This 5 piece set contains essential engine service tools for use with BMW N51, N52, N53 & N54 litre petrol engines. Compatible with a wide range of engine codes, this set ensures that the engine timing is set correctly using the specialist tools. Engine timing must be set correctly to ensure an engine runs properly. If timing is set incorrectly, the effects on an engine could be terminal, making this set an absolute must have when working on these BMW engines. Set Contains:  Camshaft Alignment Tool (N51 & N52 Only) Timing Chain Pre-Tensioning Tool Camshaft Alignment Tool (N53 & N54 Only) Camshaft VANOS Sensor Alignment Tool Flywheel/Crankshaft Alignment Pin