Gasoline and diesel engines BMW 5 Series E34

Engine Repair Manual. General Information
BMW 5-series cars have in-line water-cooled engines. The engine with a working volume of 1.8 liters has 4 cylinders. The other engines have 6 cylinders. The...

The design of engines M20, M50, M30, M21, M51
Engine M20 (models 520i, 525i produced before April 1990.) 1 High voltage distributor 2 Nozzle 3 Inlet valve 4 viscous coupling 5 Toothed belt 6 V-belt 7 Oil...

Main technical data of the engine

Removal and installation the engine
The engine is removed upwards without the gearbox. The intake and exhaust manifolds, as well as the carburetor and generator, remain on the engine. In no case...

Removal and installation the timing belt
Note: As part of the maintenance schedule, the timing belt must be replaced every 4 years. If the timing belt is removed, it must be replaced regardless of its...

Toothed belt transmission device
Engine M20 1 Upper timing belt cover 2 Lower timing belt cover 3 Bolt M6 4 Bolt M6 5 Bolt M6 6 Rubber cover 7 Engine suspension hook 8 Pulse sensor 9 Bracket...

Belt tension
Loosen bolt E just enough to allow the tension roller to move under the action of the spring. Turn the engine to the top dead center position. This will...

Removal and installation the cylinder head cover
Engine M20 Removal Unscrew the support plate F. Disconnect the ventilation hose "arrow". Remove 8 bolts and nuts and remove the cylinder head cover....

Removal and installation of cylinder head — engines M20, M21, M30
The cylinder head is removed on a cold engine. The intake and exhaust manifolds do not unscrew. Signs of a defective cylinder head gasket are: loss of engine...

Removal and installation the cylinder head — M50 engine (models 520i, 525i produced since May 1990)
The cylinder head is removed on a cold engine. The intake and exhaust manifolds do not unscrew. Signs of a defective cylinder head gasket are: loss of engine...

Removal and installation the cylinder head — M51 engine (models 525td/tds)
Signs of a defective cylinder head gasket are: loss of engine power decrease in coolant level, white smoke from exhaust gases when the engine is warm coolant...

Removal and installation the camshaft
Removal Note: Description is given only for M20 engine. Remove the cylinder head and install it on 2 wooden spacers. Remove the rocker arm shafts. Loosen the...

Removal and installation rocker arms and rocker shafts
Particularly strong valve knocks can be caused by loose rocker arm sliders. Caution: If the valve train components are to be reinstalled, they must be...

The device of the gas distribution mechanism
Gas distribution mechanism. Engine M30 1 Camshaft 2 Key 3 Bolt 4 Copper sealing ring 5 Adapter 6 Cylindrical pin 7 Nut 8 Bolt 9 Chain sprocket 10 Cylindrical...

Valve drive device
Valve drive - M21 engine 1 Camshaft 2 Plain bearing 3 Rocker 4 Eccentric 5 Knurled Head Screw 6 Nut 7 Retaining spring 8 Ball pin 9 Inlet valve 10 Exhaust...

Removal and installation valves
Engines M20/M30 Removal Caution: If the valve train components are to be reinstalled, they must be installed in their original positions by stacking them in...

Checking the valve guides
When carrying out repair work on a cylinder head with leaky valves, it is not enough to grind or replace the valves and valve seats. In addition, it is...

Processing of valve seats in cylinder head
The treatment of valve seats with increased wear and burning can be performed on all engines as long as the values of correction angles and seat widths can be...

Lapping valves
If the valve seats are perfectly machined and new valves are installed, lapping the valves is not necessary. The valves should be lapped with a fine grinding...

Turbocharger
The diesel engines of the BMW 5 Series are equipped with a turbocharger. The turbocharger has two turbine wheels on one shaft, housed in separate housings. The...

Gas receiver device
Gas receiver 1 Turbocharger 2 Threaded pin 3 Oil supply line 4 Sealing ring 5 Connecting element 6 Oil outlet line 7 O-ring 8 Bolt 9 Spacer washer 10 Hose...

Removal and installation the exhaust gas turbocharger
Removal See Figure W-1098. Remove the hose going to the air collector, having first released and moved the clamps. Remove the air hose going to the air filter,...

Removal and installation, checking of the vacuum pump
The vacuum pump is located on a 2.4-liter diesel engine under the cylinder head cover, and on a 2.5-liter diesel engine on the side of the cylinder head and is...

Engine model 518i produced since January 1993 (4-cylinder engine M40)
Since the M40 engine as a 4-cylinder engine has differences primarily in the removal of the timing belt and cylinder head, these works are highlighted here in...

Removal and installation the timing belt — model 518i
Caution: If the timing belt is removed, it must be replaced regardless of its service life. A special BMW tool is required to adjust the correct tension....

Removal and installation the cylinder head — model 518i
The cylinder head is removed on a cold engine. The intake and exhaust manifolds do not unscrew. Signs of a defective cylinder head gasket are: loss of engine...

Removal and installation the alternator V-belt / tensioning the V-belt
Engines M20, M21, M30, M40 (2-valve engines except 525td/tds) For instructions regarding the M50 engine, see the end of the section. Removal Remove the fan....

Engine fault diagnostics
If the engine does not start, a systemic troubleshooting should be performed. There are two possible reasons for preventing the engine from starting on...

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