Lexus LS400 (2000 year). Manual — part 92

EM09U–02

P08885

Adhesive

15 mm (0.59 in.)

A03212

Protrusion

A03213

SST

A03214

EM–56

–

ENGINE MECHANICAL

CYLINDER HEAD

1238

REASSEMBLY

HINT:

Thoroughly clean all parts to be assembled.

Before installing the parts, apply new engine oil to all slid-
ing 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 48.4 – 49.6 mm (1.906 – 1.953 in.) pro-
truding from the camshaft bearing cap installation surface
of the cylinder head.

NOTICE:
Avoid tapping a new spark plug tube in too far by measur-
ing the amount of the protrusion while tapping.

2.

INSTALL VALVES

(a)

Using SST, push in a new oil seal.
SST

09201–41020

(b)

Install the valve.

(c)

Install the spring seat.

(d)

Install the valve spring.

(e)

Install the spring retainer.

A03191

SST

A04277

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–57

1239

(f)

Using SST, compress the valve spring and place the 2
keepers around the valve stem.
SST

09202–70020

(g)

Using a plastic–faced hammer and the valve stem (not in
use) tip wound with vinyl tape, lightly tap the valve stem
tip to assure proper fit.

NOTICE:
Be careful not to damage the valve stem tip.
3.

INSTALL SHIMS AND VALVE LIFTERS

(a)

Install the shim and valve lifter.

(b)

Check that the valve lifter rotates smoothly by hand.

A02885

White
Painted
Mark

EM108–01

A02883

A02886

White Painted Mark

A02884

EM–58

–

ENGINE MECHANICAL

CYLINDER HEAD

1240

INSTALLATION

1.

INSTALL RH EXHAUST MANIFOLD TO 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, 32 ft·lbf)

(c)

Install the heat insulator with the 3 bolts.

2.

INSTALL LH EXHAUST MANIFOLD TO 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, 32 ft·lbf)

(c)

Install the heat insulator with the 3 bolts.

A02887

RH Cylinder Block

LH Cylinder Block

A02870

RH Cylinder Head

LH Cylinder Head

Front

1

7

9

4

6

5

3

10

8

2

1

7

9

6

5

3

10

8

2

1

4

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–59

1241

3.

PLACE CYLINDER HEAD ON CYLINDER BLOCK

(a)

Place 2 new cylinder head gaskets in position on the cylin-
der block.

HINT:
On the rear side of the cylinder head gasket are marks to distin-
guish the LH and RH banks, a ”R” mark for the RH bank and a
”L” 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.

4.

INSTALL CYLINDER HEAD BOLTS

HINT:

The cylinder head bolts are tightened in 2 progressive
steps (steps (c) and (e)).

If any cylinder head bolt is broken or deformed, replace
it.

(a)

Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.

(b)

Install the plate washer to the cylinder head bolt.

(c)

Install and uniformly tighten the 10 cylinder head bolts on
one side of the cylinder head in several passes in the se-
quence shown, then do the other side as shown.
Torque: 39 N·m (400 kgf·cm, 29 ft·lbf)

If any one of the cylinder head bolts does not meet the torque
specification, replace the cylinder head bolt.