Checking Injector Valves For Leaks and Cleaning

Checking Injector Valves For Leaks And Cleaning

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







Checking injector valves for leaks:
Clip injector valves into special tool 13 6 205.







Connect special tool 13 6 206 to the injector valves.







Connect special tool 13 6 206 to a 12 V car battery.
This removes the remaining fuel from the injector valves.
Lay a clean cloth under injector valves to catch remaining fuel.
Connect special tool 13 6 205 to compressed air connection (max. 3 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).
Regulate air pressure at connection (1) on special tool 13 6 205 to 3 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 injector valves from water and dry well with compressed air.







Cleaning 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!
To remove preserving agent, rinse new injector valves with fuel only after approx. 5 minutes. Install injector valves in engine and operate engine.


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.