Komatsu 4D98 Series Shop Manual page 67

4. Engine Body
Point 4 Journal bearing cap
Disassemble:
. Before removing the journal bearing,
measure the crankshaft side gap.
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Crankshaft side gap
Reassemble:
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If the side gap exceeds the standard, replace the thrust metal with an
oversiie one.
0.25 DS Thrust metal Standard thickness (mm)
Upper
Lower
4TNE94.98 129900-02370 129900-02360 2.055-2.105
4TNE106 (T) 123900-02370 123900-02360 2.555-2.605
Disassemble:
Thrust metals
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Remove the bearing caps, cap side
bearings, and thrust metals. Place
each
thrust metal with identification of
the position and direction.
Block side main
bearing metals
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Carefully install each thrust metal so
that the grooved one is positioned
away from the cap.
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Do not confuse the upper and lower
main bearing metals. The upper main
bearing metal (block side) has an oil
hole, and the lower one does not. The
"wheel and arrow" marks on the cap
shall face the flywheel.
Nm (kgf*m)
Standard (apply lube oil)
4TNE94*98
107.9-117.7 (11-12)
1 4TNE106 (T) 1 186.3-205.9 (19-21)
Point 5 Crankshaft
Disassemble:
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Remove the crankshaft. Remove each main bearing metal upper (block side) and pair it with
the metal cap side lower metal.
Carefully prevent damage to the bearing or finger injury when removing the crank-
shaft because it is heavy-
4-19