TOHATSU BFT 250A, Service Manual

Page: 441 / 639

15-27
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CYLINDER BLOCK
CRANKSHAFT/PISTON/CYLINDER
BLOCK INSPECTION
PISTON SKIRT O.D.
Measure and record the piston O.D. at a point 11.5 mm
(0.45 in) from the bottom, and 90° to the piston pin bore.
CYLINDER SLEEVE I.D.
Measure and record the cylinder I.D. at three levels in
both X and Y axis. Take the maximum reading to
determine the cylinder wear.
DIFFERENCE BETWEEN UPPER AND
LOWER PARTS OF SLEEVE I.D.
Measure and record the cylinder I.D. at three levels in
both X and Y axis. Take the difference between upper
and lower parts of sleeve I.D.
STANDARD:
88.974 – 88.984 mm (3.5029 – 3.5033 in)
SERVICE LIMIT:
88.964 mm (3.5025 in)
11.5 mm
(0.45 in)
90°
O.D.
11.5 mm
(0.45 in)
STANDARD:
89.000 – 89.015 mm (3.5039 – 3.5045 in)
SERVICE LIMIT:
89.065 mm (3.5065 in)
SERVICE LIMIT:
0.05 mm (0.002 in)
X
Y