Removal and Installation: Qr25DE

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Removal And Installation Of Exhaust System (QR25DE)

Courtesy of NISSAN MOTOR CO., U.S.A.

CAUTION:

Always replace the exhaust gaskets and seal bearings with new ones when reassembling.
For the QR25DE engine, install the two seal bearings as shown. Position the conical spring so that the wide end is against the flare flange as shown.

Fig 2: Installing Seal Bearings (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Installing Seal Bearings (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.
With engine running, check all tube connections for exhaust gas leaks, and entire system for unusual noises.
Check to ensure that mounting brackets and mounting insulators are installed properly and free from undue stress. Improper installation could result in excessive noise or vibration.
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; replace it with a new one.
Before installing a new heated oxygen sensor, clean the exhaust tube sensor threads (using oxygen sensor thread cleaner) Tool, J-43897-18 or J-43897-12, and apply anti-seize lubricant.
Do not over-tighten the heated oxygen sensor. Doing so may cause damage to the heated oxygen sensor, resulting in the MIL coming on.