Lexus ES300 (1997 year). Manual - part 467

P12496

P13235

P13236

P13224

SST

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–49

786

1997 LEXUS ES300   (RM511U)

26.

INSPECT 12 POINTED HEAD CYLINDER HEAD
BOLTS

Using vernier calipers, measure the tension portion diameter of
the bolt.

Standard outside diameter:
8.95 – 9.05 mm (0.3524 – 0.3563 in.)
Minimum outside diameter: 8.75 mm (0.3445 in.)

If the diameter is less than minimum, replace the bolt.

27.

IF NECESSARY, REPLACE SPARK PLUG TUBE
GASKETS

(a)

Bend up the tab on the ventilation baffle plate which pre-
vents the gasket from the slipping out.

(b)

Using a screwdriver and hammer, tap out the gasket.

(c)

Using needle–nose pliers, pry out the gasket.

(d)

Using SST and a hammer, tap in a new gasket until its sur-
face is flush with the upper edge of the cylinder head cov-
er.
SST

09608–03071

(e)

Apply a light coat of MP grease to the gasket lip.

(f)

Return the ventilation plate tab to its original position.

EM046–02

P11511

10 – 15 mm (0.39 – 0.59 in.)

Adhesive

P12572

Protrusion

P12869

Flush

P12719

SST

EM–50

–

ENGINE MECHANICAL

CYLINDER HEAD

787

1997 LEXUS ES300   (RM511U)

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 press, press in a new spark plug tube until there
is 42.4 – 43.4 mm (1.669 – 1.709 in.) protruding from the
camshaft bearing cap installation surface of the cylinder
head.

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

2.

INSTALL PCV PIPES

HINT:
When using a new cylinder head, PCV pipe must be installed.
Using a wooden block and hammer, tap in a new PCV pipe until
its top side is flush with the cylinder head edge.
NOTICE:
Be careful not to damage the cylinder head edge.

3.

INSTALL VALVES

(a)

Using SST, push in a new oil seal.
SST

09201–41020

S05923

Intake

Exhaust

Mark

”NOK”

Light Brown Surface

Gray Surface

P12668

(4)

(3)

(2)

(1)

P12476

SST

P12687

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–51

788

1997 LEXUS ES300   (RM511U)

HINT:
The intake valve oil seal is light brown and the exhaust valve oil
seal is gray.
NOTICE:
Pay much attention when assembling the oil seal for intake
and exhaust. Assembling the wrong one may cause a fail-
ure.

(b)

Install these 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

09202–70020 (09202–00010)

(d)

Using a plastic–faced hammer, lightly tap the valve stem
tip to ensure a proper fit.

4.

INSTALL VALVE LIFTERS AND SHIMS

(a)

Install the valve lifter and shim.

(b)

Check that the valve lifter rotates smoothly by hand.

EM047–02

P12393

P12736

12 Pointed Head Bolt

Front

8

7

6

5

4

3

2

1

8

7

6

5

4

3

2

1

P25742

Painted Mark

Front

90

°

90

°

EM–52

–

ENGINE MECHANICAL

CYLINDER HEAD

789

1997 LEXUS ES300   (RM511U)

INSTALLATION

1.

PLACE CYLINDER HEAD ON CYLINDER BLOCK

(a)

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

NOTICE:
Be careful of the installation direction.
(b)

Place the 2 cylinder heads in position on the cylinder head
gaskets.

2.

INSTALL 12 POINTED HEAD CYLINDER HEAD BOLTS

HINT:

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

If any 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 cylinder head bolts on
each cylinder head, in several passes, in the sequence
shown, then repeat for the other side, as shown.
Torque: 54 N·m (550 kgf·cm, 40 ft·lbf)

If any of the cylinder head bolts does not meet the torque speci-
fication, replace the cylinder head bolt.

(d)

Mark the front of the cylinder head bolt head with paint.

(e)

Retighten the cylinder head bolts by 90

°

 in the numerical

order shown.

(f)

Check that the painted mark is now at a 90

°

 angle to the

front.