The cylinder head was then reassembled and fitted to the engine block, using new bolts (Febi 39805). ![]() ![]() Note: the tightening of the bracket bolts must not exceed 20Nm and it is important to ensure that the camshaft bearings are lubricated before installation. The cylinder head was prepared for reassembly with new camshaft support, camshaft, and new rocker arms (Febi 30132). This coating improves friction properties to reduce wear and optimizes engine fuel consumption. It has an upgraded version of the chain guides and superior quality chains treated with a TRITAN ® coating. This kit corresponds to the latest technical developments necessary to prevent the chain from breaking again. The kit includes upper and lower chains, chain guides, tensioners, and sprockets for the fuel injection pump and camshafts, and also the oil nozzle for the lower chain. The Febi timing chain kit 102040 for this engine has all the necessary parts for repair. When replacing a timing chain it is vital that all the components of the timing chain are replaced without any exception, failure to replace certain components can lead to serious consequences in engine operation. The cylinder head was removed and the valves were checked, no problems were found, the valves had not come into contact with the pistons.Īfter a thorough inspection of the engine, all damaged parts were assessed for replacement. In this case, the intake camshaft did not rotate freely, it was twisted and did not fit properly on the bearings, and a replacement was required.Ĭonsidering the damage already identified, it was necessary to check if the intake and exhaust valves had not collided with the pistons. It was necessary to carry out a thorough inspection of the engine, to check for any other damage. This is a typical example of a chain failure on the N47 engine. The upper chain had one broken link, the high-pressure fuel pump sprocket had broken teeth and the chain guide was also broken. With the crankshaft locked in position, the clutch, flywheel, and sump were removed for inspection.Īfter the removal of the timing chain housing, further damage was revealed. The camshaft support had sustained a significant fracture, which shows that a significant torsional force has been absorbed by the engine timing components. The camshaft chain was not visible and after inspection, it was located at the bottom of the timing chain housing, and also five rocker arms were broken. With the engine removed, the rocker cover was taken off to view any damage. The timing chain is located at the rear of the engine, close to the transmission and it is, therefore, necessary to remove the engine, to gain access to investigate the problem. In this article, we investigate an example fitted to a BMW E61 520d, that had covered 180,000km and had an engine that suddenly stopped, due to a suspected timing chain failure. However, some engines are well known for common faults, the N47 engine, in particular, is one of them. The system of a chain, to link the camshaft to the crankshaft and drive other components to operate the engine, has been proven for many years by various vehicle manufacturers, particularly BMW. As a result, hydraulically dampening elastomeric bearing – “Hydromounts” – were developed, which enable the isolating and dampening of vibrations. Despite all of this, passive rubber-metal components cannot absorb all of the vibrations within the chassis. ![]() The elastomeric materials used in the production of rubber-metal parts are matched precisely to the technical requirements and loads of their specific fitting position. ![]() Strut mountings can also be equipped with a bearing or bearing plate, which allows the strut to rotate with the steered wheels. It is an integral part of the suspension strut assembly. The suspension strut mounting consists of a composite rubber bush mounted on the top of the damper and connected to the vehicle’s chassis. These sub-frames are made of tubular steel or aluminum tubes and are mounted to the vehicle body with rubber-metal bushes. The desire for non-intrusive suspension systems that do not impact the interior of the vehicle has made it necessary to use a suspension sub-frame. The design of vehicles is constantly evolving.
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