Komatsu 4D98 Series Shop Manual page 112

8. Turbocharger (for 4TNE108TI
(2.7)
Compressor housing installation
@ Apply liquid gasket (Three Bond No. 1207) on the compressor side flange of bearing
housing 15.
Note) See
section
(2.4) @
for the portion to be applied.
Applying thickness
: 0.1 to
0.2
mm
@ Install compressor side keep plate 10, and tighten M8 hexagon bolt 8.
Tightening torque
:
48S
kgf-cm (4.7fl.5 N-m)
(2.8) Rotor play measurement
See the inspection procedure in section 8.3 (2.2) for the measurement method.
If the rotor play does not satisfy the standard, reassembly is necessary since assembly error or
use of a wrong part is conceivable.
@ Rotor play in axial direction
Service standard
:
0.63
to 0.06 mm
@ Rotor play in radial direction
Service standard
:
0.08
to 0.13 mm
8.7 Handling after Disassembly and Reassembly
When installing the turbocharger on the engine or handling the turbocharger after installation, strictly
observe the instructions given below.
Especially pay careful attention for preventing foreign matter entrance into the turbocharger.
(1) Instructions for turbocharger installation
<Lubrication system>
@ Pour new lubricating oil through the oil filler port before installation on the engine, and
manually turn the turbine shaft to lubricate the floating and thrust bearings.
@ Flush the oil inlet pipe from the engine and outlet pipe, and check no crushed pipe nor dirt
or foreign matter remaining in the pipes.
@ Connect the pipes securely so as to ensure no oil leak from joints.
<Intake system>
@ Check no foreign matter or dirt in the intake line.
@ Connect securely to prevent any air leak from joints with the intake duct and air cleaner.
<Exhaust system>
@ Check no dirt or foreign matter in the exhaust system.
@ Since heat resistant steel is used for the bolts and nuts, do not use general bolts and nuts
for installation. Always apply anti-seizure agent on fastening bolts and nuts to be tight-
ened.
(Use heat-resistant hexagon bolts for the turbine housing.)
@ Connect exhaust &oes securely to prevent gas leak from each pipe joint.
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