Cylinder Head Inspection

Using a precision straightedge and feeler gauge, measure the warpage of the contact surfaces where the cylinder head contacts the cylinder block and manifolds.

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.)

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

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

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 (0.0394 and 0.0551 in.).
   If not, correct 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 (0.0394 and 0.0551 in.).
   If not, correct 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, correct the valve seat.
   

Install the camshaft housing assembly (RAV4_ACA30 RM0000027I905UX_03_0374.html).

HINT:

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

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

Standard thrust clearance:

0.06 to 0.155 mm (0.00236 to 0.00610 in.)

Maximum thrust clearance:

0.17 mm (0.00669 in.)

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

Standard free length:

53.36 mm (2.10 in.)

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

Maximum deviation:

1.0 mm (0.0394 in.)

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

Standard overall length:

109.34 mm (4.30 in.)

Minimum overall length:

108.84 mm (4.29 in.)

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

Valve stem diameter:

5.470 to 5.485 mm (0.215 to 0.216 in.)

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.)

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

Standard overall length:

108.25 mm (4.26 in.)

Minimum overall length:

107.75 mm (4.24 in.)

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

Valve stem diameter:

5.465 to 5.480 mm (0.215 to 0.216 in.)

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.)

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

Standard bush inside diameter:

5.510 to 5.530 mm (0.217 to 0.218 in.)

Subtract the valve stem diameter measurement from the 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.)