Altima 2.5 SL L4-2.5L (QR25DE) (2002)
Valve Lifter Hole Diameter
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Using inside micrometer, measure diameter of valve lifter hole of cylinder head.
Standard: 34.000 - 34.021 mm (1.3386 - 1.3394 inch)
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If out of the specified range, replace the cylinder head assembly.
Calculation of Valve Lifter Clearance
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(Valve lifter clearance) = (hole diameter for valve lifter) - (outer diameter of valve lifter)
Standard: 0.020 - 0.056 mm (0.0008 - 0.0022 inch)
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If out of specified range, replace either or both valve lifter and cylinder head assembly.
INSTALLATION
1. Install the valve lifter.
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Install them in the same position from which they were removed.
2. Install the camshafts.
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The distinction between the intake and exhaust camshafts is in a difference of shapes of the back end:
Intake: Signal plate for the camshaft position sensor (PHASE)
Exhaust: Cone end shape
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Install camshafts so that the dowel pins on the front side are positioned as shown.
3. Install camshaft brackets.
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Install by referring to identification mark on upper surface mark.