Lexus SC300 / Lexus SC400. Manual - part 371

16. IF NECESSARY, REPLACE SPARK PLUG TUBE

GASKETS

(a)  Bend the ventilation case claw installed on the cylinder head

cover to an angle of 90

 or more.

(b)  Using SST and a hammer, tap out the gasket.

SST 09550–10012 (09552–10010, 09560–10010)

(c) 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 09550–10012 (09552–10010, 09560–10010)

(d)  Apply a light coat of MP grease to the gasket lip.
(e)  Return the ventilation case claw to its original position.

CYLINDER HEAD ASSEMBLY

EG1KN–02

(See Components for Removal and Installation)

HINT:

•

Thoroughly clean all parts to be assembled.

•

Before installing the parts, apply new engine oil to all
sliding and rotating surfaces.

•

Replace all gaskets and oil seals with new ones.

1. 

INSTALL SPARK PLUG TUBES
HINT: When using a new cylinder head, 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 48.7 – 49.3 mm (1.917 – 1.941) protruding from
the camshaft bearing cap installation surface of the cylinder
head.
NOTICE: Avoid tapping a new spark plug tube in too far
by measuring the amount of the protrusion while tap-
ping.

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ENGINE MECHANICAL

EG–107

2. INSTALL 

VALVES

(a)  Using SST, push in a new oil seal.

SST 09201–41020

(b)  Install the following parts:

(1) Valve
(2) Spring 

seat

(3) Valve 

spring

(4) Spring 

retainer

(c)  Using SST, compress the valve spring and place the 2

keepers around the valve stem.
SST 09202–70010

(d)  Using a plastic–faced hammer, lightly tap the valve stem tip

to assure proper fit.

3. 

INSTALL VALVE LIFTERS AND SHIMS

(a)  Install the valve lifter and shim.
(b)  Check that the valve lifter rotates smoothly by hand.

EG–108

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ENGINE MECHANICAL

CYLINDER HEADS INSTALLATION

EG22V–02

(See Components for Removal and Installation)
1.  INSTALL RH EXHAUST MANIFOLD TO RH CYLINDER

HEAD

(a)  Place a new gasket on the cylinder head with the white

painted marks facing the manifold side.
NOTICE: Be careful of the Installation direction.

(b) Install 

the 

exhaust manifold with 8 new nuts. Uniformly

tighten the nuts in several passes.

Torque: 44 N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

(c)  Install the main heated oxygen sensor.

Torque: 44 N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

(d)  Install the heat insulator with the 3 bolts.

2.  INSTALL LH EXHAUST MANIFOLD TO LH CYLINDER

HEAD

(a)  Place a new gasket on the cylinder head with the white

painted marks facing the manifold side.
NOTICE: Be careful of the installation direction.

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ENGINE MECHANICAL

EG–109

(b)  Install the exhaust manifold with 8 new nuts. Uniformly

tighten the nuts in several passes.

Torque: 44 N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

(c)  Install the main heated oxygen sensor.

Torque: 44 N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

(d)  Install the heat insulator with the 3 bolts.

3. 

INSTALL CYLINDER HEADS

A.

Place cylinder head on cylinder block

(a)  Place 2 new cylinder head gaskets in position on the cylinder

block.
HINT: On the rear side of the cylinder head gasket are
painted marks to distinguish the LH and RH banks, a white
painted mark for the RH bank and a yellow painted mark for
the LH bank.

NOTICE: Be careful of the installation direction.

(b)  Place the 2 cylinder heads in position on the cylinder head

gaskets.

EG–110

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ENGINE MECHANICAL