TIAGO

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1.05L REVOTORQ ENGINE
62
K. 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.
Details Specification (mm)
Piston pin diameter 27 -0.005
Piston pin length 62 -0.3
Piston pin bore in piston 27-0.013/-0.007
Height of piston 67
Piston to bore clearance 0.06 - 0.08
Maximum permissible
difference in weights of
piston with pin and rings
1.5 gms
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.
Piston and Cylinder Bore Sizes
Type Grade Cylinder Bore Dia. (mm) Piston Dia. (mm)
Standard
A 75.00 / 75.009 74.93 / 74.939
B 75.01 / 75.019 74.94 / 74.949
C 75.02 / 75.03 74.95 / 74.96
Piston Rings
Type of ring Ring Thickness (mm)
Axial Clearance in
Piston Groove (mm)
Butt Clearance in
Cylinder Bore (mm)
1st Compression Ring 2.5 (Nominal) ---------- 0.25 / 0.45
2nd Compression Ring 1.99 / 1.97 0.08 / 0.04 0.4 / 0.6
3rd Oil Control Ring 2.99 / 2.97 0.03 / 0.07 0.25 / 0.45