1991 LEXUS SC400 engine

31. INSTALL LH NO.3 TIMING BELT COVER(a) Install the three gaskets to the timing belt cover.
(b) Install the cord grommet to the high±tension cord.
(c) Install the cord grommet to the timing belt cover.
(d) Fit portion A of the timing belt cover, matching it with the
lower high±tension cord cover.
(e) Install the timing belt cover with the four bolts.
32. INSTALL RH ENGINE WIRE COVER (a) Fit portions A and B of the engine wire cover, matchingthem with the lower high±tension cord cover and No. 3
timing belt cover.
(b) Install the engine wire cover with the bolt.
33. INSTALL LH ENGINE WIRE COVER (a) Connect portions A and B of the engine wire cover to the
wire cover brackets.
(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.
(b) Install the engine wire cover with the two bolts.
34. INSTALL UPPER HIGH±TENSION CORD COVER (a) Fit portion A of the upper high±tension cover, matchingit 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.
±
ENGINE MECHANICAL Timing BeltEM±55
WhereEverybodyKnowsYourName

35. INSTALL LH IGNITION COIL(a) Install the ignition coil with the two bolts.
(b) Connect the following connectors and cord:(1) Ignition coil connector
(2) Noise filter connector
(3) High±tension cord
36. INSTALL INTAKE AIR CONNECTOR (a) Connect the end portions of the intake air connector tothe throttle body and air cleaner hose.
(b) Tighten the two hose clamps.
(c) Install the bolt holding the intake air connector to the cylinder head cover.
(d) Connect the following hoses: (1) Air hose to ISC valve
(2) Air hose (from PS air control valve) to intake air connector
EM±56
±
ENGINE MECHANICAL Timing Belt
WhereEverybodyKnowsYourName

37. INSTALL A/C COMPRESSOR(a) In sta ll th e A/C co mp re sso r, co mp re sso r sta y an dground cable with the three bolts and nut.
Torque: Bolt 49 N Vm (500 kgf Vcm, 36 ft Vlbf)
Nut 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
(b) Connect the A/C compressor connector.
38. INSTALL RADIATOR AND RESERVOIR TANK (See steps 25 and 26 on pages EM±174 to 175)
39. INSTALL DRIVE BELT Install the drive belt by turning the drive belt tensioner coun-
terclockwise.
HINT: The pully bolt for the belt tensioner has a lefthand
thread.
40. INSTALL BATTERY
41. FILL WITH ENGINE COOLANT (See page CO±7)
42. CHECK IGNITION TIMING (See page IG±28)
Ignition timing:
8±125 BTDC @ idle
(w/ Terminals TE1 and E1 connected)
43. INSTALL ENGINE UNDER COVER
±
ENGINE MECHANICAL Timing BeltEM±57
WhereEverybodyKnowsYourName

CYLINDER HEAD
COMPONENTS FOR REMOVAL AND
INSPECTION
EM±34±
ENGINE MECHANICAL Cylinder Head
WhereEverybodyKnowsYourName

COMPONENTS FOR REMOVAL AND
INSTALLATION (Cont'd)
±
ENGINE MECHANICAL Cylinder HeadEM±35
WhereEverybodyKnowsYourName

REMOVAL OF CYLINDER HEAD
(See Components on pages EM±34 and 35)1. DISCONNECT HIGH±TENSION CORDS FROM SPARK PLUGS
(See steps 1 to 8 on pages EM±10 and 11)
2. REMOVE SPARK PLUGS (See step 2 on page IG±8)
3. REMOVE DISTRIBUTOR AND CORDS
(See pages IG±11 and 12)
4. REMOVE WATER PUMP PULLEY AND RADIATOR (See steps 1 to 3, 6 and 7 on pages EM±64 to 66)
5. DISCONNECT TIMING BELT FROM CAMSHAFT TIMING PULLEYS
(See steps 2 to 5 on pages EM±24 and 25)
NOTICE:
wSupport the timing belt, so that the meshing of the
crankshaft timing pulley and timing belt does not shift.
w Be careful not to drop anything inside the timing belt
cover.
w Do not allow the timing belt to come into contact with oil,
water or dust.
6. REMOVE NO. 2 FRONT EXHAUST PIPE (See step 2 on page EM±71)
7. REMOVE EXHAUST MANIFOLDS (a) Disconnect the two oxygen sensor connectors.
(b) Remove the four nuts and manifold heat insulator.
(c) Remove the four nuts, exhaust manifold and gasket.Remove the No. 1 and No. 2 exhaust manifolds.
EM±36
±
ENGINE MECHANICAL Cylinder Head
WhereEverybodyKnowsYourName

8. REMOVE WATER BY±PASS OUTLET AND NO. 1 WATERBY±PASS PIPE
(a) Remove the two bolts, water by±pass outlet and No. 1water by±pass pipe.
(b) Remove the three O±rings from the water by±pass outlet and No. 1 water by±pass pipe.
9. REMOVE WATER OUTLET AND NO. 1 BY±PASS HOSE (a) Remove the two nuts, bolt and water outlet.
(b) Disc onnect the No. 1 by±pass hose from the hose
clamp.
10. REMOVE VACUUM CONTROL VALVE SET AND NO. 2 VACUUM PIPE
(a) Disconnect the two connectors from the VSV.
(b) Disconnect the following hoses:(1) Vacuum hose from ACIS vacuum tank
(2) Three vacuum hoses from VSV
(c) Remove the four nuts, vacuum control valve set and
vacuum pipe.
11. REMOVA OIL DIPSTICK GUIDES FOR ENGINE AND TRANSMISSION (A/T)
(a) Disconnect the fuel return hose from the engine oildipstick guide.
(b) Remove the mounting bolt.
(c) Pull out the dipstick guide together with dipstick. Plug the oil pan.
(d) Remove the O±ring from the dipstick guide.
12. REMOVE AIR INTAKE CHAMBER (a) Remove the bolt, nut and intake chamber stay. Removethe No. 1 and No. 2 stays.
±
ENGINE MECHANICAL Cylinder HeadEM±37
WhereEverybodyKnowsYourName

(b) Disconnect the following hoses:(1) Vacuum hose from brake booster union
(2) Vacuum hose (from ACIS vacuum tank)
(3) Vacuum sensing hose
(4) Air hose (from PS air control valve)
(c) Remove the two bolts, and disconnect the data link connector 1 and harness protector from the air intake
chamber.
(d) Remove the five bolts, two nuts and air intake chamber and gasket.
13. REMOVE DELIVERY PIPE AND INJECTORS (See steps 4, 5, 8 and 10 on pages FI±28 and 29)
14. REMOVE NO. 1 AND NO. 2 FUEL PIPES
15. DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD (a) Disconnect the following connectors:
(1) Engine coolant temperature sensor connector
(2) Engine coolant temperature sender gauge connec- tor
(3) Two knock sensor connectors
(4) Oil pressure switch connector
(5) Oil level sensor connector
(6) A/C compressor connector
(b) Remove the three nuts and two clamp bolts.
(c) Remove the two bolts, and disconnect the harness
protector from the intake manifold.
16. REMOVE INTAKE MANIFOLD (a) Remove the two bolts and intake manifold stay.
(b) Remove the six bolts, two nuts, intake manifold andgasket.
EM±38
±
ENGINE MECHANICAL Cylinder Head
WhereEverybodyKnowsYourName