Page 16 of 55
Downloaded from www.Manualslib.com manuals search engine Silencers
• A 1.8 liter capacity front silencer has been fitted for each cylinder bank.
• A single 5.8 liter center silencer is fitted downstream of the two front silencers.
• The resonator type rear silencers have capacities of 12.6 and 16.6 liters.
Exhaust Gas Flap
The 12.6 liter rear silencer is fitted with an exhaust gas flap to keep noise to a minimum at
engine idle speed and low rpm. The exhaust gas flap is opened allowing additional flow
when:
• The a transmission gear is engaged a an
nd
d
• The engine speed is above 1,500 rpm
A vacuum-controlled diaphragm (actuator mounted on the silencer) opens and closes the
exhaust gas flap. The exhaust gas flap is closed with vacuum, and is sprung open by the
actuator (when vacuum is not present). The procedure is carried out using a solenoid valve
which is electrically controlled by the ECM.
Secondary Air System
Blowing additional air (secondary air) into the cylinder head exhaust ducts during the warm-
up phase results in a thermal secondary combustion which results in a reduction of the
non-combusted hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gas. The
energy generated during this process heats up the catalytic converter faster during the
warm-up phase, and increases it’s conversion rate.
14
N62 Engine
43-02-05
Secondary Air System
1. Air Intake Duct
2. Air Cleaner housing with Intake Air Silencer
3. Intake Pipe with HFM (Hot-Film Air-Mass
Sensor)
4. Non-return Valves
5. Secondary Air Pump
Page 19 of 55
Downloaded from www.Manualslib.com manuals search engine Alternator
Due to the high power capacity of 180 A, the alternator is cooled by the engine's cooling
system to enhance heat dissipation. The brushless Bosch alternator is installed in an alu-
minum housing which is mounted to the engine block. The exterior alternator walls are sur-
rounded with circulated engine coolant. The function and design of the alternator is the
same as in the M62, with only minor modifications. The BSD interface (bit-serial data inter-
face) for the ECM is new.
* Further details found in the cooling circuit
section
Regulation
The alternator communicates with the Engine Control Module (ECM) via the BSD (bit-seri-
al data interface). The alternator conveys data such as model and manufacturer. This is
necessary to allow the engine management system to adapt it’s calculations and specific
control to the type of alternator fitted.
17
N62 Engine
42-02-17
Alternator
1. Watertight Housing
2. Rotor
3. Stator
4. Seal
Alternator Coolant Flow
1. Coolant Return Flow
2. Coolant Inlet Flow
42-02-18
Page 40 of 55
Downloaded from www.Manualslib.com manuals search engine 38
N62 Engine
Cooling System
Coolant Circuit - 14 Liter Coolant Capacity
42-02-56
Cooling System (Circuit Flow)
1. Cylinder Head Bank 5-8 12. Radiator
2. Coolant Supply (heater core) 13. Radiator Partition (low temp section)
3. Water valve with electric water pump 14. Temperature Sensor
4. Cylinder Head Gasket 15. Water Pump
5. Coolant Supply Line 16. Radiator Return Flow
6. Cylinder Head Ventilation Lines 17. Radiator Ventilation Line
7. Hole (crankcase venting system) 18. Expansion Tank
8. Transmission oil lines 19. Thermostat
9. Oil/water heater exchanger for automatic transmission 20. Cylinder Head Bank 1-4
10. Thermostat for transmission oil heat exchanger 21. Vehicle Heater
11. Alternator Housing 22. Radiator (High Temperature Area)
Page 54 of 55
Downloaded from www.Manualslib.com manuals search engine 52
N62 Engine
Oil Cooling (if equipped)
An oil cooler is used in hot countries. The oil cooler is located in front of the radiator above
the A/C condenser. The engine oil flows from the oil pump through a channel in the
crankcase to a connection on the generator support. The generator support has an oil ther-
mostat. A wax element in the oil thermostat continuously opens the inflow to the oil cooler
when the oil temperature is between 100 ºC to 130 ºC.
Some of the engine oil always flows past the oil thermostat and through the engine with-
out being cooled, even when the oil thermostat is fully open. This ensures a minimum
amount of oil is supplied when the cooler is faulty. A modified generator support, without
connections for the oil thermostat, is fitted to vehicles which do not have an oil cooler.
Technical Data - Lubrication System
The recommended oil is BMW High Performance 5W-30 Synthetic Oil
* P/N 07 51 0 017 866
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8.0 Filling Capacity for Service with Oil Filter Change
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1.0 Minimum Oil Pressure at 20ºC
4.0 - 8.0 Bar Maximum Oil Pressure at 20ºC
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9-12 I/Min At Idle Speed (700 rpm) at 20ºC
50-55 I/Min At Maximum Engine Speed (6500 rpm) and 20ºC
