Toyota Venza: Inspection

Toyota Venza Service Manual / 1ar-fe Engine Mechanical / Cylinder Head / Inspection

INSPECTION

PROCEDURE

1. INSPECT CYLINDER HEAD SUB-ASSEMBLY

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

Maximum Warpage:

Item	Specified Condition
Cylinder head lower 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.

Text in Illustration

*1	Cylinder Head Lower Side:
*2	Intake Manifold Side:
*3	Exhaust Manifold Side:

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

If cracked, replace the cylinder head.

2. INSPECT COMPRESSION SPRING

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

Standard free length:

50.0 mm (1.97 in.)

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

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

Text in Illustration

Deviation

Maximum deviation:

1.0 mm (0.0394 in.)

Maximum angle:

2°

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

3. INSPECT INTAKE VALVE

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

Standard valve stem diameter:

5.470 mm to 5.485 mm (0.2154 to 0.2159 in.)

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

Text in Illustration

*1	Margin Thickness

Standard margin thickness:

1.0 mm (0.0394 in.)

Minimum margin thickness:

0.50 mm (0.0197 in.)

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

Text in Illustration

*1	Overall Length

Standard overall length:

103.92 mm (4.09 in.)

Minimum overall length:

103.42 mm (4.07 in.)

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

4. INSPECT EXHAUST VALVE

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

Standard valve stem diameter:

5.465 mm to 5.480 mm (0.2152 to 0.2157 in.)

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

Text in Illustration

*1	Margin Thickness

Standard margin thickness:

1.0 mm (0.0394 in.)

Minimum margin thickness:

0.50 mm (0.0197 in.)

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

Text in Illustration

*1	Overall Length

Standard overall length:

112.91 mm (4.44 in.)

Minimum overall length:

112.41 mm (4.43 in.)

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

5. INSPECT VALVE GUIDE BUSH OIL CLEARANCE

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

Standard bush inside diameter:

5.510 to 5.530 mm (0.2169 to 0.2177 in.)

(b) 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	0.08 mm (0.00315 in.)
Exhaust	0.10 mm (0.00394 in.)

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

6. INSPECT INTAKE VALVE SEAT

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

(b) Lightly press the valve face against the valve seat.

Text in Illustration

Width

HINT:

Do not rotate the valve while pressing the valve.

(1) 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 1.1 and 1.5 mm (0.0433 and 0.0591 in.).

If not, correct the valve seat.

(2) 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.

7. INSPECT EXHAUST VALVE SEAT

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

(b) Lightly press the valve face against the valve seat.

Text in Illustration

Width

HINT:

Do not rotate the valve while pressing the valve.

(1) 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 1.1 and 1.5 mm (0.0433 and 0.0591 in.).

If not, correct the valve seat.

(2) 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.

8. INSPECT CAMSHAFT OIL CLEARANCE

NOTICE:

Do not turn the camshafts.

(a) Clean the bearing caps, camshaft housing and camshaft journals.

(b) Place the camshafts on the camshaft housing.

Text in Illustration

*1	Plastigage

(d) Install the camshaft bearing caps (See page ).

(e) Install the camshaft housing sub-assembly (See page ).

(f) Remove the camshaft bearing caps (See page ).

(g) Measure the Plastigage at its widest point.

Standard Oil Clearance:

Item	Specified Condition
Intake No. 1 journal	0.035 to 0.072 mm (0.00137 to 0.00283 in.)
Exhaust No. 1 journal	0.049 to 0.086 mm (0.00193 to 0.00339 in.)
Other journal	0.025 to 0.062 mm (0.000984 to 0.00244 in.)

Maximum Oil Clearance:

Item	Specified Condition
Intake No. 1 journal	0.085 mm (0.00335 in.)
Exhaust No. 1 journal	0.095 mm (0.00374 in.)
Other journal	0.085 mm (0.00335 in.)

If the oil clearance is more than the maximum, replace the camshaft. If necessary, replace the camshaft housing.

Text in Illustration

*1	Plastigage
*2	No. 1 Journal
*3	Other Journal

9. INSPECT CAMSHAFT THRUST CLEARANCE

(a) Inspect the intake camshaft.

(1) Install the intake camshaft.

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

If the thrust clearance is more than the maximum, replace the camshaft housing. If the thrust surface is damaged, replace the camshaft.

(b) Inspect the intake and exhaust camshafts.

(1) Install the intake and exhaust camshafts.

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

Standard thrust clearance:

0.060 to 0.155 mm (0.00236 to 0.00610 in.)

Maximum thrust clearance:

0.170 mm (0.00669 in.)

If the thrust clearance is more than the maximum, replace the camshaft housing. If the thrust surface is damaged, replace the camshaft.

Disassembly

DISASSEMBLY PROCEDURE 1. REMOVE INTAKE VALVE (a) Using SST and wooden blocks, compress the compression spring and remove the valve spring retainer locks. SST: 09202-70020 09202 ...

Replacement

REPLACEMENT PROCEDURE 1. REPLACE INTAKE VALVE GUIDE BUSH (a) Heat the cylinder head to approximately 80 to 100°C (176 to 212°F). (b) Place the cylinder head on wooden blocks. (c) Usi ...

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