Nissan Terrano r20e. Instruction — part 307
Removal and Installation
Turbocharger should not be disassembled.
1. Drain engine coolant.
2. Remove the following:
I
Air duct and intercooler components
I
Heat shield plates
I
Exhaust front tube
I
Oil tubes
I
Water tubes
3. Remove turbocharger from exhaust manifold.
4. Remove turbocharger bracket bolts.
Inspection
Condition 1: Low engine power
Probable cause
Corrective action
Air leak at the connection of compressor housing and suc-
tion hose/inlet tube, or inlet and intake manifold.
E
Correct the connection.
Exhaust gas leak at the connection of turbine housing and
exhaust manifold, connecting tube or exhaust outlet.
E
Correct the connection or replace gasket.
By-pass valve is stuck in open position.
E
Replace turbocharger assembly.
Stuck or worn journal or bearing.
E
Broken shaft.
E
Sludge on back of turbine wheel.
E
Broken turbine wheel.
E
Condition 2: Excessively high engine power
Probable cause
Corrective action
Disconnected or cracked rubber hose of by-pass valve
controller.
E
Correct or replace rubber hose.
By-pass valve is stuck in closed position.
E
Replace turbocharger assembly.
Controller diaphragm is broken.
E
TURBOCHARGER
TD27Ti
EM-119
Condition 3: Excessively high oil consumption, or exhaust shows pale blue smoke
Probable cause
Corrective action
Oil leak at the connection of lubricating oil passage.
E
Correct the connection.
Oil leak at oil seal of turbine.
E
Replace turbocharger assembly.
Oil leak at oil seal of compressor.
E
Worn journal or bearing.
E
Perform the following checks. If NG, replace turbocharger unit.
OIL AND WATER TUBES
Check tubes for clogging.
NEM180
SEM029F
TURBOCHARGER
TD27Ti
Inspection (Cont’d)
EM-120
ROTOR SHAFT
1. Check rotor shaft for smooth rotation.
2. Check rotor shaft for carbon deposits.
3. Measure rotor shaft runout.
Runout (Total indicator reading):
Standard
0.056 - 0.127 mm (0.0022 - 0.0050 in)
4. Measure rotor shaft end play.
End play:
Standard
0.013 - 0.097 mm (0.0005 - 0.0038 in)
I
Do not allow wheels to turn when axial play is being mea-
sured.
SEM030F
SEM031F
SEM032F
SEM827D
TURBOCHARGER
TD27Ti
Inspection (Cont’d)
EM-121
TURBINE WHEEL
Check turbine wheel for the following.
I
Oil
I
Carbon deposits
I
Deformed fins
I
Contact with turbine housing
COMPRESSOR WHEEL
Check compressor wheel for the following.
I
Oil
I
Deformed fins
I
Contact with compressor housing
WASTEGATE VALVE
Remove rod pin and check wastegate valve for cracks, deformation
and smooth movement. Check valve seat surface for smoothness.
Check operation of by-pass valve controller.
I
Move by-pass valve to make sure that it is not sticking or
scratched.
I
Measure rod end play of the by-pass valve controller.
Do not apply more than 102.6 kPa (1,026 mbar, 770 mmHg,
30.31 inHg) pressure to controller diaphragm.
By-pass valve controller stroke/pressure:
0.38 mm (0.015 in)/92 kPa (920 mbar, 690 mmHg,
27.17 inHg)
SEM828D
SEM829D
SEM830D
SEC727B
TURBOCHARGER
TD27Ti
Inspection (Cont’d)
EM-122
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