Intake Manifold: Testing and Inspection

WM 244601 Checking intake-air distributor on 4.8-litre DFI engines

Tools






Checking intake-air distributor

Checking intake system for leaks =>
1. Fit the stoppers 9264/7 on the two air cleaner connections and push in the securing clips. => Stoppers on intake pipe





Stoppers on intake pipe

WARNING

Danger of damaging the intake system if pressure is too high.

- Intake system can burst.
- Danger of injury from flying components.

-> Do not subject intake system to excessive air pressure (max. 1.2 bar of absolute pressure).

2. Set compressed-air reducer to 0.2 bar (approx. 1.2 bar absolute pressure).
3. Push a compressed-air hose onto the connection from the stopper 9264/7 and connect the other end to the compressed-air reducer.
4. Spray the intake system systematically with a leak-locating spray. Bubbles can be seen clearly at the locations where there are leaks (e.g. -arrow- ).





View shows a leaking Y pipe

5. Seal defective areas.
6. If you suspect that the intake pipe is defective, check that the vacuum line is connected correctly to the intake-air distributor. => Vacuum line It is also important to check that the seals are positioned correctly with respect to the cylinder head. For details, see also -> 244619 Removing and installing intake-air distributor on DFI engines 244619 Removing and installing DFI intake-air distributor





Vacuum line