8ZR-FXE ENGINE MECHANICAL  CYLINDER HEAD  INSPECTION  

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*a	Bottom Side
*b	Intake Manifold Side
*c	Exhaust Manifold Side

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

Maximum Warpage:

Item	Specified Condition
Bottom 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.)

HINT:

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

Using a dye penetrant, check the intake ports, exhaust ports and bottom surface of the cylinder head sub-assembly for cracks.

HINT:

If cracks are found, replace the cylinder head sub-assembly.

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*a	Overall Length

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

Standard Overall Length:

109.34 mm (4.30 in.)

Minimum Overall Length:

108.84 mm (4.29 in.)

HINT:

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

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.

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*a	Margin Thickness

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.

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*a	Overall Length

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

Standard Overall Length:

108.25 mm (4.26 in.)

Minimum Overall Length:

107.75 mm (4.24 in.)

HINT:

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

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.

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE MECHANICAL)>CYLINDER HEAD>INSPECTION201906,999999,_51,_080726,_0391621,RM100000001HLGK_01_0049,

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*a	Margin Thickness

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.

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

Standard Free Length:

58.52 mm (2.30 in.)

NOTICE:

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

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*a	Angle
*b	40 mm (1.57 in.)

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

Maximum Angle (Reference):

2°

HINT:

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

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.)

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*a

Width

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