2003 LEXUS LS430 Spark plug

Fig. 112: Prying Out Gasket Using Screwdriver
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
41.INSTALL SPARK PLUG TUBE GASKET
a. Using SST and a hammer, tap in a new gasket until its surface is flush with the upper edge of the
cylinder head cover.
SST 09950-60010, 09950-70010 (09951-00240, 09951-00440, 09951-07100, 09952-06010)
b. Apply a light coat of MP grease to the gasket lip.
c. Return the 4 ventilation case claws to its ori
ginal position.

Fig. 113: Installing Spark Plug Tube Gasket Using SST
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
42.REMOVE CAMSHAFT TIMING TUBE ASSY
a. Mount the hexagon wrench head portion of the camshaft in a vise.

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87.INSTALL OIL FILLER CAP SUB-ASSY
88.INSTALL SPARK PLUG
REPLACEMENT
1.DISCONNECT BATTERY NEGATIVE TERMINAL
2.REMOVE AIR CLEANER INLET NO.1
3.DRAIN ENGINE COOLANT
4.REMOVE V-BANK COVER
5.REMOVE INTAKE AIR CONNECTOR PIPE
6.REMOVE ENGINE UNDER COVER NO.1
7.DISCONNECT RADIATOR HOSE NO.1
8.DISCONNECT RADIATOR HOSE NO.2
9.DISCONNECT OIL COOLER INLET TUBE NO.1
10.DISCONNECT OIL COOLER OUTLET TUBE NO.1
11.REMOVE AIR CLEANER ASSY
12.REMOVE RADIATOR ASSY (See REPLACEMENT

13.REMOVE FAN AND GENERATOR V BELT (See REPLACEMENT
)
14.REMOVE VANE PUMP ASSY
a. Remove the 2 bolts, nut and pump.
HINT:
Pump should be removed with the hoses connected and then hang with a rope or wire on the body's side.
15.REMOVE GENERATOR ASSY (See REPLACEMENT
)
16.DISCONNECT COMPRESSOR AND MAGNETIC CLUTCH
HINT:
The cooler compressor with the magnetic clutch should be removed with the low-pressure and high-
pressure hoses connected and then hang with a rope or wire on the body's side.
17.REMOVE TIMING CHAIN OR BELT COVER NO.2
a. Disconnect the 2 PS air hoses from the clamp on the cover.
b. Remove the cap nut, 3 bolts, cover and gasket.

Fig. 395: Measuring Thread Outside Diameter Of Bolt Using Vernier Caliper
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21.INSTALL SPARK PLUG TUBE
HINT:When using a new cylinder head, the spark plug tubes must be installed.
a. Apply adhesive to the end of the spark plug tube.
Adhesive: Part No. 08833-00070, THREE BOND 1324 or equivalent
b. Using a wooden block and hammer, tap in a new spark tube until there is 48.4 to 49.6 mm (1.906 to

1.953 in.) protruding from the camshaft bearing cap installation surface of the cylinder head.
Fig. 396: Applying Adhesive To End Of Spark Plug Tube

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Fig. 397: Taping Spark Tube Using Wooden Block And Hammer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
22.INSTALL TIGHT PLUG NO.1
a. Apply adhesive to the end of the spark plug tube.
Adhesive: Part No. 08833-00070, THREE BOND 1324 or equivalent
b. Using SST and a hammer, tap in a new tight plug as shown in the illustration.
SST 09950-60010 (09951-00200), 09950-70010 (09951-07100)

Fig. 3: Ignition System Diagram (2 Of 2)
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ON-VEHICLE INSPECTION
1.INSPECT IGNITION COIL ASSY (WITH IGNITER) AND PERFORM SPARK TEST
a. Check for DTCs.
b. Check if sparks occur.
1. Remove the ignition coil (see REPLACEMENT
).
2. Remove the spark plug.
3. Install the spark plug to the ignition coil, and connect the ignition coil connector.
4. Disconnect the 8 injector connectors.
5. Ground the spark plu
g.

6. Visually check if spark occurs while the engine is being cranked.
If a spark does not occur, perform the test as follows:
Fig. 4: Spark Test Flow Diagram

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7. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 18 N.m (180 kgf.cm, 13 ft.lbf)
8. Install the ignition coils (see REPLACEMENT
).