Checking For Air Leakage In the Exhaust System

CHECKING FOR AIR LEAKAGE IN THE EXHAUST SYSTEM

Special tools: 999 5544, 999 7085

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 using a new gasket pressure regulator 999 5544 on tool 999 7085.
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 tool 999 7085.

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 threeway catalytic converter (TWC) and the exhaust system divide.