Engine Repair Manual. General information BMW 5-series cars have in-line water-cooled engines. The engine with a displacement of 1.8 liters has 4 cylinders. The rest of the engines have 6 cylinders....
The device of engines M20, M50, M30, M21, M51 M20 engine (520i, 525i models before April 1990) 1 high voltage distributor 2 Nozzle 3 intake valve 4 viscous coupling 5 toothed belt 6 V-belt 7 Oil pump 8...
Removal and installation of the engine The engine is removed without the gearbox up. The intake and exhaust manifolds, as well as the carburetor and alternator, remain on the engine. Under no...
Removal and installation of a gear belt Attention: As part of the maintenance schedule, the toothed belt must be replaced every 4 years. If the toothed belt is removed, it must be replaced regardless...
Toothed belt drive device M20 engine 1 Upper toothed belt guard 2 Lower toothed belt cover 3 Bolt M6 4 Bolt M6 5 Bolt M6 6 Rubber cover 7 Engine mount hook 8 Pulse transmitter 9 Bracket...
Belt tension Loosen bolt E just enough so that the tensioner pulley can move under the action of the spring. Rotate the engine to top dead center. In this case, the toothed...
Removal and installation of a camshaft Withdrawal Attention: The description is given only for the M20 engine. Remove the cylinder head and install it on 2 wooden spacers. Remove rocker shafts....
Gas distribution mechanism Gas distribution mechanism. M30 engine 1 Camshaft 2 Key 3 Bolt 4 Copper O-ring 5 adapter 6 Roll pin 7 Nut 8 Bolt 9 Chain sprocket 10 Roll pin 11 Spring washer...
Removal and installation of valves M20/M30 engines Withdrawal Attention: If the valve actuator parts are to be installed again, they must be installed in their original positions. To do this,...
Checking the valve guides When repairing cylinder heads with leaky valves, it is not enough to lap or replace the valves and valve seats. In addition, it is imperative to check the wear...
Processing of valve seats in the cylinder head Valve seats with increased wear and burnout can be machined on all engines as long as the correction angles and seat widths can be maintained. A swivel tool is...
Lapping of valves With perfectly machined valve seats and the installation of new valves, valve lapping is not necessary. Valves should be rubbed with a fine grinding paste. To...
Turbocharger The diesel engines of the BMW 5 Series are equipped with a turbocharger. In the turbocharger, two turbine wheels are located on one shaft, placed in separate...
Gas receiver device gas receiver 1 Turbocharger 2 Threaded pin 3 Oil supply line 4 O-ring 5 Connecting piece 6 Oil return line 7 O-ring 8 Bolt 9 Washer 10 Hose clamp 11 Hose 12...
Removal and installation, check of the vacuum pump The vacuum pump is located on the 2.4 liter diesel engine under the cylinder head cover, and on the 2.5 liter diesel engine on the side of the cylinder head...
Removal and installation of a gear belt — model 518i Attention: If the toothed belt is removed, it must be replaced regardless of its service life. A BMW tool is required to adjust the correct tension. Withdrawal...
Engine Troubleshooting If the engine does not start, systemic troubleshooting should be performed. There can be two reasons for starting the engine on gasoline engines: The air-fuel...