Checking For Air Leakage In the Exhaust System

Checking for air leakage in the exhaust system

Special tools:
999 5544 REGULATOR 999 5544 Regulator
999 7085 Adapter 999 7085 Adapter

Note! The illustrations in this service information are used for different model years and / or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Removing components





Remove:
- the nut where the three-way catalytic converter (TWC) and exhaust system separate
Note! Use rust solvent or similar on the nuts.

the gasket. Separate the exhaust system from the three-way catalytic converter (TWC).

Installing tool





Install:
- The tool (1) 999 7085 Adapter 999 7085 Adapter using a new gasket
- pressure regulator 999 5544 REGULATOR 999 5544 Regulator on tool 999 7085 Adapter 999 7085 Adapter. Adjust the pressure to 0.4 bar .

Cleaning and checking

Check
Check the exhaust system by spraying a soap solution on all joints and connections between the cylinder head and the rear heated oxygen sensor (HO2S). Only very small and slow bubbles are permissible.

Finishing

Removing tools

Remove:
- pressure regulator 999 5544 REGULATOR 999 5544 Regulator
- tool 999 7085 Adapter 999 7085 Adapter.

Installing components

Install:
- a new gasket where the exhaust system and three-way catalytic converter (TWC) divide
- a new nut for the exhaust system. Tighten.
Start the engine. Check for leaks where the three-way catalytic converter (TWC) and the exhaust system divide.