50014085 Fuel filter 4085-FX

Kolbenschmidt fuel filter 4085-FX for MAN trucks and buses. Cross-referenced directly to MAN OEM parts 51125030088 and 51125030109, making it a compatible service replacement across MAN TGA, TGS, TGX, and TGM platforms using the standard primary fuel filter housing. Kolbenschmidt (part of the Rheinmetall Automotive group) is a tier-1 OEM supplier — this filter is built to the same filtration efficiency, water separation, and pressure-drop specifications as the MAN original part. The 4085-FX designation indicates the filter series and performance class within the Kolbenschmidt range. Replace at the intervals specified in the MAN maintenance schedule or immediately when water contamination is detected in the separator bowl — prolonged exposure to water causes rapid corrosion of injection pump internals and injector solenoids. When fitting, lubricate the O-ring seal with clean diesel and hand-tighten the filter. Prime with clean fuel before engine start to minimise dry-running of the injection system.