This Owners Workshop Manual has been specially written for the owner who wishes to maintain his or her car in first class condition and to carry out his own servicing and repairs. Covering the BMW 518, 520 and 520i. E12 series, Four and six cylinder engines from 1973 to 1981. Comprehensive step by step instructions and illustrations are given on all dismantling, overhauling and assembling operations. With chapters on the four cylinder engine • six cylinder engine • fuel system • ignition system • cooling system • clutch • manual transmission • automatic transmission • propeller shaft rear axle and suspension • front suspension and hubs • steering gear • braking system • electrical system • bodywork • technical data and wiring diagrams.