Altima 2.5 SL L4-2.5L (QR25DE) (2002)
1. Install a dial gauge in the thrust direction on the front end of the camshaft. Measure the end play with the dial gauge while moving the camshaft
forward and backward (in direction to axis).
Standard end play: 0.115 - 0.188 mm (0.0045 - 0.0074 inch)
2. If out of the specified range, replace with new camshaft and measure again. If out of the specified range again, replace with new cylinder head
assembly.
Camshaft Sprocket Runout
1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket on the camshaft.
3. Measure camshaft sprocket runout while turning the camshaft by hand.
Runout: Less than 0.15 mm (0.0059 inch)
4. If it exceeds the specification, replace camshaft sprocket.
Valve Lifter
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Check if the surface of the valve lifter has any excessive wear or cracks, replace as necessary.
Valve Lifter Clearance
Outer Diameter of Valve Lifter
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Measure the outer diameter of the valve lifter.
Valve lifter outer diameter: 33.965 - 33.980 mm (1.3372 - 1.3378 inch)
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If out of the specified range, replace the valve lifter.