QX56 AWD V8-5.6L (VK56DE) (2005)
Intake: 0.020 - 0.053 mm (0.0008 - 0.0021 inches)
Exhaust: 0.030 - 0.063 mm (0.0012 - 0.0025 inches)
Limit
Intake: 0.08 mm (0.0031 inches)
Exhaust: 0.09 mm (0.0035 inches)
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If the calculated value exceeds the limit, replace valve and/or valve guide. When the valve guide must be replaced, refer to "VALVE GUIDE
REPLACEMENT".
VALVE GUIDE REPLACEMENT
When the valve guide is removed, replace it with an oversized (0.2 mm, 0.008 inches) valve guide.
1. To remove the valve guide, heat the cylinder head to 110° to 130°C (230° to 266°F) by soaking it in heated oil.
2. Remove the valve guide using suitable tool.
CAUTION: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
3. Ream the cylinder head valve guide hole using suitable tool.
Valve guide hole diameter:
Standard
Intake and exhaust: 9.975 - 9.996 mm (0.3927 - 0.3935 inches)
Oversize (service)
Intake and exhaust: 10.175 - 10.196 mm (0.4006 - 0.4014 inches)