Daihatsu F300 Service Manual page 1265

ENGINE MECHANICALS
(2) Calculation of piston-to-cylinder bore clearance
Subtract the measured piston outer diameter from the
measured cyllnder bore diameter.
Ensure that this piston-to-cylinder bore clearance is less
than 0.11 mm.
P'1sto1-to-cyflnder bore clearance
Specified Value: 0.025- 0.045 mm
Allowable Limtt: 0.11 mm
If the piston-to-cylinder bore clearance exceeds the
allowable limit, perform boring and honing the cylinder
bores so that the cylinder bore diameter may match with
the oversized piston.
3. Measurement of piston ring groove width
Measure the groove width of the piston rings No. 1, No. 2
and No.3 with a thickness gauge.
Specified Value:
No. 1 piston ring groove width 1.202 - 1.204
mm
No. 2 piston ring groove width
1.501 - 1.503 mm
No. 3 piston ring groove width
3.01 - 3.03
mm
4. Measurement of p"1ston pin bore diameter of piston
Measure the· piston pin bore diameter at the two points as
shown in the right figure, using a dial gauge for bore diameter
measurement. Record the minimum measured value as the
piston pin bore diameter.
Specified Value: 18.999- 19.005 mm
INSPECTION OF PISTON PIN
1. Visually inspect the piston pin for damage or scratches.
Replace the piston pin, as required.
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