INSPECTION CAUTION / NOTICE / HINT
HINT:
- Use the same procedure for bank 1 and bank 2.
- The following procedure is for bank 2.
PROCEDURE 1. INSPECT CYLINDER HEAD LH (a)
Using a precision straightedge and feeler gauge, check the surfaces
which contact the cylinder block sub-assembly and manifolds for warpage.
|
*a | Bottom Side |
*b | Intake Manifold Side | |
*c | Exhaust Manifold Side |
- | - |
Standard Warpage: |
Item | Specified Condition | |
Bottom Side | 0.05 mm (0.00197 in.) | |
Intake Manifold Side |
0.08 mm (0.00315 in.) | |
Exhaust Manifold Side |
0.08 mm (0.00315 in.) | Maximum Warpage: |
Item | Specified Condition | |
Bottom Side | 0.10 mm (0.00394 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 LH.
2. INSPECT CYLINDER HEAD LH FOR CRACKS
| (a) Using a dye penetrant, check the intake ports, exhaust ports and bottom surface of the cylinder head LH for cracks.
HINT: If cracks are found, replace the cylinder head LH. |
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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. |
|
| (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 intake valve. |
|
| (c) Using a vernier caliper, measure the overall length of the intake valve.
Standard Overall Length: 105.85 mm (4.17 in.) Minimum Overall Length:
105.35 mm (4.15 in.) HINT: 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 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. |
|
| (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. |
|
| (c) Using a vernier caliper, measure the overall length of the exhaust valve.
Standard Overall Length: 110.40 mm (4.35 in.) Minimum Overall Length:
109.90 mm (4.33 in.) HINT: If the overall length is less than the minimum, replace the exhaust valve. |
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5. 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 intake 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: 1.1 to 1.5 mm (0.0433 to 0.0591 in.) |
|
6. 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 exhaust 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: 1.1 to 1.5 mm (0.0433 to 0.0591 in.) |
|
7. INSPECT INNER COMPRESSION SPRING
| (a) Using a vernier caliper, measure the free length of the inner compression spring.
Standard Free Length: 54.53 mm (2.15 in.) Minimum Free Length:
52.43 mm (2.06 in.) HINT: If the free length is not as specified, replace the inner compression spring. |
|
| (b) Using a steel square, measure the deviation of the inner compression spring.
Maximum Deviation (Reference): 1.4 mm (0.0551 in.) HINT:
If the deviation is more than the maximum, replace the inner compression spring. |
 |
|
*a | Deviation | |
*b | 40 mm (1.57 in.) | | |
8. 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: 5.510 to 5.530 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 | 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 | 0.12 mm (0.00472 in.) | |
Exhaust | 0.12 mm (0.00472 in.) |
HINT: If the oil clearance is more than the maximum, replace the valve and valve guide bush. |
