Altima 2.5 SL L4-2.5L (QR25DE) (2002)
33.
Install the new Heat Shield Support Bracket using six new screws (see Figure E23b).
NOTE:
For Sentra: Remove the lower Oxygen Sensor at this time. This will provide additional clearance needed when installing the Manifold/Catalyst in the
vehicle (covered later in this procedure).
Install New Heat Shield on New Exhaust Manifold/Catalyst:
IMPORTANT:
^ Use suitable hand protection when handling the Exhaust Manifold/Catalyst heat shields.
^ Be careful NOT to damage the Oxygen sensors when performing this procedure.
34.
Remove three screws and remove the old Lower Front Heat Shield from the old manifold (see Figure E24).
^
IMPORTANT:
Use "penetrating" oil. Loosen screws 1/2 turn with hand-tool (do not use power tool) and apply penetrating oil before removing screws
completely.
^
Confirm there is no damage to the threads inside the mounting bosses.
^
If you break off a heat shield screw(s) in an Exhaust Manifold/Catalyst that is supposed to be re-used on the vehicle, perform Procedure G -
Install "Keen-Sert(s)" As Needed.
35.
Remove the old Oxygen Sensors from the old manifold (see Figure E24).
36.
Install the new Rear Heat Shield onto the new Exhaust Manifold/Catalyst with four new screws (see Figure E25a).