BMW 645Ci COUPE 2003 E63 N62B44 Engine Repair Manual

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N62 Engine
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Oil Pressure Switch
The oil pressure switch is located on the side in the bank 1-4 cylinder head.
Oil Pump
The oil pump is mounted at an angle to the crankshaft bearing cap and is driven by the
crankshaft using a roller chain. The oil pump is a two-stage gear oil pump with two paral-
lel switched gear clusters.
The two pair of gear clusters are stacked one
behind the other and work in two stages.
Stage two (both pump supply circuits) is only
active in the lower engine speed range up to
approx. 2,000 rpm to provide sufficient oil pres-
sure for the VANOS at high oil temperatures.
Stage two is deactivated hydraulically at a pres-
sure of 2 bar.
42-02-73
42-02-75
42-02-76 Oil Pump
1. Drive Shaft
2. Mounting Points
3. Oil Filter
4. Pressure Relief Valve (over 15 Bar)
5. Control Valve (Pump Stage/Pressure Control)
6. Oil supply from the oil pump to the engine
7. Oil pressure control tube from the engine to
the control valve.

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N62 Engine
Oil Pressure Control
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Oil Pressure Control
1. Oil Pump Stage 1 5. Sealing Plug
2. Oil Pump Stage 2 6. Oil Pump Housing
3. Pressure Control Valve Piston 7. Oil Sump
4. Pressure Control Valve Spring

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N62 Engine
Oil Filter
The canister type oil filter (3) is located under the
engine by the oil sump. The support for the oil
filter is integrated in the rear oil pump cover.
The oil filter housing (2 with o-ring) is threaded
into the rear of the oil pump cover through an
opening in the oil sump.
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).
.
The filter element support dome contains an over pressure relief valve. If the filter element
is blocked, this valve bypasses unfiltered engine oil around the element to the supply lubri-
cation to the engine.
Pressure Control
The oil pressure control valve in the oil pump has two functions:
1. Deactivates stage two oil pump circuit above 2 bar. Stage two is only active in the
lower speed range. This is to ensure that there is always sufficient oil pressure for
the VANOS units even at high oil temperatures and low speeds. The oil pump power
consumption is reduced by deactivating stage two.
2. Monitoring the required oil pressure for the engine. The piston in the control valve is
moved by a spring against the engine control pressure which is returning from the
engine. This means that precise monitoring of the actual engine oil pressure is pos-
sible.
A A
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1
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es
s.
.
42-02-77

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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?