Parts Inspection And Measurement - Takeuchi TB 175 Handbuch

4.4.5 Parts inspection and measurement

(1) Cylinder block
Especially clean head surface, cylinder bores and oil
holes, and check after removing any carbon deposit and
bonding agent.
Appearance inspection
(a)
Check if there is any discoloration or crack. If crack is
suspected, perform color check. Sufficiently clean the oil
holes and check they are not clogged.
(b)Cylinder bore and distortion
Measure at 20 mm below the crest of the liner, at 20 mm
from the bottom end and at the center.
Roundness:
Roundness is found as follows though it is the simple
method. Measure cylinder diameters of the A direction
and the B direction on each section of a, b and c.
Roundness is the maximum value among those
difference values.
Cylindricity:
Cylindricity is found as follows though it is the simple
method.
Measure cylinder diameters of a, b and c sections in
the A direction, and calculate the difference in
maximum value and minimum value of the measured
diameters.
In the same way measure and calculate the difference
in the B direction.
Cylindricity is the maximum value between those
difference values.
Item
Cylinder inside diameter
Roundness
Cylinder bore
Cylindricity
4. Disassembly, inspection and reassembly of engines
Model Standard
3TNV82A 82.000 to 82.030
TNV84 84.000 to 84.030
TNV88 88.000 to 88.030
4TNV94L 94.000 to 94.030
4TNV98 98.000 to 98.030
4TNV106(T) 106.000 to 106.030
all TNV 0.01 or less
95
Cylinder bore
20mm
a
b
Measure in two directions
c
A and B at points a,b and c.
20mm
Cylinder bore measurement positions
Limit
82.200
84.200
88.200
94.130
98.130
106.130
0.03
A
B
mm