TOHATSU BFT250A Service Manual page 442

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CYLINDER BLOCK
PISTON-TO-CYLINDER CLEARANCE
Subtract each piston skirt O.D. from the corresponding
cylinder sleeve I.D.
STANDARD:
0.016 – 0.041 mm (0.0006 – 0.0016 in)
SERVICE LIMIT:
0.080 mm (0.0032 in)
PISTON RING THICKNESS
Check the piston ring and oil ring for damage.
Always replace the oil ring spacer and side rails as a
set.
Measure the piston ring thickness.
STANDARD:
TOP
SECOND
PISTON RING GROOVE WIDTH
Measure the piston ring groove width.
STANDARD:
TOP/SECOND 1.220 – 1.230 mm
OIL
SERVICE LIMIT:
TOP/SECOND 1.25 mm (0.049 in)
OIL
PISTON RING SIDE CLEARANCE
Measure the piston ring side clearance.
STANDARD:
TOP
SECOND
SERVICE LIMIT:
TOP/SECOND 0.13 mm (0.005 in)
15-28
1.170 – 1.185 mm
(0.0461 – 0.0467 in)
1.175 – 1.190 mm
(0.0463 – 0.0469 in)
(0.0480 – 0.0484 in)
2.805 – 2.825 mm
(0.1104 – 0.1112 in)
2.85 mm (0.112 in)
0.035 – 0.060 mm
(0.0014 – 0.0024 in)
0.030 – 0.055 mm
(0.0012 – 0.0022 in)
TOP
SECOND
OIL