B3.9 and B5.9 Series Engines
Section 6 - Injectors and Fuel Lines - Group 06
While testing the injectors, keep hands and body parts
away from the injector nozzle. Fuel coming from the
injector is under extreme pressure and can cause se-
rious injury by penetrating the skin.
Injector Nozzle Tester, Part No. 3376947
NOTE: All nozzles must be tested for opening pressure,
chatter, and spray pattern.
Check the injector opening pressure.
A. Open the valve.
B. Operate the lever at one stroke every second.
C. Read the pressure indicated when the injector spray
If the opening pressure does not meet specifications, try
one of the following solutions:
1. Add shims to increase pressure.
2. Remove shims to decrease pressure.
1. Open the valve (A).
2. Operate the lever (B) to maintain a pressure of 20 bar
[290 psi] below opening pressure (C).
3. No drops should fall from the tip (D) within 10 seconds.