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7. CYLINDER/PISTON GRAND DINK 125/150
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: 57.90mm replace if below
SH30DA 57.30mm replace if below
SH25DA 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: 58.10mm repair or replace if
below
SH30DA 57.50mm repair or replace if over
SH25DA 52.50mm repair or replace if over
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 Top
values measured at the three levels) is subject
to the maximum value calculated.
Service Limits: Middle
True Roundness: 0.05mm repair or replace
if over Bottom
Cylindricity: 0.05mm repair or replace if over
7-5