torque BMW 740i 2001 E38 M62TU Engine Workshop Manual

4
VANOS BENEFITS
The design of a camshaft for a non adjustable valve timing system is limited to the required
overallperformance of the engine.
• An intake camshaft with an advanced(early) profile will provide a higher performing
power curve at a lower engine speed. But at idle speed the the advanced position will
create a large area of intake/exhaust overlap that causes a rough, unstable idle.
• On the other hand, an intake camshaft with a retarded(late) profile will provide a very
smooth, stable idle but will lack the cylinder filling dynamics needed for performance
characteristics at mid range engine speeds.
The ability to adjustthe valve timing improves the engines power dynamics and reduces
tailpipe emissions by optimizing the camshaft angle for all ranges of engine operation.
VANOS provides the following benefits:
• Increased torque at lower to mid range engine speeds without a loss of power in the
upper range engine speeds.
• Increased fuel economy due to optimized valve timing angles.
• Reduction of exhaust emissions due to optimized valve overlap.
• Smoother idle quality due to optimized valve overlap.

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VANOS SERVICE NOTES
VALVE TIMING PROCEDURES
Refer to TIS for complete Valve Timing Procedures.M62 TU valve timing adjustment is sim-
ilar to the previous non VANOS M62 engine with the exceptionof setting the VANOS
transmissions to their max retard positions with an ohmmeter and attaching the camshaft
gears to each camshaft with single reverse threaded bolts.
• After locking the crankshaft at TDC, the camshaft alignment tools (P/N 90 88 6 112 440)
are placed on the square blocks on the rear of the camshafts locking them in place.
• The exhaust camshaft sprockets and VANOS transmission units with timing chains are
placed onto their respective camshafts.
• The exhaust camshaft sprockets and VANOS transmissions are secured to the
camshafts with their respective single, reverse threaded bolt. Finger tighten only at this
point. Install the chain tensioner into the timing chain case and tension the chain.
• Connect an ohmmeter across two of the three pin contacts on the front edge of one of
the VANOS transmissions. Twist the inner hub of transmission to the left (counter clock-
wise). Make sure the ohmmeter indicates closed circuit. This verifies that the trans-
mission in the default max retard position.
• Using an open end wrench on the camshaft to hold it in place, torque the VANOS trans-
mission center bolt to specification.
CAMSHAFT IMPULSE WHEEL POSITION TOOLS
The camshaft impulse wheels require a special tool set
to position them correctly prior to torquing the retaining
nuts.
The impulse wheels are identical for each cylinder
bank. The alignment hole in each wheel must align
with the tool’s alignment pin. Therefore the tools are
different and must be used specifically for their bank.
The tool rests on the upper edge of the cylinder head
and is held in place by the timing case bolts.
Refer to the TIS repair manual section for complete
information.
BANK I TOOL
BANK I TOOL
BANK II TOOL
ALIGNMENT
IMPULSE

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DME-ME 7.2 ENGINE MANAGEMENT SYSTEM
The “ME” designation identifies the system as “M” = Motronic, “E” = EML.
• Manufactured by Bosch to BMW specifica-
tions
• 134 pin SKE (standard shell construction) con-
trol module located in E box
• Diagnostic communication protocol-KWP2000
• Uses break-out box set (P/N 90 88 6 121 300)
• Integral EML throttle control system
- monitors an interior installed PWG
- actuates an electric throttle valve (EDK)
• Integral Cruise control functionality
- monitors cruise control requests
- monitors brake pedal and clutch switches
- carries out throttle control directly via EDK
• Carries out DSC III torque reduction requests.
• VANOS control
• Integrated altitude sensor
• Integrated temp sensor for monitoring E box
temperatures
• Control of E-box fan
• One touch engine start control
• Oxygen Sensor heating
• Engine overrev & Max speed limitation
• Active Hall sensor for camshaft position monitoring
• Single speed secondary air injection system
• Electrically heated coolant system thermostat
• Longlife spark plugs
• IHKA Auxiliary Fan control
•DM-TL (Diagnostic Module - Tank Leak Diagnosis System)
ME 7.2 LOCATION IN E-BOX
1
(9 pins)2
(24 pins)3
(52 pins)4
(40 pins)5
(9 pins)