ENGINE 3-37
PISTON TO CYLINDER CLEARANCE
Subtract the piston diameter from the cylinder bore diameter. If
the piston-to-cylinder clearance exceeds the service limit,
replace the cylinder or the piston, or both.
Piston to cylinder clearance
Service Limit: 0.120 mm (0.0047 in)
PISTON PIN AND PIN BORE
Measure the piston pin bore diameter using the small bore
gauge.
If the measurement is out of specification, replace the piston.
Piston pin bore I.D.
Service Limit: 18.030 mm (0.7098 in)
09900-20602: Dial gauge
09900-22403: Small bore gauge (18 – 35 mm)
Measure the piston pin outside diameter at three positions using
the micrometer.
If any of the measurements is out of specification, replace the
piston pin.
Piston pin O.D.
Service Limit: 17.980 mm (0.7079 in)
09900-20205: Micrometer (0 – 25 mm)
PISTON RING GROOVE CLEARANCE
Measure the side clearance of the 1st and 2nd rings using the
thickness gauge. If any of the clearances exceed the limit,
replace both the piston and piston rings.
Piston ring to groove clearance
Service Limit (1st): 0.180 mm (0.0071 in)
(2nd): 0.150 mm (0.0059 in)
Piston ring groove width
Standard (1st): 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(2nd): 1.21 – 1.23 mm (0.0476 – 0.0484 in)
(Oil): 2.51 – 2.53 mm (0.0988 – 0.0996 in)
Piston ring thickness
Standard (1st): 0.975 – 0.990 mm (0.0384 – 0.0390 in)
(2nd): 1.170 – 1.190 mm (0.0461 – 0.0469 in)
09900-20205: Micrometer (0 – 25 mm)
09900-20803: Thickness gauge
NOTE:
Remove any carbon from the piston crown and ring grooves
using a soft-metal scraper.
Содержание TU250X
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