Komatsu 4D98 Series Shop Manual page 69

4. Engine Body
Point 7 Oil seal
Reassemble:
l
Replace the oil seal with a new one whenever disassembled. Apply lithium grease at the
time of assembly.
(5) Parts inspection and measurement
(5.1) Cylinder block
Especially clean head surface, cylinder bores and oil holes, and check after removing any
carbon deposit and bonding agent.
Appearance inspection
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.
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:
Maximum value of the difference
between the measured values in
the same cross section.
Cylindricity:
Maximum value of the difference
between the measured values in
the same direction.
Cylinder
Cylinder
bore measurement positions
Standard Limit
Cylinder inside 4TNE94 94.000-94.030 94.130
diameter mm 4TNE98 98.000-98.030 98.130
4TNEi 06 (T)
106.000-l 06.030 106.130
Cylinder bore Roundness mm 0.01 or less
0.03
Cylindricity mm
4-21