QX56 V8-5.6L (VK56DE) (2004)
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Measure camshaft cam height.
Standard cam height (intake & exhaust): 44.465 - 44.655 mm (1.7506 - 1.7581 inch)
Cam wear limit (intake & exhaust): 0.02 mm (0.0008 inch)
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If wear is not within the specifications, replace camshaft.
Camshaft Journal Clearance
Camshaft Journal Diameter
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Measure diameter of camshaft journal.
Standard diameter : 25.953 - 25.970 mm (1.0218 - 1.0224 inch)
Camshaft Bracket Inner Diameter
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Tighten camshaft bracket bolt with specified torque.
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Using inside micrometer, measure inner diameter of camshaft bracket.
Standard : 26.000 - 26.021 mm (1.0236 - 1.0244 inch)
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) - (camshaft journal diameter)
Standard : 0.030 - 0.068 mm (0.0012 - 0.0027 inch)
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When out of the specified range above, replace either or both camshaft and cylinder head.
NOTE: Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder head assembly.
Camshaft End Play
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Install dial gauge in thrust direction on front end of camshaft. Measure end play when camshaft is moved forward/backward (in direction to axis).
Standard : 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
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When out of the specified range, replace with new camshaft and measure again.
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When out of the specified range again, replace with new cylinder head.