TOHATSU BFT250A Service Manual page 443

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PISTON RING END GAP
Measure the piston ring end gap 15 – 20 mm (0.6 – 0.8
in) from the cylinder bottom.
Before measurement, be sure to set the ring in the
cylinder squarely using the piston.
STANDARD:
TOP
SECOND
OIL
SERVICE LIMIT:
TOP
SECOND
OIL
If the measurement is too large, install a new piston ring
and measure again. Then, measure the cylinder sleeve
I.D. (page 15-27).
PISTON PIN BORE I.D.
Check the piston pin for damage.
Measure the piston pin bore I.D.
STANDARD:
21.960 – 21.963 mm (0.8646 – 0.8647 in)
PISTON PIN O.D.
Measure the piston pin O.D.
STANDARD:
21.961 – 21.965 mm (0.8646 – 0.8648 in)
SERVICE LIMIT:
21.954 mm (0.8643 in)
0.20 – 0.35 mm
(0.008 – 0.014 in)
0.40 – 0.55 mm
(0.016 – 0.022 in)
0.20 – 0.70 mm
(0.008 – 0.028 in)
0.6 mm (0.02 in)
0.7 mm (0.03 in)
0.8 mm (0.03 in)
CYLINDER BLOCK
PISTON
RING
END GAP
15 – 20 mm
(0.6 – 0.8 in)
15-29