Intake Manifold: Testing and Inspection

Checking The Intake-Air Distributor For Leaks

Tools







Preliminary work
1. Disassemble left and front centre engine compartment cover.
2. Disconnect connection on the air cleaner lid. To do this, turn the pins by 180 degrees and pull them out. Then pull off the intake pipe.







Tools and materials

Required tools







Leak test

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

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

NOTE:
The illustrations are from the V8, however, the locks and the procedure are identical.

Cylinders must not be located in the overlapping TDC. This happens only if the crankshaft was turned manually.

1. Connect the plug 9264/7 (with compressed-air connection) to the air cleaner connection and push in the safety bracket. Then connect a compressed-air hose to the connection on the plug.







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 on the plug 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.
5. Seal defective areas.
6. Remove special tool.

Subsequent work
1. Push the connections onto the cover of the air cleaner housing and mount and lock the fastening pins.







2. Fit engine compartment cover.