2005 BMW 745i cooling

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N62 Engine
Lubrication System
Crankcase with oil jets
The engine oil is supplied by the oil pump to the lubrication points in the engine block and
is pumped into the cylinder heads. The following components in the crankcase and cylin-
der head are supplied with engine oil:
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• Crankshaft bearings
• Oil jets for piston cooling
• Oil jet for the drive chain (bank 5-8)
• Tensioning rail for drive chain (bank 1-4)
Oil Check Valves
Three oil check valves are inserted into each cylinder head from the outside. This prevents
the engine oil from draining out of the cylinder head and the VANOS units.
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• Chain tensioner
• Guide rail on cylinder head
• Hydraulic valve adjustment elements (HVA)
• VANOS supply
• Camshaft bearings
• Overhead oil tubes for the valve gear
42-02-71 Crankcase with Oil Jets
1. Oil Jet for Drive Chain Cylinder Bank 5-8
2. Oil Jets for Piston Cooling
42-02-72
Oil Check Valves
1. Oil Check Valve for VANOS Intake
2. Oil Check Valve for VANOS Exhaust
3. Oil Check Valve for Cylinder Head Oil Supply

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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

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N62 Engine
Review Questions
1. What is the function of the throttle valve?
2. What are the conditions that will result in stage two oil supply?
3. What does the term “cracked” connecting rod mean?
4. What does the low temperature area refer to in the cooling system?
5. What is the difference between the left and right drive chain tensioning assemblies?
6. How is the funnel adjustment made on the 5-8 Variable intake manifold if only one
actuating motor is used?
7. What is minimum and maximum valve lift provided by the Valvetronic system?
8. What is chamber A and chamber B used for in the Bi-VANOS system?
9. What retains the initial VANOS sprocket to hub position when oil pressure is not pre-
sent?
10. How should the drive belt be removed?