Engine: general information BMW 3-series cars have in-line engines, which, depending on the displacement, have 4 or 6 cylinders. The power unit has a longitudinal arrangement in the...
Removal and installation of the engine Before removing the engine, the gearbox must be removed. The engine is removed without the gearbox up. The intake and exhaust manifolds, as well as the...
Removal and installation of a gear belt Models 316i, 318i before August 1993 Attention: Do not reinstall a removed toothed belt, but if it has been tensioned at least once, replace it, regardless of...
Removal and installation of valves (all models) Withdrawal Attention: If the valve actuator parts are to be installed again, they must be installed in their original positions. To do this, when removing...
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 are processed when there is increased wear and burn marks. In this case, certain values of the correction angles and the width of the saddles must...
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...
Replacing the A/C Compressor V-Belt (All Models) The A/C compressor is driven via an extra wide V-belt with automatic tension. Insert a hexagon socket wrench into the idler pulley bolt. By slowly turning...
V-belt tension Tighten tensioning roller -2- with a torque wrench to a tightening torque of 7 Nm. Tighten bolt nut -3-. In workshops, the exact check and adjustment of the...
V-ribbed belt replacement, models 318tds, 325td/tds These 324td diesel engines are fitted with an extra wide V-belt (V-ribbed belt), which drives the generator, water pump and power steering pump. Attach a...
Engine Troubleshooting If the engine does not start, systemic troubleshooting should be performed. Two reasons can be an obstacle to starting the engine on gasoline engines: the...
Engine lubrication system All-weather oil must be used for BMW engines. Multigrade oils have the advantage that they operate over a wide temperature range (summer Winter). The basis of...
Application ranges/viscosity grades of engine oils Black - oils for diesel engines; white - oils for gasoline engines. Since the ranges of application of seasonal oils of neighboring SAE classes overlap,...
Engine oil specification Only HD oils are allowed for modern engines. HD oils are alloyed oils whose lubricating properties are greatly improved by the addition of various chemicals....
Oils for BMW 3 Series engines BMW prescribes the following oils: Gasoline engines: oil meeting the minimum requirements of grade CCMC-G4 or API SG. Diesel engines: oil meeting the minimum...
Oil consumption In internal combustion engines, oil consumption refers to the amount of oil that is consumed as a result of the combustion process. Oil consumption cannot be...
Lubrication circuit BMW engines have a so-called circulating lubrication system. The oil pump takes oil through the oil intake from the oil sump and supplies it to the main oil...
Oil pressure check Warm up the engine while driving. When the operating temperature is reached, the oil should have a temperature of about 80 degrees. Check oil level. The oil...
Removal and installation of an oil crankcase Oil sump on models 316i, 318i Figure W—1625 1. Oil sump 2. Hairpin 3. Cork 4. O-ring 5. Oil drain plug 6. O-ring, size A12x15.5-AL 7. Tray 8. Bolt 9. Lid 10....
Removal and installation, check of the oil pump Removal, models 316i, 318i produced before August 1993 (M40 engine) Attention: Since the removal of the oil pump requires a lot of preparatory work and is also...