Altima 2.5 SL L4-2.5L (QR25DE) (2002)
7. Loosen the nuts in the sequence shown, on the exhaust manifold and three way catalyst.
8. Remove the exhaust manifold and three way catalyst assembly and gasket. Discard the gasket.
INSPECTION AFTER REMOVAL
Surface Distortion
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Use a reliable straightedge and feeler gauge to check the flatness of exhaust manifold fitting surface.
Standard: 0.3 mm (0.012 inch)
INSTALLATION
Installation in the reverse order of removal. Pay attention to the following:
Tightening Exhaust Manifold Nuts
Exhaust Manifold Sequence
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Tighten the nuts in the numerical order shown, to specification. After tightening No.5, retighten No.1 and then No.3 to specification.
Installation of Heated Oxygen Sensors
Clean the heated oxygen sensor threads with the Tool, then apply the anti-seize lubricant to the threads before installing the heated oxygen sensors.
CAUTION: Do not over-tighten the heated oxygen sensors. Doing so may cause damage to the heated oxygen sensors, resulting in a malfunction and
the MIL coming on.