Toyota Yaris: 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 sub-assembly contacts the cylinder block sub-assembly, intake manifold and exhaust manifold.
| *a | Bottom Side | *b | Intake Manifold Side |
| *c | Exhaust Manifold Side | - | - |
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.
| (b) Using a dye penetrant, check the intake ports, exhaust ports and cylinder head sub-assembly surface for cracks. HINT: If cracks are found, replace the cylinder head sub-assembly. |
|
2. INSPECT COMPRESSION SPRING
(a) Intake Side:
| (1) Using a vernier caliper, measure the free length of the compression spring. Standard Free Length: 57.70 mm (2.27 in.) NOTICE: Compression springs come in 2 different lengths. Make sure all compression springs are the same length when replacing them. |
|
| (2) Using a steel square, measure the deviation of the compression spring. Maximum Deviation (Reference): 1.0 mm (0.0394 in.) HINT: If the deviation is more than the maximum, replace the compression spring. |
|
(b) Exhaust Side:
| (1) Using a vernier caliper, measure the free length of the compression spring. Standard Free Length: 59.11 mm (2.33 in.) NOTICE: Compression springs come in 2 different lengths. Make sure all compression springs are the same length when replacing them. |
|
| (2) Using a steel square, measure the deviation of the compression spring. Maximum Deviation (Reference): 1.0 mm (0.0394 in.) HINT: If the deviation is more than the maximum, replace the compression spring. |
|
3. INSPECT INTAKE VALVE
| (a) 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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| (b) Using a vernier caliper, measure the valve head margin thickness. Standard Margin Thickness: 1.23 to 1.25 mm (0.0484 to 0.0492 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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| (c) Using a vernier caliper, measure the overall length of the intake valve. Standard Overall Length: 102.45 mm (4.03 in.) Minimum Overall Length: 101.95 mm (4.01 in.) HINT: If the overall length is less than the minimum, replace the intake valve. |
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4. INSPECT EXHAUST VALVE
| (a) 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 exhaust valve guide bush oil clearance. |
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| (b) 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. |
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| (c) Using a vernier caliper, measure the overall length of the exhaust valve. Standard Overall Length: 117.05 mm (4.608 in.) Minimum Overall Length: 116.55 mm (4.59 in.) HINT: If the overall length is less than the minimum, replace the exhaust valve. |
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5. INSPECT VALVE GUIDE BUSH OIL CLEARANCE
| (a) Using a caliper gauge, measure the inside diameter of the valve guide bush. Standard Valve Guide Bush Inside Diameter: 5.51 to 5.53 mm (0.217 to 0.218 in.) |
|
(b) Subtract the valve stem diameter measurement from the valve guide bush inside diameter measurement.
Standard Oil Clearance:
| Item | Specified Condition |
|---|---|
| Intake Side | 0.025 to 0.060 mm (0.000984 to 0.00236 in.) |
| Exhaust Side | 0.030 to 0.065 mm (0.00118 to 0.00256 in.) |
Maximum Oil Clearance:
| Item | Specified Condition |
|---|---|
| Intake Side | 0.080 mm (0.00315 in.) |
| Exhaust Side | 0.10 mm (0.00394 in.) |
HINT:
- Oil clearance = Valve guide bush inside - Valve stem diameter
- If the oil clearance is more than the maximum, replace the valve and valve 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 intake valve seat. NOTICE: Do not rotate the valve while pressing it. |
|
(c) Check the valve face and intake valve seat by using the following procedure:
(1) If Prussian blue appears 360° around the entire intake valve face, the valve face is concentric.
HINT:
If the valve face is not concentric, replace the intake valve.
(2) If Prussian blue appears 360° around the entire intake valve seat, the intake valve seat and valve face are concentric.
HINT:
If the valve face is not concentric, resurface the intake valve seat.
(3) Measure the width of the contact area of the intake valve seat and valve face.
Standard Width:
1.0 to 1.4 mm (0.0394 to 0.0551 in.)
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 exhaust valve seat. NOTICE: Do not rotate the valve while pressing it. |
|
(c) Check the valve face and exhaust valve seat by using the following procedure:
(1) If Prussian blue appears 360° around the entire exhaust valve face, the valve face is concentric.
HINT:
If the valve face is not concentric, replace the exhaust valve.
(2) If Prussian blue appears 360° around the entire exhaust valve seat, the exhaust valve seat and valve face are concentric.
HINT:
If the valve face is not concentric, resurface the exhaust valve seat.
(3) Measure the width of the contact area of the exhaust valve seat and valve face.
Standard Width:
1.3 to 1.7 mm (0.0512 to 0.0669 in.)
8. INSPECT CAMSHAFT THRUST CLEARANCE
(a) Clean the No. 1 camshaft bearing cap, No. 2 camshaft bearing cap, 2 No. 3 camshaft bearing caps, No. 4 camshaft bearing cap, camshaft journals.
(b) Place the intake camshaft sub-assembly and exhaust camshaft sub-assembly on the cylinder head sub-assembly.
(c) Install the camshaft bearing caps.
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| (d) Using a dial indicator, measure the thrust clearance while moving the intake camshaft sub-assembly and exhaust camshaft sub-assembly back and forth. Standard Thrust Clearance:
Maximum Thrust Clearance:
HINT: If the thrust clearance is more than the maximum, replace the cylinder head sub-assembly. If the thrust surface is damaged, replace the camshaft. |
|
Disassembly
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