1991 LEXUS SC400 fuel pressure

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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TORQUE SPECIFICATIONS (Cont'd)
 Part tightened  NVm kgf Vcm ft Vlbf
 Main bearing cap X Cylinder block 1st 44 450 33
  2nd Turn 90 5  
 Connecting rod cap X Connecting rod 1st 29 300 22
2ndTurn 905 Rear oil seal retainer X Cylinder block  5.9 60 52 in.Vlbf Oil filter bracket X Cylinder block  88 900 65 LH engine mounting bracket X Cylinder block  58 590 43 RH engine mounting bracket X Cylinder block  58 590 43
 Knock sensor X Cylinder block  44 450 33
 Oil pressure switch X Cylinder block  14 150 11
 Fuel pipe support X Cylinder block  14 145 10
 Fuel pressure pulsation damper  41 420 30
  (for SST) 35 350 25
 Generator X Cylinder block  37 380 27
Flywheel X Crankshaft (M/T)1st4950036  2nd Turn 90 5  
 Drive Plate X Crankshaft (A/T)  98 1,000 72 Starter X Transmission  39 400 29 Oil cooler pipe X Transmission (A/T)  34 350 25
 Rear engine mounting member X Body  25 260 19
 


Rear engine mounting member X Engine mounting
insulator 


 


13 


135 


10
 Intermediate shaft X Propeller shaft  74 750 54
 Propeller shaft center bearing X Body  49 500 36
No.2 front exhaust pipe X Exhaust manifold6263046 Front exhaust pipe X No.2 front exhaust pipe  43 440 
 Clutch release cylinder X Transmission (M/T)  12 120 9 Fuel inlet hose X Fuel pipe support  34 350 25 A/C compressor X Cylinder block Through bolt 26 265 19
  Bolt and nut 52 530 38
 PS pump X Cylinder block  58 590 43
 PS pump X A/C compressor  58 590 43
 PS pump X Pump rear stay  39 400 29
 Cylinder block X Pump rear stay  39 400 29
 Fluid coupling X Water water pump  16 165 12
±
ENGINE MECHANICAL Service SpecificationsEM±117
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INSPECTION OF INJECTORS
1. INSPECT INJECTOR INJECTIONCAUTION: Keep injector clear of sparks during the test.
(a) Disconnect the fuel inlet hose from the fuel tube.
(b) Connect SST (hose) to the fuel inlet tube with SST(union). Tighten the flare nut on the fuel tube.
SST 09268±41045 (90405±52010)
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Use SST. (See page FI±15)
SST 09631±22020
(c) Loosen the lock nut, and remove the pressure regulator from the RH delivery pipe. Remove the O±ring from the
pressure regulator.
(d) Install a new O±ring to the fuel inlet of the pressure regulator.
(e) Connect SST (hose) to the pressure regulator with SST (union). Tighten the lock nut on the pressure regulator.
SST 09268±41045 (09268±52010)
Torque: 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
(f) Connect the fuel return hose to the fuel outlet of the
pressure regulator with SST (union), two new gaskets
and union bolt.
SST 09268±41045 (09268±41070)
FI±52EFI SYSTEM ± Fuel System (Injectors)
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(e) Reinstall the fuel pressure regulator to the RH deliverypipe.
w Fully loosen the lock nut on the pressure regulator.
w Apply a light coat of gasoline to a new O±ring, and
install it to the pressure regulator.
w Completely insert the pressure regulator into the
delivery pipe by hand.
w Turn the pressure regulator counterclockwise until
the vacuum sensing port faces in the direction
indicated in the illustration.
INSTALLATION OF INJECTORS
(See Components on page FI±49)
1. INSTALL INJECTORS AND DELIVERY PIPE (a) Install the grommet to each injector.
(b) Apply a light coat of gasoline to a new O±ring and install
it to each injector.
(c) W h i l e t u r n i n g t h e i n j e c t o r c l o c k w i s e a n d counterclockwise, push it to the delivery pipes. Install
the eight injectors.
(d) Position the injector connector outward.
(e) Place the eight insulators and four spacers in position on the intake manifold.
FI±54
EFI SYSTEM
± Fuel System (Injectors)
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(f) Place the eight injectors and two delivery pipesassembly in position on the intake manifold.
(g) Temporarily install the c onnector bracket and four
mounting bolts.
(h) Check that the injectors rotate smoothly.
HINT: If injectors do not rotate smoothly, the probable cause
is incorrect installation of O±rings. Replace the O±rings.
(i) Position the injector connector outward.
(j) Tighten the four bolts holding the delivery pipes to the intake manifold.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
2. INSTALL FUEL RETURN PIPE
(a) Temporarily install the return pipe with the bolt, two
gaskets and union bolt.
(b) Tighten the union bolt holding the return pipe to the pressure regulator.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(c) Tighten the bolt holding the return pipe to the LH cylinder
head.
3. TIGHTEN LOCK NUT ON FUEL PRESSURE REGULATOR
Torque: 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
FI±55EFI SYSTEM ± Fuel System (Injectors)
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Fuel Pressure Pulsation Damper
COMPONENTS FOR REMOVAL AND
INSTALLATION
FI±58 ± Fuel System (Fuel Pressure Pulsation Damper)EFI SYSTEM
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REMOVAL OF FUEL PRESSURE
PULSATION DAMPER
(See Component on page FI±58)
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. REMOVE UPPER HIGH±TENSION CORD COVER (a) Remove the two mounting bolts.
(b) Disconnect the front side claw groove of the cord coverfrom the claw of the lower cover, and remove the cord
cover.
3. REMOVE LH ENGINE WIRE COVER Remove the two bolts and engine wire cover.
4. REMOVE FUEL PRESSURE PULSATION DAMPER (a) Remove the pulsation damper and upper gasket.
(b) Disconnect the fuel inlet hose from the delivery pipe,and remove the lower gasket. FI±59
EFI SYSTEM
± Fuel System (Fuel Pressure Pulsation Damper)
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