Toyota Sequoia (2005). Manual - part 661

A04082

A03209

A03201

12.3 to 12.7 mm

EM–54

–

ENGINE MECHANICAL

CYLINDER HEAD

2633

22.

INSPECT CAMSHAFT GEAR BACKLASH

(a)

Install the drive gear to the camshaft timing tube
(See page 

EM–58

).

(b)

Install the camshaft timing  tube to the intake camshaft
(See page 

EM–58

).

(c)

Install the camshafts without installing the exhaust cam-
shaft sub–gear and front bearing cap
(See page 

EM–58

).

(d)

Using a dial indicator, measure the backlash.
Standard backlash:
0.020 to 0.200 mm (0.0008 to 0.0079 in.)
Maximum backlash: 0.30 mm (0.0118 in.)

If the backlash is greater than the maximum, replace the intake
camshaft drive gear and exhaust camshaft.
(e)

Remove the camshafts.

(f)

Remove the camshaft timing tube from the intake cam-
shaft.

(g)

Remove the drive gear from the camshaft timing tube.

23.

INSPECT VALVE LIFTERS AND LIFTER BORES

(a)

Using a caliper gauge, measure the lifter bore diameter
of the cylinder head.
Lifter bore diameter:
31.000 to 31.016 mm (1.2205 to 1.2211 in.)

(b)

Using a micrometer, measure the lifter diameter at the
valve lifter center line, 12.3 to 12.7 mm (0.484 to 0.500 in.)
from the valve lifter head.
Lifter diameter:
30.968 to 30.976 mm (1.2192 to 1.2195 in.)

(c)

Subtract the lifter diameter measurement from the lifter
bore diameter measurement.
Standard oil clearance:
0.024 to 0.050 mm (0.0009 to 0.0020 in.)
Maximum oil clearance:
0.07 mm (0.0028 in.)

If the oil clearance is greater than the maximum, replace the lift-
er. If necessary, replace the cylinder head.

A23376

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–55

2634

24.

INSPECT EXHAUST MANIFOLDS

Using a precision straight edge and feeler gauge, measure the
warapage of the surface that is in contact with the cylinder
head.

Maximum warpage: 0.10 mm (0.0394 in.)

If warpage is greater than maximum, replace the manifold.

EM0L3–08

A03195

80 to 100

°

C

A05708

SST

A03197

Use STD

Bushing size

10.285 to 10.306

Bushing bore diameter

Both intake and exhaust

(0.4049 to 0.4057)

Use O/S STD

mm (in.)

(0.4069 to 0.4077)

10.335 to 10.356

P21844

34.5 mm
(1.358 in.)

40.5 mm
(1.594 in.)

Intake

Exhaust

EM–56

–

ENGINE MECHANICAL

CYLINDER HEAD

2635

REPLACEMENT

1.

REPLACE VALVE GUIDE BUSHINGS

(a)

Gradually heat the cylinder head to 80 to 100

°

C (176 to

212

°

F).

(b)

Using SST and a hammer, tap out the guide bushing.
SST

09201–01055, 09950–70010 (09951–07100)

(c)

Using a caliper gauge, measure the bushing bore diame-
ter of the cylinder head.

(d)

Select a new guide bushing (STD or O/S 0.05).

If the bushing bore diameter of the cylinder head is greater than
10.306 mm (0.4057 in.), machine the bushing bore to the fol-
lowing dimension:

10.335 to 10.356 mm (0.4069 to 0.4077 in.)

If the bushing bore diameter of the cylinder head is greater than
10.356 mm (0.4077 in.), replace the cylinder head.

HINT:
Different the bushings are used for the intake and exhaust.
(e)

Gradually heat the cylinder head to 80 to 100

°

C (176 to

212

°

F).

A05709

SST

A03199

A03200

Sharp 5.5 mm Reamer

A04107

Pry

Claw

Bend

A04108

SST

SST

Return

Claw

Downward

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–57

2636

(f)

Using SST and a hammer, tap in a new guide bushing to
the specified protrusion height.
Protrusion height:

Intake

9.2 to 9.8 mm (0.362 to 0.386 in.)

Exhaust

8.2 to 8.8 mm (0.323 to 0.346 in.)

SST

09201–01055,  09950–70010 (09951–07100)

(g)

Using a sharp 5.5  mm reamer, ream the guide bushing
to obtain the standard specified clearance (see page

EM–46

) between the guide bushing and valve stem.

2.

REPLACE SPARK PLUG TUBE GASKETS

(a)

Bend the 4 ventilation case claws installed on the cylinder
head cover to an angle of 90

°

 or more.

(b)

Using a screwdriver, pry out the gasket.

NOTICE:
Be careful not to damage the cylinder head cover. Tape the
screwdriver tip.

(c)

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

09950–60010  (09951–00240, 09951–00440,
09952–06010), 09950–70010 (09951–07100)

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

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

(e)

Return the 4 ventilation case claws to its original position.