Specifications

Page 8
Section 4.1
Service Training
09.06
CHECKING FOR LEAKS
- Dry the nozzle and nozzle holder - blow dry with an air jet.
- Slowly press the tester hand lever down until a pressure approx. 20 bar under the previously obtained
opening pressure is reached.
- The nozzle does not leak if no drops of fuel show within 10 seconds.
If a drop of fuel leaks out, disassemble the injection valve and eliminate the leak by cleaning the injection
nozzle. If this does not remedy the leak, renew the injection valve.
Do not rework the valve.
BUZZING AND JET TEST
- Shut off the compression tester pressure gauge.
The buzzing test is an audible test for determining if the needle is moving easily in the nozzle body. New
injection nozzles have a different buzzing behaviour as opposed to used ones. Wear in the area of the
needle seat lets the buzzing behaviour deteriorate. A nozzle that does not buzz despite cleaning must be
replaced.
A used injection valve must buzz audibly if the hand lever is operated quickly and it must produce a finely
atomized spray. The shape of the spray can vary greatly from that of a new injection valve.
INSTALLING THE INJECTION NOZZLE
- Using some grease, slide the seal onto the injection valve.
- Insert the injection valve.
- Put the clamping shoe in place.
- Torque the screws to 16
+ 5
N.