remove cylinder head LEXUS LS430 2003 Factory Repair Manual

psi), and check that the pressure does not drop.
If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found,
check the heater core, cylinder block and head.
2.CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. Check that the engine coolant level is between the LOW and FULL lines when the engine is cold.
If the engine coolant is low, check for leaks and add "TOYOTA Super Long Life Coolant" to the
FULL line.
If "TOYOTA Super Long Life Coolant" is not available, use a similar high quality ethylene glycol
based non-silicate, non-amino, non-nitrite and non-borate coolant with long-life hybrid organic acid
technology. Do not substitute plain water for engine coolant.
3.CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
b. Check if there are any excessive deposits of rust or scale around the radiator cap and radiator filler
hole, Also, the coolant should be free from oil.
HINT:
If excessively dirty, clean the coolant passage and replace the coolant.
c. Reinstall the radiator cap.
INSPECTION
1. INSPECT THERMOSTAT
HINT:
The thermostat is stamped with the valve openin
g temperature.

Fig. 22: Removing Bolts And Disconnecting Engine Wire Protector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
k. Disconnect the 2 wire clamps on the engine wire (RH side) from the brackets on the RH delivery
pipe.
l. Remove the 2 bolts, and disconnect the engine wire protector (rear side) from the rear water bypass
joint and RH cylinder head.
m. Disconnect the 8 injector connectors.
Fig. 23: Identifying Bolts

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
n. Remove the 6 bolts, 4 nuts, the upper and lower intake manifolds assembly and 2 gaskets.
8.REMOVE KNOCK SENSOR

Fig. 10: Locating Mark
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.INSTALL AIR CLEANER INLET NO.1
ADJUSTMENT
1.REMOVE V-BANK COVER
2.REMOVE CYLINDER HEAD COVER SUB-ASSY (See REPLACEMENT
)
3.REMOVE CYLINDER HEAD COVER SUB-ASSY LH (See REPLACEMENT
)
4.SET NO. 1 CYLINDER TO TDC/COMPRESSION
a. Turn the crankshaft damper, and align its groove with timing mark "0" of the timing belt No. 1
cover.

a. Check the steering wheel at the straight-ahead position.
b. Remove the 2 bolts and sliding yoke from the steering intermediate shaft.
Fig. 34: Removing Bolts And Sliding Yoke

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
33.REMOVE FRONT DISC BRAKE CYLINDER ASSY RH (See OVERHAUL
)
34.REMOVE DISC BRAKE CYLINDER ASSY LH (See OVERHAUL
)
35.REMOVE FRONT SUSPENSION UPPER ARM ASSY RH (See REPLACEMENT
)
36.REMOVE FRONT SUSPENSION UPPER ARM ASSY LH (See REPLACEMENT
)
37.REMOVE PNEUMATIC FRONT RH W/ SHOCK ABSORBER CYLINDER ASSY (See
REPLACEMENT
)
38.REMOVE PNEUMATIC FRONT LH W/ SHOCK ABSORBER CYLINDER ASSY (See
REPLACEMENT
)
39.REMOVE HEIGHT CONTROL SENSOR LINK SUB-ASSY FRONT (See REPLACEMENT
)
40.REMOVE STABILIZER BRACKET FRONT (See REPLACEMENT
)
41.DISCONNECT POWER STEERING GEAR HOUSING ASSY
a. Remove the bolt, and disconnect the 2 PS oil tubes from the front frame.
b. Remove the 4 bolts, and disconnect the PS gear housing from the front frame.

Fig. 41: Identifying VSV Connector For ACIS
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
i. Remove the 4 bolts, and disconnect the engine wire protector (LH side) from the upper intake
manifold and camshaft bearing cap.
j. Disconnect the 2 wire clamps on the engine wire (RH side) from the brackets on the RH delivery
pipe.
k. Remove the 2 bolts, and disconnect the engine wire protector (rear side) from the rear water bypass
joint and RH cylinder head.

Fig. 42: Disconnecting Engine Wire Protector (LH Side) From Upper Intake Manifold
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
l. Disconnect the 8 injector connectors.
m. Remove the 6 bolts, 4 nuts, intake manifold assy and 2 gaskets.
Fig. 43: Identifying Bolts

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
52.INSPECT INTAKE MANIFOLD ASSY
a. Upper intake manifold:
Using a precision straight edge and feeler gauge, measure the surface contacting the cylinder head
for warpage.
Maximum warpage: 0.15 mm (0.0059 in.)

Fig. 50: Measuring Surface Cylinder Head
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
73.REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO.2
74.REMOVE EXHAUST MANIFOLD SUB-ASSY LH
a. Remove the 8 nuts, exhaust manifold and
gasket.

140.INSTALL ENGINE UNDER COVER NO.2
141.INSTALL ENGINE UNDER COVER NO.1
142.INSTALL FRONT WHEEL
143.INSTALL AIR CLEANER ASSY
144.INSTALL INTAKE AIR CONNECTOR PIPE
145.INSTALL AIR CLEANER INLET NO.1
146.INSTALL V-BANK COVER
147.INSTALL HOOD SUB-ASSY (See ADJUSTMENT
and OVERHAUL )
148.CONNECT BATTERY NEGATIVE TERMINAL
149.ADD AUTOMATIC TRANSMISSION FLUID
150.ADD ENGINE COOLANT (See REPLACEMENT
)
151.ADD ENGINE OIL (See ON
-VEHICLE INSPECTION )
152.ADD POWER STEERING FLUID
153.BLEED POWER STEERING FLUID
154.INSPECT AUTOMATIC TRANSMISSION FLUID (See ADJUSTMENT
)
155.INSPECT ENGINE OIL LEAKS
156.CHECK FOR ENGINE COOLANT LEAKS
157.INSPECT FOR FUEL LEAKS
158.CHECK FOR EXHAUST GAS LEAKS
159.INSPECT AND ADJUST FRONT WHEEL ALIGNMENT
160.INSPECT IGNITION TIMING
161.INSPECT ENGINE IDLE SPEED
162.INSPECT CO/HC
163.ADJUST ENGINE (See INSPECTION
)
164.CHECK ABS SPEED SENSOR SIGNAL (See TEST MODE PROCEDURE
)
OVERHAUL
1.REMOVE SPARK PLUG
2.REMOVE OIL FILLER CAP SUB-ASSY
3.REMOVE CYLINDER HEAD COVER SUB-ASSY LH
a. Remove the 9 bolts, 9 seal washers, cylinder head cover and gasket.
4.REMOVE CYLINDER HEAD COVER SUB-ASSY
a. Remove the 9 bolts, 9 seal washers, c
ylinder head cover and gasket.

Fig. 104: Removing Bearing Cap Bolts
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
26.REMOVE SEMICIRCULAR PLUG
27.REMOVE TIMING BELT PLATE RR RH NO.2
a. Remove the 2 bolts and timing belt plate.
28.REMOVE TIMING BELT PLATE RR RH
a. Remove the bolt, stud bolt and timing belt plate.
29.REMOVE TIMING BELT PLATE RR LH NO.2
a. Remove the 2 bolts and timing belt plate.
30.REMOVE TIMING BELT PLATE RR LH
a. Remove the bolt and timing belt plate.
31.REMOVE CYLINDER HEAD SUB-ASSY
a. Uniformly loosen the 10 cylinder head bolts on one side of each cylinder head in several passes in
the sequence shown in the illustration.

Fig. 106: Identifying Cylinder Head Bolt Into Portion A
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Lift the cylinder head from the dowels on the cylinder block, and place the cylinder head on
wooden blocks on a bench.
HINT:
If the cylinder head cannot be removed, pry between the cylinder head and cylinder block with a
screwdriver.