Exhaust System: Service and Repair

EXHAUST SYSTEM
Removal and Installation
Refer to the following figures for removal and installation.





QG18DE





QR25DE

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.
^ 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 inch) 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.