quannon 125 Workshop-manual : Page 72

          7. CYLINDER/PISTON                                         QUANNON 125


 Measure the piston pin O.D.
 Service Limit: 14.96mm replace if below




 Measure the piston O.D.
 · Take measurement at 9mm from the
      bottom and 90° to the piston pin hole.
 Service Limit: 52.30mm replace if below
 Measure the piston-to-piston pin clearance.
 Service Limit: 0.02mm replace if over




 CYLINDER INSPECTION
 Inspect the cylinder bore for wear or damage.
 Measure the cylinder I.D. at three levels of
 top, middle and bottom at 90° to the piston
 pin (in both X and Y directions).
 Service Limit:
 52.50mm repair or replace if below

 Measure the cylinder-to-piston clearance.
 Service Limit:
 0.1mm repair or replace if over


 The true roundness is the difference between
 the values measured in X and Y directions.
 The cylindricity (difference between the
 values measured at the three levels) is           IN         EX
 subject to the maximum value calculated.           Top
 Service Limits:
 True Roundness:                                  Middle
 0.05mm repair or replace if over
 Cylindricity: 0.05mm repair or replace if over
                                                  Bottom




7-5