engine LEXUS SC400 1991 Service Repair Manual

EG±138±
1UZ±FE ENGINE ENGINE MECHANICAL
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ENGINE REMOVAL
EG24W±02
(See Components for Engine Removal and Installation)
1. REMOVE BATTERYCAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº posi-
tion and the negative (±) terminal cable is disconnected
from the battery.
2. REMOVE HOOD
3. REMOVE ENGINE UNDER COVER
4. DRAIN ENGINE COOLANT
5. DRAIN ENGINE OIL
6. REMOVE DRIVE BELT Loosen the drive belt tension by turning the drive belt tension-
er counterclockwise, and remove the drive belt.
HINT: The pulley bolt for the drive belt tensioner has a left±
hand thread.
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7. REMOVE THROTTLE BODY COVER
(a) Disconnect the EVAP hose from the hose clamp.
(b) Remove the cap nut.
(c) Loosen the 2 bolts, and remove the hose clamp and throttlebody cover.
8. DISCONNECT CONTROL CABLES TO THROTTLE BODY Disconnect the following cables:
(1) Accelerator cable
(2) Transmission throttle control cable
(3) Cruise control actuator cable
9. REMOVE AIR CLEANER
(a) Disconnect the VAF meter connector.
(b) Remove the hose clamp bolt holding the air cleaner hose to the intake air connector.
(c) Remove the 4 bolts.
(d) Disconnect the air cleaner hose from the intake air connector.
(e) Disconnect the air duct from the air cleaner case, and remove
the air cleaner.
10. D I S C O N N E C T VA CUUM HOSE (A) (FROM PS AIR
CONTROL VALVE) FROM AIR INTAKE CHAMBER
11. REMOVE INTAKE AIR CONNECTOR
(a) Disconnect the following hoses from the intake air connector:
(1) Air hose (from IAC valve)
(2) Air hose (from air control valve on PS pump)
(b) Remove the hose clamp bolt holding the intake air connector to the throttle body.
(c) Remove the bolt and intake air connector.
EG±140
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1UZ±FE ENGINE ENGINE MECHANICAL
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12. REMOVE RADIATOR RESERVOIR TANK
(a) Disconnect the coolant level sensor connector.
(b) Disconnect the following hoses:(1) Reservoir hose from water inlet housing
(2) Reservoir hose from radiator
(c) Remove the 2 bolts and reservoir tank bracket.
(d) Remove the bolt holding the reservoir tank to the radiator.
(e) Disconnect the reservoir tank from the reservoir tank bracket,
and remove the reservoir tank.
13. REMOVE RADIATOR ASSEMBLY
(a) Disconnect the ECT sensor connector (for cooling fan).
(b) Disconnect the ECT sensor wire clamp from the radiator fan shroud.
(c) Disconnect the following hoses: (1) 2 oil cooler hoses (for cooling fan) from pipes
(2) 2 radiator hoses
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(3) 2 oil cooler hoses (for transmission) from radiator
HINT: Plug the hose ends.
(4) Suction hose from hydraulic pump
(5) Pressure hose from hydraulic pump
(d) Remove the 2 bolts, screw and upper radiator support. Remove the 2 upper radiator supports.
(e) Slightly lift the radiator, and disconnect the 2 oil cooler hoses (for cooling fan) from the hose clamp on the radiator fan
shroud.
(f) Remove the radiator assembly.
(g) Remove the 2 lower radiator supports from the radiator.
14. DISCONNECT IGNITER CONNECTORS
(a) Disconnect the 2 igniter connectors.
(b) Disconnect the wire clamp from the body.
EG±142
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1UZ±FE ENGINE ENGINE MECHANICAL
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15. DISCONNECT ENGINE WIRE CONNECTORS
16. DISCONNECT THEFT DETERRENT HORN CONNECTOR
17. DISCONNECT GROUND CABLE FROM BODY
18. DIS CO NNE CT PO WE R STE E RING (P S ) SO LE NO IDVALVE CONNECTOR
19. DISCONNECT WIRE CLAMP (FOR GENERATOR) FROM VSV (FOR EVAP)
(a) Remove the 2 bolts, and disconnect the VSV from the RH
cylinder head.
(b) Disconnect the wire clamp from the VSV bracket.
20. REMOVE GENERATOR
(a) Disconnect the generator connector.
(b) Remove the cap and nut, and disconnect the generator wire.
(c) Remove the bolt, and disconnect the transmission oil cooler pipe bracket from the generator.
(d) Remove the nut and generator.
21. DISCONNECT POWER STEERING (PS) TUBES FROM SUSPENSION CROSSMEMBER
Remove the clamp bolt, and disconnect the PS tubes.
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22. DISCONNECT POWER STEERING (PS) RESERVOIRTANK AND BRACKET FROM BODY
Remove the 3 bolts, and disconnect the reservoir tank and
bracket assembly.
23. DISCONNECT POWER STEERING (PS) PUMP FROM ENGINE
Remove the nut and 3 bolts, and disconnect the PS pump
from the engine.
HINT: Put aside the PS pump, and suspend it.
24. DISCONNECT AIR CONDITIONING (A/C) COMPRESSOR FROM ENGINE
(a) Disconnect the A/C compressor connector.
(b) Remove the nut, and disconnect the ground cable from the
A/C compressor stay.
(c) Remove the bolt and A/C compressor stay.
(d) Remove the 2 bolts, and disconnect the A/C compressor from the engine.
HINT: Put aside the A/C compressor, and suspend it.
25. DISCONNECT HOSES Disconnect the following hoses and ground strap:
(1) Heater water hose from water bypass hose
(2) Heater water hose from heater water valve
(3) Brake booster hose from union on air intake chamber
(4) Vacuum hose (from VSV for heater water valve) from air
intake chamber
(5) Ground strap from bracket on body.
EG±144
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1UZ±FE ENGINE ENGINE MECHANICAL
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(6) Fuel inlet hose from fuel tube
(7) Fuel return hose from return pipe
HINT: Plug the hose ends.
26. REMOVE CHARCOAL CANISTER
(a) Disconnect the vacuum hose and air hose from from the charcoal canister.
(b) Remove the charcoal canister.
27. DISCONNECT ENGINE WIRE FROM CABIN
(a) Remove the 2 clips, and pull out the instrument panel under cover.
(b) Remove the 4 screws.
(c) Disconnect the connectors, and remove the lower instrument
panel finish panel and glove compartment door assembly.
(d) Pull out the scuff plate.
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(e) Take out the front side of the floor carpet.
(f) Remove the 2 nuts and ECM protector.
(g) Remove the nut, and disconnect the ECM from the floorpanel.
(h) Disconnect the following connectors: (1) 2 connectors from ECM
(2) Connector from ABS & TRAC ECU
(3) 2 connectors from TRAC ECU
(4) 4 connectors from connector cassette
(5) Connector from A/C control assembly
EG±146
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1UZ±FE ENGINE ENGINE MECHANICAL
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(i) Remove the bolt holding the engine wire clamp to the heaterwater valve bracket.
(j) Remove the 2 bolts holding the engine wire clamp to the
body.
(k) Pull out the engine wire from the cabin.
NOTICE: Be careful not to damage the engine wire.
28. DISCONNECT SUB HEATED OXYGEN SENSORS FROM FRONT EXHAUST PIPE
(a) Disconnect the 2 wire grommets from the floor panel.
(b) Disconnect the 2 oxygen sensors from the exhaust pipe.
29. REMOVE FRONT EXHAUST PIPE
(a) Remove the 4 bolts holding the pipe support bracket to the transmission.
(b) Remove the 2 bolts and nuts holding the front exhaust pipe to the center exhaust pipe.
(c) Remove the 4 bolts and nuts holding the front exhaust pipe to the TWC.
(d) Remove the pipe support bracket, front exhaust pipe and 3 gaskets.
30. REMOVE TWC (FRONT) Using a 14 mm deep socket wrench, remove the 3 nuts, TWC
and gasket. Remove the 2 TWC.
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