Lexus ES: Inspection

*a

Bottom Side

*b

Intake Manifold Side

*c

Exhaust Manifold Side

-

-

Bottom Side

0.05 mm (0.00197 in.)

Intake Manifold Side

0.08 mm (0.00315 in.)

Exhaust Manifold Side

0.08 mm (0.00315 in.)

Bottom Side

0.10 mm (0.00394 in.)

Intake Manifold Side

0.10 mm (0.00394 in.)

Exhaust Manifold Side

0.10 mm (0.00394 in.)

(a) Using a dye penetrant, check the intake ports, exhaust ports and bottom surface of the cylinder head LH for cracks.

HINT:

If cracks are found, replace the cylinder head LH.

(a) Using a micrometer, measure the diameter of the valve stem.

Standard Valve Stem Diameter:

5.470 to 5.485 mm (0.215 to 0.216 in.)

HINT:

If the valve stem diameter is not as specified, check the intake valve guide bush oil clearance.

(b) Using a vernier caliper, measure the valve head margin thickness.

Standard Margin Thickness:

1.0 mm (0.0394 in.)

Minimum Margin Thickness:

0.5 mm (0.0197 in.)

HINT:

If the margin thickness is less than the minimum, replace the intake valve.

(c) Using a vernier caliper, measure the overall length of the intake valve.

Standard Overall Length:

105.85 mm (4.17 in.)

Minimum Overall Length:

105.35 mm (4.15 in.)

HINT:

If the overall length is less than the minimum, replace the intake valve.

(a) Using a micrometer, measure the diameter of the valve stem.

Standard Valve Stem Diameter:

5.465 to 5.480 mm (0.215 to 0.216 in.)

HINT:

If the valve stem diameter is not as specified, check the exhaust valve guide bush oil clearance.

(b) Using a vernier caliper, measure the valve head margin thickness.

Standard Margin Thickness:

1.0 mm (0.0394 in.)

Minimum Margin Thickness:

0.5 mm (0.0197 in.)

HINT:

If the margin thickness is less than the minimum, replace the exhaust valve.

(c) Using a vernier caliper, measure the overall length of the exhaust valve.

Standard Overall Length:

110.40 mm (4.35 in.)

Minimum Overall Length:

109.90 mm (4.33 in.)

HINT:

If the overall length is less than the minimum, replace the exhaust valve.

(c) Check the valve face and intake valve seat by using the following procedure:

(1) If Prussian blue appears 360° around the entire intake valve face, the valve face is concentric.

HINT:

If the valve face is not concentric, replace the intake valve.

(2) If Prussian blue appears 360° around the entire intake valve seat, the intake valve seat and valve face are concentric.

HINT:

If the valve face is not concentric, resurface the intake valve seat.

(3) Measure the width of the contact area of the intake valve seat and valve face.

Standard Width:

1.1 to 1.5 mm (0.0433 to 0.0591 in.)

(c) Check the valve face and exhaust valve seat by using the following procedure:

(1) If Prussian blue appears 360° around the entire exhaust valve face, the valve face is concentric.

HINT:

If the valve face is not concentric, replace the exhaust valve.

(2) If Prussian blue appears 360° around the entire exhaust valve seat, the exhaust valve seat and valve face are concentric.

HINT:

If the valve face is not concentric, resurface the exhaust valve seat.

(3) Measure the width of the contact area of the exhaust valve seat and valve face.

Standard Width:

1.1 to 1.5 mm (0.0433 to 0.0591 in.)

(a) Using a vernier caliper, measure the free length of the inner compression spring.

Standard Free Length:

54.53 mm (2.15 in.)

Minimum Free Length:

52.43 mm (2.06 in.)

HINT:

If the free length is not as specified, replace the inner compression spring.

(b) Using a steel square, measure the deviation of the inner compression spring.

Maximum Deviation (Reference):

1.4 mm (0.0551 in.)

HINT:

If the deviation is more than the maximum, replace the inner compression spring.

(a) Using a caliper gauge, measure the inside diameter of the valve guide bush.

Standard Valve Guide Bush Inside Diameter:

5.510 to 5.530 mm (0.217 to 0.218 in.)

Intake

0.025 to 0.060 mm (0.000984 to 0.00236 in.)

Exhaust

0.030 to 0.065 mm (0.00118 to 0.00256 in.)

Intake

0.12 mm (0.00472 in.)

Exhaust

0.12 mm (0.00472 in.)