Intake Manifold: Testing and Inspection

Checking The Intake-Air Distributor For Leaks

Tools







Tools and materials

Required tools







Leak test

NOTE: The specified description can be used to check the intake system from the air cleaner outlet to the injection valves for leaks.







Cylinders must not be located in the overlapping TDC. This happens only if the crankshaft was turned manually.
1. Remove engine compartment cover.
2. Separate connections on the air cleaner covers. To do this, turn the pins by 180 degrees and pull them out. Then pull off the intake manifolds.







3. Connect the plugs 9264/7 to the two air cleaner connections and push in the securing clip.







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).

WARNING:
Danger of injury from flying components.
- Do not pull out the oil dipstick or open the engine during the test procedure.

4. Set compressed-air reducer to 0.2 bar (approx. 1.2 bar absolute pressure).
5. Push a compressed-air hose onto the connection from the plug 9264/7 and connect the other end to the pressure reducer.
6. 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-).







NOTE:
- Any leaks that exist between the air cleaner cover and the intake distributor seal can be located using this method.
- Proceed systematically with the check.

7. Seal defective areas.
8. Remove special tool.
9. Push the connections onto the cover of the air cleaner housing and mount and lock the fastening pins.







10. Fit engine compartment cover.