3-38 ENGINE
PISTON RING FREE END GAP AND PISTON RING END GAP
Measure the piston ring free end gap using a vernier calipers.
Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using a thickness gauge.
If the piston ring’s end gap is out of specification, replace the
piston ring.
Piston ring free end gap
Service Limit (1st): 8.0 mm (0.31 in)
(2nd): 8.8 mm (0.35 in)
09900-20101: Venier calipers (150 mm)
Piston ring end gap
Service Limit (1st): 0.5 mm (0.020 in)
(2nd): 0.7 mm (0.028 in)
09900-20803: Thickness gauge
CONROD AND CRANKSHAFT
CONROD SMALL END I.D.
Measure the conrod small end inside diameter using the dial cal-
ipers. If the conrod small end inside diameter exceeds the ser-
vice limit, replace the conrod.
Conrod small end I.D.
Service Limit: 18.040 mm (0.7102 in)
09900-20605: Dial calipers (10 – 34 mm)
CONROD DEFLECTION
Move the small end sideways while holding the big end immov-
able in thrust direction. Measure the amount of deflection.
Turn the conrod and see if it moves smoothly without play and
noise. This method can check the extent of wear on the parts of
the conrod’s big end.
Conrod deflection
Service Limit: 3.0 mm (0.12 in)
09900-20607: Dial gauge
09900-20701: Dial gauge chuck
09900-21304: V blocks
Содержание TU250X
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