Lexus ES300 (1997 year). Service manual — part 464

P12816

Front

Recessed Heat Bolt

8 mm Hexagon Wrench

P12735

7

8

5

6

3

4

1

2

7

8

5

6

3

4

1

2

12 Pointed Head Bolt

Front

P12424

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–37

774

1997 LEXUS ES300 (RM511U)

34.

REMOVE CYLINDER HEADS

(a)

Using an 8 mm hexagon wrench, remove the cylinder
head (recessed head) bolt on each cylinder head, then re-
peat for the other side, as shown.

(b)

Uniformly loosen and remove the 8 cylinder head (12
pointed head) bolts on each cylinder head, in several
passes, in the sequence shown, then repeat for the other
side, as shown. Remove the 16 cylinder head bolts and
plate washers.

NOTICE:
Head warpage or cracking could result from removing
bolts in an incorrect order.

(c)

Lift the cylinder head from the dowels on the cylinder
block and place the 2 cylinder heads on wooden blocks
on a bench.

HINT:
If the cylinder head is difficult to lift off, pry between the cylinder
head and cylinder block with a screwdriver.
NOTICE:
Be careful not to damage the contact surfaces of the cylin-
der head and cylinder block.

EM044–02

P12683

P12476

SST

P12686

P12720

Magnetic Finger

EM–38

–

ENGINE MECHANICAL

CYLINDER HEAD

775

1997 LEXUS ES300 (RM511U)

DISASSEMBLY

1.

REMOVE VALVE LIFTERS AND SHIMS

HINT:
Arrange the valve lifters and shims in the correct order.

2.

REMOVE VALVES

(a)

Using SST, compress the valve spring and remove the 2
keepers.
SST

09202–70020 (09202–00010)

(b)

Remove these parts:

Spring retainer

Valve spring

Valve

(c)

Using needle–nose pliers, remove the oil seal.

(d)

Using compressed air and a magnetic finger, remove the
spring seat by blowing air.

HINT:
Arrange the valves, valve springs, spring seats and spring re-
tainers in the correct order.

EM045–02

P12689

P12492

P12700

P12701

P12703

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–39

776

1997 LEXUS ES300 (RM511U)

INSPECTION

1.

CLEAN TOP SURFACES OF PISTONS AND
CYLINDER BLOCK

(a)

Turn the crankshaft, and bring each piston to top dead
center (TDC). Using a gasket scraper, remove all the car-
bon from the piston top surface.

(b)

Using a gasket scraper, remove all the gasket material
from the cylinder block surface.

(c)

Using compressed air, blow carbon and oil from the bolt
holes.

CAUTION:
Protect your eyes when using high pressure compressed
air.

2.

REMOVE GASKET MATERIAL

Using a gasket scraper, remove all the gasket material from the
cylinder block contact surface.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.

3.

CLEAN COMBUSTION CHAMBERS

Using a wire brush, remove all the carbon from the combustion
chambers.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.

4.

CLEAN CYLINDER HEADS

Using a soft brush and solvent, thoroughly clean the cylinder
head.

P12755

P12733

P12702

EM0580

EM–40

–

ENGINE MECHANICAL

CYLINDER HEAD

777

1997 LEXUS ES300 (RM511U)

5.

CLEAN VALVE GUIDE BUSHINGS

Using a valve guide bushing brush and solvent, clean all the
guide bushings.

6.

INSPECT FOR FLATNESS

Using a precision straight edge and feeler gauge, measure the
surfaces contacting the cylinder block and the manifolds for
warpage.

Maximum warpage: 0.10 mm (0.0039 in.)

If warpage is greater than maximum, replace the cylinder head.

7.

INSPECT FOR CRACKS

Using a dye penetrant, check the combustion chamber, intake
ports, exhaust ports and cylinder block surface for cracks.
If cracked, replace the cylinder head.

8.

CLEAN VALVES

(a)

Using a gasket scraper, chip off any carbon from the valve
head.

(b)

Using a wire brush, thoroughly clean the valve.