Inspection Of Engine Parts - TOHATSU MX 50D2 Service Manual

Power Unit
D2
D4
D6
a 10mm (0.39 in)
b 30mm (1.18 in)
c 80mm (3.15 in)
5-60
D1
a
b
D3
c
D5
d
e
d Crank Shaft Direction
e Crank Web Direction

17) Inspection of Engine Parts

1. 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
68.00 mm (2.677 in)
Oversize Piston :
68.50 mm (2.697 in)
Functional Limit :
68.06 mm (2.68 in)
Oversize Piston :
68.56 mm (2.699 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.
GB
) at a, b and c.
- D
1 6
- D ) : Standard Value
1 6
2st X50D2 2011