Komatsu 4D98 Series Shop Manual page 66

4. Engine Body
(4) Servicing points
Point 7 Oil pan
Disassemble:
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Sealant is applied to the oil pan mount-
ing surface on the block. Carefully op-
erate so as not to damage or distort the
bonding surface.
Reassemble:
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Apply sealant (code No. 977770-
01212) before reassembly.
Point 2 Piston w/rod
Disassemble:
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Measure the connecting rod side gap.
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Standard 0.20 - 0.40 mm
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Carefully remove the carbon deposit on
side of the cylinder.
Connecting rod side gap
/
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top of the cylinder so as not to damage the inner
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Set the piston at the BDC position and remove the connecting rod cap. Then set the piston
at the TDC position, and push the connecting rod big end with the wooden shaft of a ham-
mer. Proceed carefully so as not to cause the cylinder block catch the rod big end. Set the
rod caps and crankpin metals in their correct combinations.
Reassemble:
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Apply oil especially carefully to the sliding contact surfaces of the pistons, rods and rings.
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Use the piston insertion tool (see 11 .l-9 in Chapter 11) to insert each piston w/rod in the
cylinder block and install the bearing metal cap.
Nm(kgf.m)
4TNE94.98
4TNE106 (T)
Standard (apply lube oil)
53.9-58.8 (5.5-6.0)
78.5-83.4 (8.0-8.5)
Point 3 Mdunting flange
Disassemble:
Place the engine on a stable base with the cylinder block upper surface facing down, and
remove the mounting flange carefully so as not to damage the combustion surface.
Reassemble:
Apply sealant (code No. 977770-01212) and install the mounting flange by matching the two
dowel pins. After assembly, raise the engine with its mounting flange on the bottom side.
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Unforeseen injury may arise due to falling of slipping when raising or reversing the
engine. Carefully operate so as not to lose balance.
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