Komatsu 4D98 Series Shop Manual page 71

4. Engine Body
@ Crankpin and journal measurement
Measure the outside diameter, round-
ness and taper at each crankpin and
journal.
Correct by grinding if unevenly wear,
roundness exceeding the limit or insuf-
ficient outside diameter is found. Re-
place if the defect is excessive.
l
Crankpin
(mm)
If the oil clearance exceeds the limit,
use an undersized bearing.
Crank&n
Measuring position of the crankpin
and crank journal
l
Undersized bearing (0.25
mm)
Code
No.
Standard thickness
(mm)
4TNE94.98
129900-23350
1.617-l .625
4TNE106
(T) 123900-23350
2.109-2.117
l
Pin machining dimension
Pin machining dimension (mm)
l
Crank journal
(mm)
If the clearance limit is exceeded, use an
undersized bearing.
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