TOHATSU BFT250A - Page 404

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CYLINDER HEAD
ROCKER ARM SHAFT O.D.
Measure and record the rocker arm shaft O.D.
Replace the rocker arm shaft if its O.D. is smaller than
the service limit.
ROCKER ARM I.D.
Measure and record each rocker arm I.D.
Replace the rocker arms if their I.D. is larger than the
service limit.
Also check the rocker arm-to-cam contact surface for
any wear or scratches.
ROCKER ARM SHAFT-TO-ROCKER
ARM CLEARANCE
Subtract each rocker arm shaft O.D. from the
corresponding rocker arm I.D.
If the rocker arm shaft-to-rocker arm clearance exceeds
the service limit, replace the rocker arm and recheck.
If the rocker arm shaft-to-rocker arm clearance still
exceeds the service limit, replace the rocker arm shaft.
STANDARD:
IN/EX: 19.972 – 19.993 mm (0.7863 – 0.7871 in)
STANDARD:
IN: 20.019 – 20.039 mm (0.7881 – 0.7889 in)
EX: 20.019 – 20.049 mm (0.7881 – 0.7893 in)
STANDARD:
IN: 0.026 – 0.067 mm (0.0010 – 0.0026 in)
EX: 0.026 – 0.077 mm (0.0010 – 0.0030 in)
SERVICE LIMIT:
IN: 0.067 mm (0.0026 in)
EX: 0.077 mm (0.0030 in)