Inspection [08/2013 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.

INSPECT NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY

Turn the roller by hand to check that it turns smoothly.

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If the roller does not turn smoothly, replace the No. 1 valve rocker arm sub-assembly.

INSPECT VALVE LASH ADJUSTER ASSEMBLY

NOTE:

Keep the valve lash adjuster assembly free from dirt and foreign matter.
Only use clean engine oil.

Place the valve lash adjuster assembly into a container full of new engine oil.

Insert the tip of SST into the plunger and use the tip to press down on the check ball inside the plunger.

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*1	Plunger	*2	Check Ball
*3	Low Pressure Chamber	*4	High Pressure Chamber
*a	Correct	*b	Incorrect
*c	Taper Part	-	-

SST: 09276-75010

Squeeze SST and the valve lash adjuster assembly together to move the plunger up and down 5 to 6 times.
Check the movement of the plunger and bleed the air.
OK

Plunger moves up and down.

NOTE:
When bleeding air from the high-pressure chamber, make sure that the tip of SST is actually pressing the check ball as shown in the illustration. If the check ball is not pressed, air will not bleed.
After bleeding the air, remove SST. Then try to quickly and firmly press the plunger with your fingers.
OK

Plunger is very difficult to move.

If the result is not as specified, replace the valve lash adjuster assembly.

INSPECT CYLINDER HEAD SUB-ASSEMBLY FOR FLATNESS

Using a precision straightedge and feeler gauge, check the surfaces which contact the cylinder block sub-assembly and manifold for warpage.

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*a	Cylinder Block Side
*b	Intake Manifold Side
*c	Exhaust Manifold Side

Maximum Warpage

Item	Specified Condition
Cylinder block side	0.05 mm (0.00197 in.)
Intake manifold side	0.10 mm (0.00394 in.)
Exhaust manifold side	0.10 mm (0.00394 in.)

If the warpage is more than the maximum, replace the cylinder head sub-assembly.

INSPECT CYLINDER HEAD SUB-ASSEMBLY FOR CRACKS

Using a dye penetrant, check the intake ports, exhaust ports and cylinder surface for cracks.

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If cracked, replace the cylinder head sub-assembly.

INSPECT VALVE SEATS

Apply a light coat of Prussian blue to the valve face.

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Width

Lightly press the valve face against the valve seat.
HINT:

Do not rotate the valve while pressing the valve.
Check the valve face and valve seat.
1. Intake Side:
  Check that the contact surfaces of the valve seat and valve face are in the middle area of their respective surfaces, with the width between 1.0 and 1.4 mm (0.0433 and 0.0551 in.).
  
  If not, resurface the valve seat.
2. Exhaust Side:
  Check that the contact surfaces of the valve seat and valve face are in the middle area of their respective surfaces, with the width between 1.0 and 1.4 mm (0.0433 and 0.0551 in.).
  
  If not, resurface the valve seat.
3. Check that the contact surfaces of the valve seat and valve face are even around the entire valve seat.
  If not, resurface the valve seat.

INSPECT CAMSHAFT THRUST CLEARANCE

Install the camshaft housing sub-assembly.
Refer to INSTALLATION [08/2013 - ]

HINT:

Do not use seal packing when installing the camshaft housing sub-assembly, as the installation is temporary.

Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

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Standard Thrust Clearance

0.06 to 0.155 mm (0.00236 to 0.00610 in.)

Maximum Thrust Clearance

0.17 mm (0.00669 in.)

If the thrust clearance is more than the maximum, replace the camshaft housing sub-assembly.

INSPECT INNER COMPRESSION SPRING

HINT:

Type A and Type B can be distinguished by the shape of the inner compression spring.

Type	Inner Compression Spring Shape
A	Straight
B	Tapered

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*A	Type A
*B	Type B
*1	No. 1 Valve Rocker Arm Sub-assembly
*2	Valve Spring Retainer
*3	Inner Compression Spring
*4	Valve Lash Adjuster Assembly

Type A:

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

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Standard Free Length

52.90 mm (2.08 in.) or 53.87 mm (2.12 in.)

NOTE:

Inner compression springs come in 2 different lengths. Make sure all inner compression springs are the same length when replacing them.

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

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

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Maximum Deviation

1.0 mm (0.0394 in.)

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

Type B:

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

Standard Free Length

51.88 mm (2.04 in.) or 51.98 mm (2.05 in.)

NOTE:

Inner compression springs come in 2 different lengths. Make sure all inner compression springs are the same length when replacing them.

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

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

Maximum Deviation

1.3 mm (0.0512 in.)

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

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Deviation

INSPECT INTAKE VALVE

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

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*a	Overall length

Standard Overall Length

109.34 mm (4.30 in.)

Minimum Overall Length

108.84 mm (4.29 in.)

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

Using a micrometer, measure the diameter of the intake valve stem.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Valve Stem Diameter

5.470 to 5.485 mm (0.215 to 0.216 in.)

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

Using a vernier caliper, measure the intake valve head margin thickness.

*a	Margin thickness

Standard Margin Thickness

1.0 mm (0.0394 in.)

Minimum Margin Thickness

0.5 mm (0.0197 in.)

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

INSPECT EXHAUST VALVE

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

*a	Overall length

Standard Overall Length

108.25 mm (4.26 in.)

Minimum Overall Length

107.75 mm (4.24 in.)

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

Using a micrometer, measure the diameter of the exhaust valve stem.

Standard Valve Stem Diameter

5.465 to 5.480 mm (0.215 to 0.216 in.)

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

Using a vernier caliper, measure the exhaust valve head margin thickness.

*a	Margin thickness

Standard Margin Thickness

1.0 mm (0.0394 in.)

Minimum Margin Thickness

0.5 mm (0.0197 in.)

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

INSPECT VALVE GUIDE BUSH OIL CLEARANCE

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.)

Subtract the valve stem diameter measurement from the valve guide bush inside diameter measurement.

Standard Oil Clearance

Item	Specified Condition
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.)

Maximum Oil Clearance

Item	Specified Condition
Intake	0.080 mm (0.00315 in.)
Exhaust	0.085 mm (0.00335 in.)

If the clearance is more than the maximum, replace the valve and valve guide bush.