Altima L4-2.5L (QR25DE) Hybrid (2007)
7. Loosen the nuts in the opposite sequence as 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.
Limit: 0.3 mm (0.012 in)
INSTALLATION
Installation is in the reverse order of removal. Pay attention to the following.
Tightening Exhaust Manifold Nuts
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Tighten the nuts in the numerical order shown, to specification.
Installation of A/F Sensors and Heated Oxygen Sensors
Clean the A/F sensor and heated oxygen sensor threads with the Tool, then apply the anti-seize lubricant to the threads before installing the A/F sensor
and heated oxygen sensors.
Tool number
: J-43897-18
: J-43897-12
CAUTION: Do not over-tighten the A/F sensors and heated oxygen sensors. Doing so may cause damage to the A/F sensors and heated
oxygen sensors, resulting in a malfunction and the MIL coming on.