1986 TOYOTA SUPRA Service Repair Manual

(b) Remove the 2 nuts, and disconnect the turbo oil pipe from
turbocharger. Remove the gasket.
INSTALLATION HINT:
wUse a new gasket.
wAlign the oil holes of the gasket and turbocharger
housing.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(c) Disconnect the turbo oil hose from the turbo oil outlet on the
No.1 oil pan, and remove the turbo oil pipe.
29. REMOVE TURBOCHARGERS AND TURBINE OUTLET
ELBOW ASSEMBLY
(a) Disconnect these hoses:
(1) Heater hose (from No.3 water bypass pipe) from No.2
water bypass pipe
(2) Water bypass hose (from No.2 turbo water pipe) from
No.2 water bypass pipe
(b) Remove the 8 nuts holding the turbochargers to the exhaust
manifold.
INSTALLATION HINT:
wUse 8 new nuts.
wUniformly tighten the nuts in several passes.
Torque: 54 NVm (550 kgfVcm, 40 ftVlbf)
(c) Remove the 2 turbochargers and turbine outlet elbow
assembly.
(d) Remove the 2 gaskets.
INSTALLATION HINT: Use 2 new gaskets.
30. R E M O V E N O . 1 VACUUM PIPE FROM NO.2
TURBOCHARGER
Disconnect the 2 air hoses from the actuator for the exhaust
bypass valve, and remove the vacuum pipe.
31. REMOVE NO.2 AIR TUBE AND NO.3 WATER BYPASS
PIPE ASSEMBLY FROM NO.2 TURBOCHARGER
Remove the 2 bolts, the air tube, bypass pipe assembly and
gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
EG±156± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

32. REMOVE EXHAUST MANIFOLD PLATE FROM TURBINE
OUTLET ELBOW
Remove the 2 bolts and manifold plate.
33. R E M O V E N O . 2 TURBO WATER PIPE FROM NO.2
TURBOCHARGER
Remove the 2 nuts, water pipe and gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
34. REMOVE BEARING HOUSING SIDE PLATE FROM NO.1
TURBOCHARGER
Remove the 2 nuts, housing plate and gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
35. R E M O V E N O . 1 TURBO WATER PIPE FROM NO.1
TURBOCHARGER
Remove the 2 nuts, water pipe and gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
36. REMOVE BEARING HOUSING SIDE PLATE FROM NO.2
TURBOCHARGER
Remove the 2 nuts, housing plate and gasket.
INSTALLATION HINT: Use a new gasket.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
37. R E M O V E N O . 1 TURBOCHARGER FROM TURBINE
OUTLET ELBOW
Remove the 6 nuts, turbocharger and gasket.
INSTALLATION HINT:
wUse a new gasket and 6 new nuts.
wUniformly tighten the nuts in several passes.
Torque: 25 NVm (250 kgfVcm, 18 ftVlbf)
38. R E M O V E N O . 2 TURBOCHARGER FROM TURBINE
OUTLET ELBOW
Remove the 6 nuts, turbocharger and gasket.
INSTALLATION HINT:
wUse a new gasket and 6 new nuts.
wUniformly tighten the nuts in several passes.
Torque: 25 NVm (250 kgfVcm, 18 ftVlbf)
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±157

TURBOCHARGER COMPONENTS
INSPECTION
Turbochargers
1. INSPECT TURBINE SHAFT ROTATION
Grasp the edge of the turbine wheel and turn it. Check that
the impeller wheel turns smoothly.
If the impeller wheel does not turn or if it turns with a drag, re-
place the turbocharger assembly.
2. INSPECT AXIAL PLAY OF TURBINE SHAFT
(a) Using a dial indicator, insert the needle of the dial indicator
into the air tube side.
(b) Move the turbine shaft in an axial direction, measure the axial
play of the turbine shaft.
Maximum axial play:
0.110 mm (0.0045 in.)
If the axial play is greater than maximum, replace the turbo-
charger assembly.
3. INSPECT RADIAL PLAY OF TURBINE SHAFT
(a) Using a dial indicator, insert the needle of the dial indicator
into the oil outlet hole and set it in the center of the turbine
shaft.
(b) Move the turbine shaft in a radial direction, measure the
radial play of the turbine shaft.
Maximum radial play:
0.162 mm (0.0064 in.)
If the axial play is greater than maximum, replace the turbo-
charger assembly.
4. INSPECT WASTE GATE VALVE OPERATION
(a) Disconnect the actuator air hose from the housing, and plug
the hose end.
(b) Using SST, apply approx. 120 kPa (1.22 kgf/cm
2, 17.4 psi) of
pressure to the actuator.
SST 09992±00241
(c) Move the actuator push rod, and check that the waste gate
valve is open.
If operation is not as specified, replace the No.1 turbocharger
assembly.
NOTICE: Never apply more than 187 kPa (1.91 kgf/cm2, 27.2
psi) of pressure to the actuator.
(d) Reconnect the actuator air hose to the housing. EG±158
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

5. INSPECT EXHAUST BYPASS VALVE OPERATION
(a) Plug one side of the actuator air hose end.
(b) Using SST, apply approx. 98 kPa (1.00 kgf/cm
2, 14.2 psi) of
pressure to the actuator.
SST 09992±00241
(c) Move the actuator push rod, and check that the exhaust
bypass valve is open.
If operation is not as specified, replace the No.2 turbocharger
assembly.
NOTICE: Never apply more than 187 kPa (1.91 kgf/cm2, 27.2
psi) of pressure to the actuator.
(d) Remove the plug from the actuator air hose end.
Intake Air Control Valve
INSPECT CONTROL VALVE OPERATION
(a) Using SST, apply approx. 49 kPa (0.50 kgf/cm
2, 7.1 psi) of
pressure to the actuator.
SST 09992±00241
(b) Move the actuator push rod, and check that the control valve
is open.
If operation is not as specified, replace the control valve as-
sembly.
Exhaust Gas Control Valve
INSPECT CONTROL VALVE FOR DAMAGE
Move the actuator push rod and control valve, and check the
control valve for damage.
If the valve is damaged, replace the control valve assembly.
Air Bypass Valve
INSPECT AIR BYPASS VALVE OPERATION
(a) Check that air does not flow from port A to B.
(b) Apply vacuum to the actuator.
(c) Check that air flows from port A to B.
If operation is not as specified, replace the valve.
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±159

CHARGE AIR COOLER (CAC)
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±160± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

CAC REMOVAL
Installation is in the reverse order of removal.
1. REMOVE NO.1 AIR HOSE
2. REMOVE ENGINE UNDER COVER
3. w/o Auto Spoiler:
REMOVE NO.2 ENGINE UNDER COVER
4. REMOVE RH FRONT FENDER SPLASH SHIELD SEAL
5. w/ Auto Spoiler:
REMOVE RH ENGINE UNDER COVER
6. DISCONNECT AIR HOSE FROM CAC
(a) Remove the 2 bolts holding the No.2 air tube (3) to the body.
(b) Disconnect these hoses:
(1) No.2 air hose from CAC
(2) No.4 air hose from No.2 air tube
(3) No.3 air hose from CAC
(c) Remove the No.2 air tube (4).
7. REMOVE CAC AND CAC DUCT ASSEMBLY
w/o Auto Spoiler:
Remove the nut, 2 bolts and CAC.
Torque: 13 NVm (135 kgfVcm, 10 ftVlbf)
w/ Auto Spoiler:
(a) Fully turn the tire in the illustration direction.
(b) Remove the nut, 2 bolts and CAC.
Torque: 13 NVm (135 kgfVcm, 10 ftVlbf)
HINT: Remove the CAC between the suspension and body
at the illustrated angle of the CAC.
8. REMOVE CAC DUCT FROM CAC
Remove the 4 bolts and CAC duct.
Torque: 4.9 NVm (50 kgfVcm, 43 in.Vlbf)
± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)EG±161

SERVICE SPECIFICATIONS
SERVICE DATA
 
 
 
Turbocharger 
 
 
Turbocharging pressure
Impeller wheel axial play Limit
Impeller wheel radial play Limit 
 
 
61±75 kPa (0.62±0.76 kgf/cm2, 8.8±10.8 psi)
0.162 mm (0.0064 in.)
0.110 mm (0.0045 in.)
TORQUE SPECIFICATIONS
 
 Part tightened 
 NVm 
 kgfVcm 
 ftVlbf
 Turbocharger x Turbine outlet elbow 25 250 18
 Turbo water pipe x Turbocharger 8.8 90 78 in.Vlbf
 Side bearing housing plate x Turbocharger 8.8 90 78 in.Vlbf
 No.2 air tube x No.2 turbocharger 21 210 15 
 Turbocharger x Exhaust manifold
 
 54
 
 550
 
 40
 Turbo oil pipe x Turbocharger 21 210 15
 Turbo oil pipe x Cylinder block 39 400 29
 Turbocharger stay x Turbocharger 43 440 32 
 Turbocharger stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust gas control valve x Turbine outlet elbow 69 700 51
 Main heated oxygen sensor x Exhaust gas control valve 20 200 14
 Exhaust gas control valve stay x Exhaust gas control valve 43 440 32 
 Exhaust gas control valve stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust bypass pipe x Turbine outlet elbow 25 250 18
 Exhaust bypass pipe x Exhaust gas control valve 25 250 18
 Intake air control valve x No.2 turbocharger 21 210 15 
No.4 air tube x No.1 turbocharger 
21 
210 
15 
 No.1 air tube x No.1 turbocharger
 
 21
 
 210
 
 15
 No.2 front exhaust pipe x Exhaust gas control valve 62 630 46
 Front exhaust pipe x No.2 front exhaust pipe 58 590 43
 Pipe support bracket x Transmission 43 440 32 
 
 
Upper front crossmember extension x Front suspension Bolt
Nut
 
 
 
29
33
 
 
 
300
340
 
 
 
22
25
 
 
Front lower arm bracket stay x Front suspension Bolt
Nut 
 
44
59 
 
450
600 
 
33
43
 CAC duct x CAC 4.9 50 43 in.Vlbf
 CAC x Body 13 135 10
EG±162± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)

2JZ±GTE ENGINE TROUBLESHOOTING
EG±487