1991 LEXUS SC300 timing belt

5. REMOVE AIR CLEANER ASSEMBLY(a) Disconnect the high±tension cord from the ignition coil.
(b) Disconnect the volume air flow meter connector.
(c) Disconnect the following hose:(1) PS air hose from No. 4 timing belt cover
(2) PCV hose from No. 2 cylinder head cover
(d) Loosen the hose clamp holding the air cleaner hose to the throttle body.
(e) Remove the three mounting bolts and air cleaner.
6. REMOVE DRIVE BELT, FAN WITH FLUID COUPLING AND
WATER PUMP PULLEY
(a) Loosen the four nuts holding the fluid coupling to the water pump.
(b) Loosen the drive belt tension by turning the drive belt tensioner clockwise, and remove the drive belt.
(c) Remove the four nuts, fluid coupling and water pump
pulley.
7. REMOVE RADIATOR (a) Disconnect the following hoses:(1) Reservior hose from radiator
(2) Upper radiator hose from water inlet
(3) Lower radiator hose from water outlet
(4) (A/T)Two oil cooler hoses from radiator
Plug the hose ends.
±
ENGINE MECHANICAL Cylinder BlockEM±65
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(b) Remove the two bolts, screw and upper radiatorsupport. Remove the two upper radiator supports.
(c) Lift out the radiator with the hoses.
8. REMOVE CHARCOAL CANISTER (a) Disconnect the vacuum hose and air hose from thecharcoal canister.
(b) Remove the charcoal canister.
9. DISCONNECT PS PUMP WITHOUT DISCONNECTING HOSES
(a) Disconnect the following hoses:(1) PS air hose from No. 4 timing belt cover
(2) PS air hose from air intake chamber
(b) Remove the bolt, nut and pump rear stay.
(c) Remove the two bolts, and disconnect the PS pump from the engine.
HINT: Put aside the PS pump, and suspend it.
10. D I S C O N N E C T A / C C O M P R ESSOR WITHOUT
DISCONNECTING HOSES
(a) Disconnect the compressor connector.
(b) Remove the three mounting bolts and nut.
(c) R e m o v e t h e t h r ough bolt, and disconnect the
compressor from the engine.
HINT: Put aside the compressor, and suspend it.
11. DISCONNECT ENGINE WIRE AND HOSES (a) Disconnect the brake booster vacuum hose from theunion.
(b) Disconnect the fuel return hose from the engine oil dipstick guide clamp and No. 2 fuel pipe. Plug the hose
end.
EM±66
±
ENGINE MECHANICAL Cylinder Block
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PREPARATION FOR DISASSEMBLY
(See Components on pages EM±74 and 75)1. (M/T) REMOVE FLYWHEEL
2. (A/T) REMOVE DRIVE PLATE
Remove the eight bolts, two spacers and drive plate.
3. INSTALL ENGINE TO ENGINE STAND FOR DISASSEMBLY
4. REMOVE GENERATOR
5. REMOVE THROTTLE BODY WITH INTAKE AIR CONNECTOR (See pages EM±10 to 11)
6. REMOVE TIMING BELT AND PULLEYS (See pages EM±24 to 26)
7. REMOVE WATER PUMP AND BY±PASS HOSE
8. REMOVE FUEL PRESSURE PULSATION DAMPER
9. REMOVE CYLINDER HEAD (See pages EM±36 to 40)
10. REMOVE FUEL PIPE SUPPORT
11. REMOVE OIL PRESSURE SWITCH AND KNOCK SENSORS
SST 09816±30010
12. REMOVE LH ENGINE MOUNTING BRACKET
13. REMOVE RH ENGINE MOUNTING BRACKET
14. REMOVE OIL FILTER BRACKET (a) Remove the union bolt and oil filter bracket.
(b) Remove the gasket from the union bolt.
(c) Remove the O±ring from the oil filter bracket.
15. REMOVE OIL PUMP (See page LU±10)
EM±76
±
ENGINE MECHANICAL Cylinder Block
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5. INSTALL KNOCK SENSORS AND OIL PRESSURESWITCH
Using SST, install the two knock sensors and oil pressure
switch.
SST 09816±30010
Torque:
Knock sensor 44 N Vm
(450 kgf Vcm, 33 ft Vlbf)
Oil pressure switch 14 N Vm
(150 kgf Vcm, 11 ft Vlbf)
6. INSTALL FUEL PIPE SUPPORT
Torque: 14 N Vm (145 kgf Vcm, 10 ft Vlbf)
7. INSTALL CYLINDER HEAD
(See pages EM±54 to 57)
Torque: 1st 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
2nd turn 90 5
3rd turn 90 5
8. INSTALL FUEL PRESSURE PULSATION DAMPER
(See step 1 on page FI±36)
Torque: 41 N Vm (420 kgf Vcm, 30 ft Vlbf)
35 N Vm (350 kgf Vcm, 25 ft Vlbf) for SST
9. INSTALL WATER PUMP AND BY±PASS PIPE
(a) Install the water pump. (See page CO±7)
(b) Install the No. 2 water by±pass pipe with the bolt.
(c) Connect the No. 2 water by±pass hose to the engine hanger.
10. INSTALL THROTTLE BODY WITH INTAKE AIR
CONNECTOR
(See page EM±18)
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
11. INSTALL TIMING PULLEYS AND BELT
(See pages EM±29 to 33)
12. INSTALL GENERATOR
Torque: 37 N Vm (380 kgf Vcm, 27 ft Vlbf)
13. REMOVE ENGINE STAND FROM ENGINE
±
ENGINE MECHANICAL Cylinder BlockEM±101
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(p) Connect the fuel return hose to the No. 2 fuel pipe andengine oil dipstick guide clamp.
(q) Connect the brake booster vacuum hose to the union.
12. INSTALL A/C COMPRESSOR (a) Install the A/C compressor with the through bolt, nut and
three bolts.
Torque: Through bolt 26 N Vm (265 kgf Vcm, 19 ft Vlbf)
Bolt and nut 52 N Vm (530 kgf Vcm, 38 ft Vlbf)
(b) Connect the A/C compressor connector.
13. INSTALL PS PUMP (a) Install the PS pump and pump rear stay with the threebolts and nut. Alternately tighten the bolts and nut.
Torque:
(A) 58 N Vm (590 kgf Vcm, 43 ft Vlbf)
(B) 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
(b) Connect the following hoses:
(1) PS air hose to No. 4 timing belt cover
(2) PS air hose to air intake chamber
14. INSTALL CHARCOAL CANISTER (a) Install the charcoal canister.
(b) Connect the vacuum hose and air hose to the charcoalcanister.
15. INSTALL RADIATOR (a) Place the radiator on the body bracket.
(b) Install the upper radiator support with the two bolts andscrew. Install the two upper radiator supports.
EM±110
±
ENGINE MECHANICAL Cylinder Block
WhereEverybodyKnowsYourName

(c) Install the hose clamp.
(d) Connect the following hoses:(1) PS air hose to No. 4 timing belt cover
(2) PCV hose to No. 2 cylinder head cover
(e) Connect the volume air flow meter connector.
(f) Connect the high±tension cord to the ignition coil.
18. CONNECT CONTROL CABLES TO THROTTLE BODY Connect the following cables:(1) Accelerator cables
(2) (A/T)
Throttle control cable
(3) Cruise control actuator cable
19. INSTALL BATTERY
20. FILL ENGINE WITH COOLANT (See page CO±5)
Capacity (w/Heater): M/T 8.5 liters (9.0 US qts, 7.5 lmp. qts)
A/T 8.4 liters (8.9 US qts, 7.4 lmp. qts)
21. START ENGINE AND CHECK FOR LEAKS
22. (A/T)CHECK AUTOMATIC TRANSMISSION FLUID LEVEL
(See page MA±11)
NOTICE: Do not overfill.
23. CHECK IGNITION TIMING (See page IG±14)
Ignition timing:
105 BTDC @ idle
(w/ Terminals TE1 and E1 connected)
24. INSTALL ENGINE UNDER COVER
25. INSTALL HOOD
26. PERFORM ROAD TEST Check for abnormal noise, shock, slippage, correct shift
points and smooth operation.
27. RECHECK ENGINE COOLANT AND ENGINE OIL LEVELS
EM±112
±
ENGINE MECHANICAL Cylinder Block
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SERVICE DATA (Cont'd)
TORQUE SPECIFICATIONS
\
\
Part tightened  NVm kgf Vcm ft Vlbf
\
\
Camshaft bearing cap X Cylinder head  20 200 14
\
No.1 cylinder head cover X Cylinder head5.45548 in. Vlbf\
\
No.2 cylinder head cover X Cylinder head  5.4 55 48 in. Vlbf\
\
Intake air connector X Air intake chamber  21 210 15\
\
Throttle body bracket X Throttle body  21 210 15\
\
Throttle body bracket X Cylinder head  21 210 15
\
\
EGR pipe X Intake manifold  21 210 15
\
\
EGR pipe X EGR valve  64 650 47
\
\
Spark plug X Cylinder head  18 180 13
\
\
Throttle body X Intake air connector  21 210 15
\
\
Idler pulley X Oil pump  34 350 25
\
Crankshaft pulley X Crankshaft3243,300239\
\
Camshaft timing pulley X Camshaft  79 810 59\
\
Timing belt tensioner X Oil pump  26 270 20\
\
Drive belt tensioner X Cylinder head  21 210 15\
\
EGR cooler X Cylinder head  14 140 10
\


\
Engine coolant temperature sensor X Cylinder
head 


 


20 


200 


14
\


\
Engine coolant temperature sender gauge X Cylin-
der head 


 


20 


200 


14
\
\
Engine hanger X Cylinder head  39 400 29
\
Cylinder head X Cylinder block1st3435025\
\
 2nd Turn 90
5  
\
\
 3rd Turn 905  
\
\
No.4 Timing belt cover X Cylinder head  8.8 90 78 in.Vlbf\
\
Intake manifold X Cylinder head  21 210 15
\
\
Intake manifold stay X Intake manifold  39 400 29
\
\
Intake manifold stay X Cylinder head  39 400 29
\
\
No.1 fuel pipe X Intake manifold  8.8 90 78 in. Vlbf
\
\
No.2 fuel pipe X Intake manifold  8.8 90 78 in. Vlbf
\
\
Delivery pipe X Intake manifold  21 210 15
\
\
Air intake chamber X Intake manifold  21 210 15
\
Air intake chamber stay X Air intake chamber1818513\
\
Air intake chamber stay X Cylinder head  18 185 13\
\
Vacuum control valve set X Intake manifold  21 210 15\
\
No.2 vacuum pipe X Air intake chamber  21 210 15\
\
Water outlet X Cylinder head  21 210 15
\
\
Water by±pass outlet X Cylinder head  8.8 90 78 in. Vlbf
\
\
Exhaust manifold X Cylinder head  39 400 29
\
\
Exhaust manifold heat insulator X Exhaust manifold  18 185 13
EM±116±
ENGINE MECHANICAL Service Specifications
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INSTALLATION OF FUEL PRESSURE
PULSATION DAMPER
(See Components on page FI±58)
1. INSTALL FUEL PRESSURE PULSATION DAMPER Using SST, install two new gaskets, the inlet hose and pulsa-
tion damper.
SST 09612±24014 (09617±24011)
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
33 N Vm (340 kgf Vcm, 24 ft Vlbf) for SST
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.)
2. INSTALL LH ENGINE WIRE COVER
(a) Connect portions A and B engine wire cover to the wirebrackets.
(b) Set the VSV (for fuel pressure control system) wire in original position.
(c) Fit portions C and D of the engine wire cover, matching them with the lower high±tension cord cover and No.3
timing belt cover.
(d) Install the engine wire cover with the two bolts.
3. INSTALL UPPER HIGH±TENSION CORD COVER (a) Fit portion A of the upper high±tension cover, matching
it with the top of the lower high±tension cord cover.
(b) Push the front side of the high±tension cord cover, and connect the front side claw groove of the upper
high±tension cord cover to the claw of the lower
high±tension cord cover.
(c) Install the upper high±tension cord cover with the two bolts.
4. CONNECT CABLE TO NEGATIVE TERMINAL OF BATTERY
5. CHECK FOR FUEL LEAKS (See page FI±16)
FI±60
EFI SYSTEM
± Fuel System (Fuel Pressure Pulsation Damper)
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