156718-4720 ZEXEL 9 423 613 345 BOSCH FLYWEIGHT ASSEMBLY 9423613345 1567184720

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
The 557-7633 Fuel Injector Gp has stayed the same, but the design level has changed to -02.The following injectors are affected by this issue:
387-9427
387-9432
387-9433
557-7633For fuel injectors leaking oil into the fuel and/or experiencing pressure too low symptoms, replace the o-ring seals and back-up rings prior to replacing the fuel injectors. If oil leakage is experienced after seal replacement, replace the fuel injector.The table below contains the parts needed for seal and ring replacement.
Table 1
Required Parts
Item Qty Part Number Part Name
1 1 109-3207 O-Ring Seal
2 2 148-2903 O-Ring Seals
3 1 149-5240 Backup Ring
4 1 293-0730 Backup Ring