Frontier 2WD L4-2.5L (QR25DE) (2005)
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Measure the following parts if out of the standard.
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Dimension A for camshaft No. 1 journal
Standard : 25.800 - 25.848 mm (1.0157 - 1.0176 inch)
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Dimension B for cylinder head No. 1 journal bearing
Standard : 25.660 - 25.685 mm (1.0102 - 1.0112 inch)
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Refer to the standards above, and then replace camshaft and/or cylinder head.
Camshaft Sprocket Runout
1. Put V-block on precise flat table, and support No. 2 and 5 journals of camshaft.
CAUTION: Do not support No.1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.
2. Measure the camshaft sprocket runout with a dial indicator.
(Total indicator reading)
Limit : 0.15 mm (0.0059 inch)
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If it exceeds the limit, replace camshaft sprocket.
Valve Lifter
Check if surface of valve lifter has any wear or cracks.
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If anything above is found, replace valve lifter. Refer to Valve Clearance.
Valve Lifter Clearance
VALVE LIFTER OUTER DIAMETER