Stiga WBE170 - Page 50

Release 00 - 11/2018
page 50
Engine WBE 170
Workshop Manual
16. ENGINE BLOCK - Overhauling internal parts
17 - On the engine shaft (23), removed beforehand,
use a digital gauge to check the diameter of the
connecting rod pin.
The value must not be less than 25,92 mm or the
engine shaft will have to be replaced.
NOTE - In the case of seizing, the manifolds
canbepolishedwithneemerycloth,only
removing foreign matter and checking that
thenalsizeremainswithintheaforementio-
ned limit.
18 - To check the alignment between the mani-
folds and the protruding part of the shaft, place
the engine shaft on two prismatic guides (30) and,
with the help of a comparator (31) 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!
19 - To ret the rings to the piston, rst t the three
oil scraper rings (32), then the ring with a round
edge (33) and nally the ring with a sharp edge
(34), being careful over the markings (which must
face the piston head) and in arranging the gaps to
ensure that they are not aligned with each other;
34
33
32
10
20
30
40
50
60
70
80
90
23
31
30
30
D
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