Abstract: A locomotive engine coolant filter arranged for facilitated maintenance notwithstanding obstructive confinement of the mounting space. The coolant filter is arranged to permit facilitated removal of the filter screen from the housing thereof for periodic maintenance as required. In one form, the filter housing is fixedly secured to the radiator inlet connector to extend coaxially thereof. In this form, the opposite end of the housing is provided with a removable closure permitting the withdrawal of the filter screen coaxially therefrom in the maintenance operation. In another form, the housing is removably sealingly clamped to the radiator inlet connector and to a flow passage duct for delivering coolant liquid from the engine. In this form, the filter screen is removable by a combined longitudinal and transverse displacement from the filtering position upon release of the clamps.