ALTROZ SERVICE MANUAL

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1.2L REVOTRON ENGINE
58
I. Piston and Piston Rings :
1. Remove carbon deposits, if any, from the
piston.
2. Clean piston and piston rings using
appropriate cleansing agent.
NOTE
 The piston and piston rings can be reused if
the bore taper and sphericity is within the
specified limits.
 Carefully examine the piston rings for
cracks, scoring, ring groove/ clip groove
wear, piston pin bore wear.
 In case anyone piston is found to have any
one of the above defects, replace the
complete piston set.
3. Check for lateral clearance in piston ring
groove.
4. Check for butt clearance in cylinder bore.
5. Check for piston pin dimensions.
NOTE
 Butt clearance of piston ring is measured in
unworn portion of the cylinder bore.
 Piston and piston rings of appropriate size
should be used, if cylinder bores are re-
bored.
 If piston ring is found to be defective as
started above, then complete ring set should
be replaced.
Details Specification (mm)
Piston pin diameter 17.995/18.000
Piston pin length 46.7/47.0
Piston pin bore in
piston
18.003/18.008
Height of piston 43.8
Piston to bore
clearance
0.055/0.075
Piston and Cylinder Bore Sizes (REVOTRON
1.2L)
Type Grade
Cylinder
Bore Dia.
(mm)
Piston Dia.
(mm)
Standard
A 77.015/77.025 76.950/76.960
B 77.025/77.035 76.960/76.970
Piston Rings (REVOTRON 1.2L)
Type of ring
Ring
Thick
-ness
(mm)
Axial
Clearanc
e in
Piston
Groove
(mm)
Butt
Clearance
in Cylinder
Bore (mm)
1st
Compression
Ring
1.170/
1.190
0.06 / 0.1 0.17 / 0.32
2nd
Compression
Ring
1.47 /
1.49
0.05 /
0.09
0.4 / 0.6
3rd Oil Control
Ring
1.95 /
1.89
0.06 /
0.014
0.2 / 0.7