2003 LEXUS LS430 Identifying ac

Fig. 277: Identifying Cylinder Head Sub-Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
17.INSTALL CYLINDER HEAD GASKET
a.Place a new cylinder head gasket in position on the cylinder block.
b. The rear side of the cylinder head gasket has marks so that the RH and LH banks can be
distinguished. A "3R" mark is on the RH bank's gasket.

Fig. 279: Identifying Painted Mark
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Install and uniformly tighten the 10 cylinder head bolts, and plate washers in the sequence shown in
the illustration.
Torque: 59 N.m (602 kgf.cm, 44 ft.lbf)

Fig. 290: Identifying Cylinder Head Bolts
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Uniformly loosen and remove the 10 cylinder head bolts and plate washers in the sequence shown
in the illustration.
e. Remove the cylinder head together with the LH manifold.
16.REMOVE CYLINDER HEAD GASKET NO.2

Fig. 292: Identifying Cylinder Head LH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 295: Identifying Painted Mark
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
i. Install the gasket to the cylinder head cover.
j. Install the seal washer to the bolt.
k. Install the cylinder head cover with the 9 bolts. Uniformly tighten the bolts in several passes.
Torque: 6.0 N.m (61 kgf.cm, 53 in..lbf)
l. Install the hose bracket of the EVAP to the cylinder head cover.
m. Install the wire clamp to the bracket on the cylinder head cover.
19.INSTALL W/CATALYST CONVERTER ASSY
20.INSTALL WATER BYPASS JOINT FR
a. Install 2 new gaskets and the water bypass joint with the 4 nuts. Alternately tighten the nuts.
Torque: 18 N.m (184 kgf.cm, 13 ft.lbf)
b. Connect the ECT connector.

Fig. 312: Identifying Cylinder Head Assy Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OVERHAUL
1.REMOVE VALVE LIFTER
a. Remove the valve lifter and adjusting shim.
HINT:
Arrange the valve lifters and shims in correct order.
2.REMOVE INTAKE VALVE
a. Using SST, compress the compression spring and remove the 2 keepers.
SST 09202-70020 (09202-01010)
b. Remove the spring retainer, compression spring, valve and spring seat.

Fig. 346: Identifying Specification Clearance Using Reamer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Using a sharp 5.5 mm reamer, ream the guide bush to obtain the standard specified clearance (see
step 9) between the guide bush and valve stem.

Different the bushes are used for the intake and exhaust.
Bush length: 40.5 mm (1.594 in.)
Fig. 348: Identifying Intake And Exhaust Bush Dimension

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Gradually heat the cylinder head to approximately 80 to 100 °C (176 to 212°F).
d. Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
SST 09201-01055 (09951-07100), 09950-70010
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