WRENCH AS 4646929 - Caterpillar

Probable Causes
Leaking seals on the injector
Leaking seals on the valve mechanism cover
Excessive leakage from the tip of the injectorNote: For additional information, refer to , REHS3007, "Determining the Cause of Fuel Dilution of Engine Oil".Recommended Actions
Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Do not loosen any high pressure fuel lines when the engine is running. The high pressure in the fuel lines can cause personal injury or death. Wait 60 seconds after the engine has stopped to allow pressure to purge before any service or repair is performed on the engine fuel lines.
Leaking Seals on the Injector
Check for damage to the seals for the electronic unit injectors. Replace any seals that are leaking.Leaking Seals on the Valve Mechanism Cover
Check for damage to the seals between the electronic unit injector and the valve mechanism cover. Repair any leaking fuel lines or components and/or replace any leaking fuel lines or components.Excessive Leakage from the Tip of the Injector
Check for damage to the unit injectors. If necessary, repair the electronic unit injector or replace the electronic unit injector.