
Piston marking must point towards the exhaust.
19 - Put the piston into the ring compression tool (33).
30
31
32
26
25
19
25
17
10
20
30
40
50
60
70
80
90
29
28
28
33
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