Inspecting The Piston Rings - PIAGGIO Liberty 125 Workshop Manual

Liberty 125 - 200 4tempi

Inspecting the piston rings

- Alternately insert the three sealing rings into the cylinder, in the area where it retains its original di-
ameter. Using the piston, insert the rings perpendicularly to the cylinder axis.
- Measure the opening, see figure, of the sealing rings using a thickness gauge.
- If any measurements are greater than specified, replace the piston rings.
N.B.
BEFORE REPLACING ONLY THE PISTON RINGS, ENSURE THAT THE CLEARANCE BETWEEN
THE PISTON RINGS AND THE PISTON RING GROOVES, AND BETWEEN THE PISTON AND THE
CYLINDER, IS AS SPECIFIED. IN ANY CASE, NEW PISTON RINGS USED IN COMBINATION WITH
A USED CYLINDER MAY HAVE DIFFERENT BEDDING CONDITIONS THAN THE STANDARD.
Name
Compression ring
Oil scraper ring
Oil scraper ring
Compression ring 1st
oversize
Oil scraper ring 1st
oversize
Oil scraper ring 1st
oversize
Compression ring 2nd
oversize
Oil scraper ring 2nd
oversize
Oil scraper ring 2nd
oversize
Compression ring 3rd
oversize
Oil scraper ring 3rd
oversize
Oil scraper ring 3rd
oversize
Maximum clearance after use: 1 mm
Name
Top piston ring
Middle piston ring
Oil scraper
Name
Compression ring
Oil scraper ring
Oil scraper ring
Name
Top piston ring
Middle piston ring
oil scraper
SEALING RINGS (125)
Description Dimensions
57 x 1
57x1
57x2.5
57.2 x 1
57.2x1
57.2x2.5
57.4x1
57.4x1
57.4x2.5
57.6x1
57.6x1
57.6x2.5
MAX. VALUE (125)
Description Dimensions
SEALING RINGS (200)
Description Dimensions
72x1.5
72x1
72x2.5
MAX. VALUE (200)
Description Dimensions
Initials
A
A
A
A
A
A
A
A
A
A
A
A
Initials
0,40
0,40
0,45
Initials
A
A
A
Initials
0,40
0,50
0,50
Engine
Quantity
0.15 ÷ 0.30
0.10 ÷ 0.30
0.10 ÷ 0.35
0.15 ÷ 0.30
0.10 ÷ 0.30
0.10 ÷ 0.35
0.15 ÷ 0.30
0.10 ÷ 0.30
0.10 ÷ 0.35
0.15 ÷ 0.30
0.10 ÷ 0.30
0.10 ÷ 0.35
Quantity
Quantity
0.15 ÷ 0.30
0.20 ÷ 0.40
0.20 ÷ 0.40
Quantity
ENG - 95