Engine and transmission 32 www.aftermarketonline.net FEBRUARY 2025 6FKDHᎱHU WDFNOHV %0: HQJLQH YLEUDWLRQ LVVXH Technicians facing engine noise and vibration problems on BMW diesel engines are being urged by Schaeffler’s REPXPERTs to check the solid pulley on the front-end auxiliary drive (FEAD) system, and to replace it with an INA overrunning alternator pulley (OAP) where possible. The FEAD system provides power to an increasing number of engine functions, with each driven function adding extra strain on the belt system. Workshops have reported seeing BMWs displaying the symptoms of this strain in increasing numbers. Alistair Mason, technical services manager at Schaeffler REPXPERT, said: “Engine designers are relying on increasingly complex auxiliary belt systems to provide power to critical components, “Unfortunately, a solid alternator pulley will not absorb the constant rotational irregularities coming from the engine, or sufficiently prevent them either. This is especially true in diesel engines. “Ultimately these vibrations can damage the entire drive system, creating noise and vibrations that can be heard and felt by the driver.” The problem can be fixed by upgrading the FEAD system to include an INA OAP. This is a particularly suitable option for BMW diesel engine cars manufactured between 2004 and 2011. Even though it is not the originally fitted component, significant improvement can be made by swapping out the original solid pulley for an INA OAP, Mason said. “This will smoothly disengage the FEAD from the rotational irregularities, rendering the engine quieter and improving drivability.” Just three INA OAP references cover BMW’s 1, 3, 5, 6 and 7 Series passenger cars, as well as the X1, X3 and X5 equipped with the 1.6 and 2.0 M47 and N47 diesel engines, and the six cylinder 2.5 and 3.0 M57 and N57 diesel engines. Visit www.repxpert.co.uk for more information. 'ULYH WR H[SDQG HQHUJ\ HᎰFLHQF\ Nissens Automotive is committed to ensuring the independent service and repair industry has access to the replacement parts it needs today, as well as those it will require in the future — despite its ongoing programme to develop premium quality components required for new energy vehicles including hybrid and battery electric. Alongside the replacement parts for advanced heat pumps offered for air conditioning systems of the latest NEVs, Nissens has a throttle body range, which is thoroughly designed, developed, manufactured and tested to the firm’s highest genuine quality standard, and is part of its expanding engine efficiency programme. As garage professionals will know, the throttle body is part of the engine’s air intake system, sitting between the air filter and the intake manifold. Its task is to adjust the airflow to the engine as the accelerator is used by the driver. It generally includes sensors or valves to ensure its precise control and, in some models, connects to a vacuum line or coolant circuit for its temperature control. Pushing the accelerator rotates the throttle plate, allowing the intake air through, with the vehicle’s ECU and MAF sensors subsequently adjusting the fuel injection system, to ensure the ideal air/ fuel mix is delivered into the combustion chamber to provide optimal engine performance and efficiency. Nissens throttle body range, developed and tested for excellent performance and long, trouble-free operation, is thoroughly assessed through a series of functional, high temperature endurance, durability, load and corrosion tests. The range encompasses ‘first fit’ products that include the necessary seals, gaskets and clips to ensure their easy and secure installation. In addition to these installation related advantages comes valuable technical support, but wholesalers supplying the Nissens throttle body range benefit too. This is because it is optimised to cover a wide variety of models to ensure effective car parc coverage. The entire Nissens engine efficiency programme caters for 9,000 OE numbers and also includes turbos, intercoolers, EGR valves, modules and coolers and is supported with comprehensive vehicle data.
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