LEXUS LS430 2003 Factory Repair Manual

Fig. 90: Turning Camshaft Timing Pulley Counterclockwise Using SST
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
16.INSPECT TIMING BELT
If there are any defects, as shown in the illustrations, check these points:
a. Premature parting
1. Check for proper installation.
2. Check the timing cover gasket for damage and proper installation.
b. If the belt teeth are cracked or damaged, check to see if either camshaft is locked.

Fig. 91: Checking Timing Belt
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. If there is noticeable wear or cracks on the belt face, check to see if there are nicks on the side of
the idler pulley lock and water pump.
d. If there is wear or damage on only one side of the belt, check the belt guide and the alignment of
each pulley.
e. If there is noticeable wear on the belt teeth, check the timing cover for damage, check that the
gasket has been installed correctly, and check for foreign material on the pulley teeth.
If necessary, replace the timing belt.
17.INSPECT TIMING BELT TENSIONER
a. Visually check the seal portion of the tensioner for oil leakage.
HINT:
If there is only the faint trace of oil on the push rod, the tensioner does not need to be replaced.
If leaka
ge is found, replace the tensioner.

Fig. 92: Identifying Seal Portion
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Hold the tensioner with both hands and push the push rod strongly as shown to check that it does
not move.
If the push rod moves, replace the tensioner.

Fig. 93: Pushing Push Rod
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Measure the protrusion of the push rod from the housing end.
Protrusion: 9.5 to 10.5 mm (0.374 to 0.413 in.)
If the protrusion is not as specified, replace the tensioner.

Fig. 94: Measuring Protrusion Of Push Rod From Housing End
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
18.REMOVE TIMING BELT IDLER SUB-ASSY NO.1
a. Using a 10 mm hexagon wrench, remove the bolt, idler and plate washer.
19.REMOVE TIMING BELT IDLER SUB-ASSY NO.2
a. Remove the bolt and idler.
20.INSPECT TIMING BELT IDLER SUB-ASSY NO.1
a. Visually check the seal portion of the idler for oil leakage.
If leakage is found, replace the idler.
b. Check that the idler turns smoothly.
If necessar
y, replace the idler.

Fig. 95: Checking Seal Portion Of Idler For Oil Leakage
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
21.REMOVE CRANKSHAFT TIMING PULLEY
a. Using SST, remove the timing pulley.
SST 09950-50013 (09951-05010, 09952-05010, 09953-05010, 09953-05020, 09954-05010)

Fig. 96: Removing Crankshaft Timing Pulley Using SST
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
22.REMOVE CAMSHAFT TIMING PULLEY
a. Remove the 4 bolts and timin
g pulley.

Fig. 97: Removing Camshaft Timing Pulley Using SST
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
23.REMOVE CAMSHAFT TIMING PULLEY SUB-ASSY LH
a. Remove the 4 bolts and timing pulley.
24.REMOVE CAMSHAFT

Fig. 98: Removing Bolts And Timing Pulley
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Remove the camshafts of the RH bank.
1. Bring the service bolt hole of the sub gear upward by turning the hexagon wrench head portion of
the No. 2 camshaft with a wrench.
2. Secure the sub gear to the main gear with a service bolt.
RECOMMENDED SERVICE BOLT:
RECOMMENDED SERVICE BOLT
HINT:
When removing the camshafts, make sure that the torsional spring force of the sub gear has been
eliminated b
y the above operation.
Thread diameter6 mm
Thread pitch1.0 mm
Bolt length16 to 20 mm (0.63 to 0.79 in.)

Fig. 99: Removing Camshafts Of RH Bank
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Set the timing mark (1 dot mark) of the camshaft main gear at approximately 10° angle by turning
the hexa
gon wrench head portion of the No. 2 camshaft with a wrench.