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Home >> Infiniti >> 2003 >> Q45 V8-4.5L (VK45DE) >> Repair and Diagnosis >> Specifications >> Mechanical Specifications >> Engine >> Camshaft, Engine
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Camshaft, Engine






INSPECTION AFTER REMOVAL
Camshaft Runout





1. Put V block on precise flat bed, and support No.2 and No.5 journal of camshaft.
2. Set dial gauge vertically to No.3 journal.
3. Turn camshaft to one direction with hands, and measure camshaft runout on dial gauge.
^ 1/2 of runout is bend.
Standard: Less than 0.02 mm (0.0008 inch)

4. If it exceeds the specification, replace camshaft.

Camshaft Cam Height





1. Measure camshaft cam height.
Standard cam height:
Intake: 44.865 - 45.055 mm (1.7663 - 1.7738 inch)
Exhaust: 43.925 - 44.115 mm (1.7293 - 1.7368 inch)
2. If wear is beyond the specifications, replace camshaft.

Camshaft Journal Clearance
Outer Diameter of Camshaft Journal





Measure outer diameter of camshaft journal.
Standard outer diameter:
No.1: 25.938 - 25.955 mm (1.0212 - 1.0218 inch)
No.2, 3, 4, 5: 25.953 - 25.970 mm (1.0218 - 1.0224 inch)

Inner Diameter of Camshaft Bracket





^ Tighten camshaft bracket bolt with specified torque.
^ 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) = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal)
Standard:
No. 1: 0.045 - 0.083 mm (0.0018 - 0.0033 inch)
No.2, 3, 4, 5: 0.030 - 0.068 mm (0.0012 - 0.0027 inch)
^ When out of the specified range above, replace either or both camshaft and cylinder head.

NOTICE: Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder head assembly.

Camshaft End Play





^ 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)
^ When out of the specified range, replace with new camshaft and measure again.
^ When out of the specified range again, replace with new cylinder head.

Camshaft Sprocket Runout





1. Install camshaft in cylinder head.
2. Install camshaft sprocket to camshaft.
3. Measure camshaft sprocket runout.
Runout: Less than 0.15 mm (0.0059 inch)
4. If it exceeds the specifications, replace camshaft sprocket.

Valve Lifter and Adjusting Shim





Check if surface of valve lifter and adjusting shim has any wear or cracks.

Valve Lifter Clearance
Outer Diameter of Valve Lifter





Measure outer diameter of valve lifter.
Standard: 33.965 - 33.975 mm (1.3372 - 1.3376 inch)

Valve Lifter Hole Diameter





Using inside micrometer, measure diameter of valve lifter hole of cylinder head.
Standard: 34.000 - 34.016 mm (1.3386 - 1.3392 inch)

Calculation of Valve Lifter
Clearance (Valve lifter clearance) = (hole diameter of valve lifter) - (outer diameter of valve lifter)
Standard: 0.025 - 0.051 mm (0.0010 - 0.0020 inch)
^ When out of specified range, referring to each specification of outer and inner diameter, replace either or both valve lifter and cylinder head.

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