PIAGGIO MP3 400 i.e., Service Manual, Page: 150 / 394

- If higher values than those prescribed are meas-
ured, replace the linings.
Check the size of the sealing ring opening:
Compression ring: 0.15 ÷ 0.35 mm. Max. value 0.5 mm
Oil scraper ring: 0.25 ÷ 0.50 mm. Max. value 0.65 mm
Oil scraper ring: 0.25 ÷ 0.50 mm. Max. value 0.65 mm
Rings/housing coupling clearances:
Carefully clean the sealing ring housings.
Place a thickness gauge between the ring and the
housing as shown in the drawing and check the
coupling clearances.
Top ring Standard coupling clearance:
0.01÷0.06 mm
Maximum clearances allowed after use: 0.10
mm
Intermediate ring Standard coupling clear-
ance: 0.02÷0.07 mm
Maximum clearances allowed after use: 0.10
mm
Oil scraper ring Standard coupling clearance:
0.01÷0.06 mm
Maximum clearances allowed after use: 0.10
mm
Replace the piston if clearances exceed the max-
imum limits specified in the table.
Removing the piston
- Install piston and wrist pin onto the connecting
rod, aligning the piston arrow the arrow facing to-
wards the exhaust.
Engine
MP3 400 i.e.
ENG - 58