TOHATSU MD 30B2 Service Manual page 160

Power Unit
3. Replace crank shaft ass'y if the deflection is over the
standard value.
Connecting Rod Deflection Limit :
2.0 mm (0.08 in)
28) Inspection of Cylinder
1. Measure cylinder inner diameters (D
If any of the diameter is over the limit, replace the cylinder or
bore the liner to make it compatible with an oversize piston.
Cylinder Inner Diameters (D
68.05 mm (2.6791 in)
Oversize Piston :
68.55 mm (2.6988 in)
Functional Limit :
68.11 mm (2.6815 in)
• Measure at the area of the largest wear.
• The measurement heights b and c represent
location 5 mm above and below exhaust port. d
represents diameter in crank shaft direction, e
represents the one in crank web direction.
• Replace the cylinder in any of the following
cases; the piston sliding surface is severely
damaged such as deeply scratched or scuffed
so that it cannot be repaired with water-proof
sand paper of #400 – 600, or the difference of
liner inner diameter between the largest worn
area and minimum worn area is 0.06mm (0.0024
in) or over.
5-38
- D ) at a, b and c.
1 6
- D ) : Standard Value
1 6
D2
D4
D6
a 10mm (0 39 in)
b 30mm (1 18 in)
c 80mm (3 15 in)
D1
a
b
D3
c
D5
d
e
d Crank Shaft Direction
e Crank Web Direction
TLD D30/40/50B2 2013