Exhaust Manifold and Three Way Catalyst

EXHAUST MANIFOLD AND THREE WAY CATALYST






Removal and Installation
REMOVAL
1. Remove the engine undercover.
2. Disconnect the electrical connector of heated oxygen sensor 1 or air fuel ratio (A/F) sensor 1, and unhook the harness from the bracket and middle clamp on the cover.





3. Remove the heated oxygen sensor 1 or air fuel ratio (A/F) sensor 1 using Tool.
Tool numbers
Air fuel ratio sensor wrench (A/F): J44626
Heated oxygen sensor wrench: KV10117100 (J36471-A)

CAUTION:
^ Be careful not to damage heated oxygen sensor or air fuel ratio (A/F) sensor.
^ Discard any heated oxygen sensor or air fuel ratio (A/F) 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; use a new one.

4. Remove the lower exhaust manifold covers.
5. Remove the exhaust front tube.
6. Remove the upper exhaust manifold cover.





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





^ 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 is in the reverse order of removal.

Tightening Exhaust Manifold Nuts





^ 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 Sensor or Air Fuel Ratio (A/F) Sensor
Clean the sensor threads using Tool, then apply the anti-seize lubricant to the threads before installing. Refer to RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS.
Tool number: J43897-18, J43897-12

CAUTION: Do not over-tighten. Doing so may cause damage, resulting in a malfunction and the MIL coming on.