TOHATSU BFT250A Service Manual page 444

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CYLINDER BLOCK
PISTON PIN-TO-PIN BORE
CLEARANCE
Set the cylinder gauge at the piston pin O.D., and set
the gauge needle at zero "0".
Set the cylinder gauge in the piston pin hole, and
measure the piston pin-to-pin bore clearance.
STANDARD:
–0.005 – +0.002 mm (–0.0002 – +0.0001 in)
SERVICE LIMIT:
0.004 mm (0.0002 in)
CONNECTING ROD SMALL END I.D.
Measure the connecting rod small end I.D.
STANDARD:
21.970 – 21.976 mm (0.8650 – 0.8652 in)
CONNECTING ROD SMALL END-TO-
PISTON PIN CLEARANCE
Subtract each piston pin O.D. from the corresponding
connecting rod small end I.D.
STANDARD:
0.005 – 0.015 mm (0.0002 – 0.0006 in)
SERVICE LIMIT:
0.019 mm (0.0007 in)
CONNECTING ROD BIG END AXIAL
CLEARANCE
Measure the connecting rod big end axial clearance.
STANDARD:
0.15 – 0.35 mm (0.006 – 0.014 in)
SERVICE LIMIT:
0.45 mm (0.018 in)
If the clearance exceeds the service limit, replace the
connecting rod and connecting rod cap with new ones
as a set, and recheck.
If the measurement still exceeds the service limit,
replace the crankshaft with a new one.
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