Engine Mounting Parts
Engine mounting parts
Throttle valve
The throttle body of the M62 has been newly designed. A mixing chamber has been realized in the area of the orifice for idle air control (ZWD 2).
This mixing chamber is formed by a plate with precisely designed orifices installed between the intake system and throttle valve.
The air for the idle actuator, the purge air of the carbon canister and the blow-by gasses via the uniform distribution pipe, leading from the pressure control valve for crankcase ventilation to the throttle housing, flow into this mixing chamber. Here, the blow-by gasses and the purge air of the carbon canister are mixed with fresh air. This ensures all cylinders receive the blow-by gasses uniformly thus providing a smooth and uniform idle quality.
Intake manifold
The intake manifold of the M62 is a one-piece plastic part. It corresponds to that fitted on the M60B40.
The pressure control valve for crankcase ventilation is mounted directly on the intake manifold. A distribution pipe leads from the pressure control valve through the intake manifold to the mixing chamber in the throttle valve in order to evenly distribute blow-by gasses over all cylinders.
A connection for the Master-Vac of the brake booster is provided in the cover of the intake manifold.
Ignition system
In the same way as the majority of BMW engines, the M62 features a static high- voltage distribution system.
Ignition coils
New ignition coils are used for the M62 engine. The ignition coils are of the same design as those fitted on the M52 engine. Due to their modified mechanical design, they are smaller and lighter compared to the ignition coils used to date.
Comparison Of Ignition Coils M60 - M62:
Alternator
A compact alternator (140 A) with fresh air intake is used on all vehicles equipped with the M62 engine.
A water-cooled 220 A alternator is still used on E31 vehicles (two batteries in luggage compartment!) with increased power requirements and thus a higher closed-circuit current (due to special options such as in-car telephone or independent heating).
Auxiliary fan
In connection with the special option air conditioning, a 3-stage electrically powered auxiliary fan is used in the E39.
This auxiliary fan is a standard feature in the models E31 and E38 since the air conditioning system is standard equipment in these vehicles.
To facilitate noise optimization, the previous two-stage circuit has been extended by a third stage. The cut-in criteria for the individual stages have been redefined.
Cut-in criteria
Starter
As on the M60, the starter used for all variants is a 12 V Bosch countershaft starter with an output power of 1.7 kW.
The lines and line arrangement to the battery charge terminal point are new in the series E38 and E39. The B+ lead is routed under the engine to the alternator and to the battery charge terminal point.
The battery charge terminal point is located on the timing case cover of cylinder bank 5 - 8.
On the E31, the battery charge terminal point is still located on the right-hand MacPherson strut tower.
Exhaust system
The complete exhaust system from the manifold to the tail pipe is made of stainless steel and is one piece from the manifold flange downward.
Exhaust manifold
As on the M60, air-gap insulated sheet metal exhaust manifolds are used on the
M62.
Catalytic converter
The headpipes are also air gap-insulated double pipes (tube-in-tube).
Catalytic converter is of a twin flute design each with 2 trimetall layers (platinum, palladium, rhodium) ceramic monolith per exhaust line. In order to achieve the lowest possible exhaust gas backpressure, the monoliths have the same cross section as those on the M73.