MANN+HUMMEL is supplying the oil filter and fuel pre-filter and main filter with numerous integrated functions for the 5.1 and 7.7 liter diesel engines of the Chinese producer Yuchai. This enables MANN+HUMMEL to demonstrate its excellent systems expertise again when it comes to liquid filtration.

In order to ensure the efficiency and durability of an engine, it is necessary to filter out harmful particles from all flowing liquids. The Chinese manufacturer Yuchai is bullish on the systems expertise of MANN+HUMMEL and has opted to procure the fuel pre-filter and main filter in addition to an oil filter module for its 5.1 and 7.7 liter diesel engines. The special point here is that all three components were developed locally for the customer and are produced at the Chinese location in Liu Zhou. The components are all characterized by their compact design.

The oil filter module

The oil filter module includes a variety of components and is equipped with a number of functions. In addition to the cooler, the engineers integrated an intelligent thermal management. The core element is a wax element which constantly maintains the oil temperature in the required range. The wax element is sensitive to the smallest changes in temperature. Furthermore, the oil filter module includes a bypass centrifuge for effective oil cleaning which allows longer service intervals and thus lower maintenance costs. The centrifuge and the filter are easy to service without spilling oil because when the cover is unscrewed an oil drain channel is opened and the oil flows back into the oil sump. The filter element with the mixed fiber media MULTIGRADE O-M 14.1 has a filtration efficiency of 50 percent for particles with a size up to 14 micrometers.

The fuel pre-filter

The three-stage filter element reliably cleans the fuel and separates any water in the fuel for the complete lifetime of the filter element. In the first stage dirt particles are filtered. The second stage enlarges the water droplets and in a third step the water droplets are separated using a hydrophobic barrier. The fuel pre-filter uses a MULTIGRADE F_HC media to filter out 80 percent of particles with a size up to four micrometers. The disposal of the metal-free filter element is environmentally friendly. Apart from that, the filter impresses through an easy and clean maintenance concept with a drain screw on the bottom of the cover for emptying the fuel filter module during the service. In addition, an integrated water sensor indicates when the maximum water level is reached. After a successful service a hand-operated pump is used to refill the system with fuel.


The fuel filter module

The main fuel filter also has a metal-free element. The MULTIGRADE F-MB 500 filter media separates 99.8 percent of all particles with a size up to four micrometers and is therefore highly efficient. Besides, the main filter module is characterized by being service-friendly. A return channel to the tank for the discharge of fuel enables an easy and clean filter change.

With its extensive systems expertise and experience in the area of liquid filtration, MANN+HUMMEL offers the customer Yuchai three promising products. The filter modules impress with their compact design, numerous integrated functions and service-friendly maintenance concepts. In addition, the filters convince with a market-specific long service interval of 60,000 kilometers. Furthermore, engines equipped with the liquid filter systems meet the requirements of the China 6 emissions standard.