The BMW M50 is an I6 piston motor. It was introduced in 1989 to change M20 one and was replaced by the M52 motor in 1994. Displacement ranges from 2.0 L to 3.0 L. It is a DOHC 24-valve engine. A Technical Update or M50TU version from 1992 introduced VANOS variable valve timing.
The M50 was related to the M20 with the same 91 mm cylinder spacing, bore, and stroke at 2.0 L and 2.5 L.
USEFUL, different: BMW E36 RADIATOR AND COOLING SYSTEM TROUBLESHOOTING
Most cooling system faults can be grouped into one of three categories :
Cooling system leaks
Poor coolant circulation
Radiator cooling fan faults
When investigating the cause of overheating or coolant loss, begin with avisual inspection . Be sure to check the condition and tension of the coolant pump drive belt. Check hoses for cracks or softness . Check clamps for looseness. Check the coolant leve¡ and check for evidence of coolant leaks from the engine.
Check that the radiator fins are not blocked with dirt or debris. Clean the radiator using low-pressure water or compressed air. Blow outward, from the engine side out.
If the starter tucos the engine slowly or fails to operate when the ignition is in the start position, check the battery first. Inspect the starter wires, terminals, and ground connections for good contact. In particular, make sure the ground connections between the battery, the body and the engine are completely clean and tight. If no faults can be found, the starter may be faulty and should be replaced.
A high oxygen level in the engine exhaust indicates a lean corairfuel mixture and a low oxygen level indicates a rich mixture . The oxygen sensor, shown in Fig. 10, measures the oxygen content in the exhaust gas and generates a variable voltage signal . Using that feedback signal as an input, the DMEcontrol module fine tunes the air-fuel mixture. As the oxygen sensor ages, its ability to react quickly to changing conditions deteriorates, and it mayeventually cease to produce any signal at all. To check the operation of the oxygen sensor, see 130 Fuel Injection:
The airbags are triggered by impacts coming from the directions shown in the illustration. Note that the supplementary protection against lateral impact is available only on vehicles equipped with optional door-mounted airbags.
Indicator lamp in instrument cluster The indicator lamp comes on from ignition key position 1 to indicate that the system is operational. System operational: * The indicator lamp comes on briefly. System malfunction: * The indicator lamp fails to come on. * Indicator lamp lights up for approx. 4 seconds, goes out briefly and then lights up again.
A system malfunction could prevent the system from responding to an impact occurring within its normal response range.
Please have your authorized BMW Retailer inspect and repair the system as soon as possible.
ABS enhances active safety by helping to prevent the wheels from locking under braking. When the front wheels slide, the driver loses steering control over the vehicle. Traction loss at the rear wheels can cause the rear end to break into uncontrolled over steer.
ABS is designed to meet two essential requirements during every application:
* to help provide vehicle stability on all types of road surface (asphalt, cement, dirt, moisture, snow and ice). * to help to retain steering and maneuvering capability under the same conditions
However, certain important considerations must be borne in mind in connection with these requirements: Not even ABS can suspend the normal laws of physics. ABS alone can not prevent accidents when the brakes are applied without an adequate safety interval between vehicles, when the car reaches excessive rates of lateral acceleration in curves, or if aquaplaning occurs. Responsibility for these types of situations remains in the hands (and feet) of the driver. You should never allow the added safety of ABS to lull you into a false sense of security, or mislead you into taking increased risks that could affect your own safety and that of others.
The last 740d was a 4.0 V8 diesel. Confusingly to people outside BMW, the new 740d is not a V8, nor a 4.0-litre. Ah. Nope, the new biggest diesel in the 7-Series range is a new super-efficient twin-turbo straight-six, and it's a 3.0-litre block, but this time not derived from the same 3.0-litre motor that you find in 30d and 35d versions elsewhere in the BMW ranges.
Still with me? Right, explanation ahoy: this new motor gets an all-aluminium crankcase and third-generation, common-rail fuel injection that's good for 2,000 bar of pressure. Piezo injectors provide the injection, and big pressure and fine control are good things. Higher pressure means bigger bangs, control means more efficient burns, the pair bring better power and economy.
The airbags are triggered by impacts coming from the directions shown in the illustration. Note that the supplementary protection against lateral impact is available only on vehicles equipped with optional door-mounted airbags. 
The indicator lamp comes on from ignition key position 1 to indicate that the system is operational.
ABS enhances active safety by helping to prevent the wheels from locking under braking. When the front wheels slide, the driver loses steering control over the vehicle. Traction loss at the rear wheels can cause the rear end to break into uncontrolled over steer.