Component Tests and General Diagnostics

Checking Injector Valves For Leaks And Cleaning

Special tools required:
- 13 6 200
- 13 6 205
- 13 6 206
- 13 6 207

Injector valves removed.
Mark sequence of injector valves relative to cylinders on each injector valve.


CAUTION: Observe country-specific safety regulations when handling fuels and cleaning agents.


Recycling:
Note national regulations.

Check injector valves for leaks:







Clip fuel injectors into special tool 13 6 205







Connect special tool 13 6 206 to the injector valves.







To catch remaining fuel, wrap fuel injectors in clean cleaning cloth.
Connect special tool 13 6 206 to a 12 V car battery. This removes the remaining fuel from the injector valves. Connect special tool 13 6 205 to compressed air connection of max. 5 bar.
Residual fuel is now blown out of the injector valves.


CAUTION: Carry out leak test only after remaining fuel has been blown out of injector valves.







Separate special tool 13 6 206 from the injector valves.
Install injector valves with special tool 13 6 205 in a container with hot water (60... 80 °C).
Adjust air pressure at connection (1) on special tool 13 6 205 to max. 3 bar (motorsport models max. 5 bar).
Note volume of air emerging.
Permitted volume of air emerging: 2 air bubbles per injector valve within a 15 second period.
Note injector valves with larger volumes of air emerging.

Injector valves with larger amounts of air emerging must be cleaned.
Remove fuel injectors from water and dry thoroughly with compressed air.

Clean injector valves:







Install injector valves in special tool 13 6 205
Connect special tool 13 6 206 to injector valves and to a 12 V car battery.







Use ultrasonic cleaning unit 13 6 200 to clean injector valves.
Read operating instructions before operating ultrasonic cleaning unit.







Attach injector valves to special tool 13 6 200 with special tool 13 6 205
Fill special tool 13 6 200 with cleaning concentrate 13 6 207 as specified by manufacturer.
Perform cleaning procedure as specified by manufacturer.
Repeat leak test on cleaned injector valves.


CAUTION:
Do not carry out leak test in cleaning concentrate but rather in a water bath.
Only replace injector valves from which volume of air emerging exceeds the permitted limit of 2 bubbles within a 15 second period.


CAUTION:
Install cleaned injector valves immediately in engine and run engine.
This flushes out any remaining cleaning concentrate thereby preventing injector valve corrosion.
Due to the risk of corrosion, cleaned injector valves can no longer be stored.