Cylinder Head Inspection

Using a precision straight edge and a feeler gauge, measure the surfaces contacting the cylinder block and the manifolds for warpage.

Maximum Warpage:

Item	Specified Condition
Cylinder block side	0.05 mm (0.0020 in.)
Intake manifold side	0.10 mm (0.0039 in.)
Exhaust manifold side	0.10 mm (0.0039 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.

Check the valve face and valve seat according to the following procedure:

1. If Prussian blue appears 360° around the valve face, the valve face is concentric. If not, replace the valve.
   

2. If Prussian blue appears 360° around the valve seat, the guide and valve face are concentric. If not, resurface the valve seat.
   

3. Check that the valve seat contact is in the middle of the valve face with the valve seat width between 1.0 and 1.4 mm (Intake side (0.039 to 0.055 in.)).
   

4. Check that the valve seat contact is in the middle of the valve face with the valve seat width between 1.0 and 1.4 mm (Exhaust side (0.039 to 0.055 in.)).
   

Install the camshafts (COROLLA_ZRE142 RM0000027I90ANX.html).

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

Standard Thrust Clearance:

Item	Specified Condition
Intake	0.06 to 0.155 mm (0.0024 to 0.0061 in.)
Exhaust	0.06 to 0.155 mm (0.0024 to 0.0061 in.)

Maximum Thrust Clearance:

Item	Specified Condition
Intake	0.17 mm (0.0067 in.)
Exhaust	0.17 mm (0.0067 in.)

Clean the bearing caps and camshaft journals.

Place the camshafts on the camshaft housing.

Lay a strip of Plastigage across each of the camshaft journals.

Install the bearing caps (COROLLA_ZRE142 RM0000027I90ANX.html).

NOTICE:

Do not turn the camshaft.

Remove the bearing caps (COROLLA_ZRE142 RM0000027IB0ABX.html).

Measure the Plastigage at its widest point.

Standard Oil Clearance:

Item	Specified Condition
Camshaft No. 1 journal	0.030 to 0.063 mm (0.0012 to 0.0025 in.)
Camshaft other journals	0.035 to 0.072 mm (0.0014 to 0.0028 in.)

Maximum Oil Clearance:

Item	Specified Condition
Camshaft No. 1 journal	0.085 mm (0.0033 in.)
Camshaft other journals	0.09 mm (0.0035 in.)

NOTICE:

Completely remove the Plastigage after the inspection.

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

Free length:

53.36 mm (2.1008 in.) or 53.87 mm (2.1209 in.)

NOTICE:

Compression springs come in 2 different sizes. Make sure both compression springs are the same size when replacing them.

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

Maximum deviation:

1.0 mm (0.0394 in.)

Using a gasket scraper and wire brush, scrape off any carbon on the intake valve head.

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

Standard overall length:

109.34 mm (4.3047 in.)

Minimum overall length:

108.84 mm (4.2850 in.)

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

Valve stem diameter:

5.470 to 5.485 mm (0.2154 to 0.2159 in.)

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

Standard margin thickness:

1.0 mm (0.0394 in.)

Minimum margin thickness:

0.5 mm (0.0197 in.)

Using a gasket scraper and wire brush, scrape off any carbon on the exhaust valve head.

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

Standard overall length:

108.25 mm (4.2618 in.)

Minimum overall length:

107.75 mm (4.2421 in.)

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

Valve stem diameter:

5.465 to 5.480 mm (0.2152 to 0.2157 in.)

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

Standard margin thickness:

1.01 mm (0.0398 in.)

Minimum margin thickness:

0.5 mm (0.0197 in.)

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

Bushing inside diameter:

5.510 to 5.530 mm (0.2169 to 0.2177 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 (0.0010 to 0.0024 in.)
Exhaust	0.030 to 0.065 mm (0.0012 to 0.0026 in.)

Maximum Oil Clearance:

Item	Specified Condition
Intake	0.080 mm (0.0031 in.)
Exhaust	0.085 mm (0.0033 in.)