TECHNICAL CHARACTERISTICS – Motors – BMW E36
BMW PETROL ENGINE – M40
1 – fuel injector, 2 – valve lash compensator, 3 – flywheel, 4 – crank watt, 5 – coolant pump, 6-oil pump, 7 -throttle, 8 – intake manifold, 9 – ignition distributor, 10 – oil filter, 11 – thermostat, 12 – torsional vibration damper
BMW series cars 3 are powered by a four-cylinder in-line engine- or the six-cylinder m. The power unit is located in the engine compartment on the car axis and tilts 30 ° to the right. It can only be lifted upwards with a suitable hoist.
316i versions, 318i
M40 4-cylinder engine with a displacement 1,6 or 1,8 dm3. Since September 1999 the engine is modified (Timing Chain, ignition system, intake manifold) and designated M43.
318is versions, 318you; 318is, 318you
4 cylinder engine, 4-valve M42 with a capacity 1,8 dm3.
320i versions, 323i, 323you, 325i, 328i
6 cylinder engine, 4-valve M50 with a capacity 2,0 or 2,5 dm3. Since September 1992 slightly modified (M50 VANOS). From January 1995 with aluminum engine block, marked M52.
4-cylinder diesel engine, turbocharged M41 with a capacity 1,8 dm3.
Versions 325td, 325tds
6-cylinder diesel engine, turbocharged M51 with a capacity 2,5 dm3.
The gray cast iron engine block has cylinder bores. The cylinder head made of aluminum is bolted to the upper plane of the engine block, which has better thermal conductivity and lower mass, than gray cast iron.
The cylinder head of gasoline engines follows the principle of lateral flow. Means, that fresh air-fuel mixture flows to one side of the cylinder head, and the exhaust gases are discharged on the opposite side. Transverse flow ensures quick charge exchange in the cylinders. There is a camshaft on the cylinder head. In M40 engines, the camshaft is driven from the crankshaft by a toothed belt.
The valves are driven by the camshaft by means of the valve levers, the other ends of which rest on hydraulic tappets. As a result, the valve clearance is automatically compensated.
6-gasoline cylinder engines are equipped with two camshafts; one for intake valves, the other for exhaust valves. As in diesel engines, the camshafts are driven by roller chains. Maintenance-free hydraulic tappets work in conjunction with the intake and exhaust valves on these engines.
It is not necessary to adjust the valve clearance during inspections.
Since September 1992 6-cylinder engines are equipped with, among others. w variable camshaft control (VANOS). Via the intake camshaft adjuster, depending on the engine speed, it is twisted in relation to the sprocket. As a result, valve control times are optimal for a given rotational speed of the engine. The positioner is activated by the engine control device.
Other engine modifications, aimed at obtaining the best parameters in terms of idling, torque characteristics, exhaust emissions and fuel consumption, consisted in increasing the compression ratio with simultaneous selective regulation of knocking combustion, the use of valve springs with lower forces, lighter pistons and longer cranks.
The engine is lubricated by an oil pump, which in a 6-cylinder petrol engine is located in an oil pan in front of the crankcase and driven from the crankshaft by a roller chain. For 4-cylinder gasoline and diesel engines, the oil pump is located in the crankcase at the end of the crankshaft, with which it is meshed. The oil sucked in from the pan reaches the crankshaft bearings and the camshaft through channels and lines, and also for cylinder surfaces.
The coolant pump is attached to the front of the engine block and is driven on 4-cylinder and diesel engines) V-belt, which also drives the alternator. From the pump shaft, through the viscous clutch, the fan is driven, activated after exceeding a certain temperature value. On M40 engines, the coolant pump is driven from the camshaft by a toothed belt.
Please note, keep the cooling system full year round with a mixture of soft water and anti-freeze and anti-corrosion agent.
The preparation of the ignitable fuel-air mixture takes place in an electronic ignition / injection system, ensuring the maintenance of constant exhaust emission parameters.
On versions 316i and 318i manufactured up to August 1993 instead of the ignition distributor, it is mounted on the head of the so-called. high voltage divider, driven directly by the camshaft. The remaining gasoline engines are static, wear-free electronic ignition system. In diesel engines, fuel metering is also electronically controlled via the DDE system (Digital diesel electronics).
THE BMW M51 DIESEL ENGINE (325 td, 325 tds)
1 – camshaft, 2 – hydraulic pusher, 3 – valve, 4 – turbocharger, 5 – thermostat, 6 – coolant pump 7 – oil pump, 8 – intake manifold, 9 — vacuum pump, 10 – Timing Chain, 11 – belt tensioner, 12 ~ toothed belt, 13 – viscous clutch.