Frontier 2WD L4-2.5L (QR25DE) (2005)
1. Measure the camshaft cam height with a micrometer.
Standard:
Intake : 45.015 - 45.205 mm (1.7722 - 1.7797 inch)
Exhaust : 43.975 - 44.165 mm (1.7313 - 1.7388 inch)
Cam wear limit : 0.2 mm (0.008 inch)
2. If wear is beyond the limit, replace camshaft.
Camshaft Journal Oil Clearance
CAMSHAFT JOURNAL DIAMETER
Measure the outer diameter of camshaft journal with a micrometer.
Standard:
No.1 : 27.935 - 27.955 mm (1.0998 - 1.1006 inch)
No.2, 3, 4, 5 : 23.435 - 23.455 mm (0.9226 - 0.9234 inch)
CAMSHAFT BRACKET INNER DIAMETER
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Tighten camshaft bracket bolts with the specified torque. Refer to INSTALLATION for the tightening procedure.
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Measure inner diameter A of camshaft bracket with a bore gauge.
Standard:
No.1 : 28.000 - 28.021 mm (1.1024 - 1.1032 inch)
No. 2, 3, 4, 5 : 23.500 - 23.521 mm (0.9252 - 0.9260 inch)
CAMSHAFT JOURNAL OIL CLEARANCE
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(Oil clearance) = (Camshaft bracket inner diameter) - (Camshaft journal diameter)
Standard : 0.045 - 0.086 mm (0.0018 - 0.0034 inch)
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If out of the standard, replace either or both camshaft and cylinder head.
NOTE: Camshaft brackets cannot be replaced as single parts, because they are machined together with cylinder head. Replace whole cylinder
head assembly.
Camshaft End Play