check oil BMW 740i 2001 E38 M62TU Engine Workshop Manual

7
M62 TU VANOS COMPONENTS
M62 TU VANOS components include the following
for each cylinder bank:
•New cylinder heads with oil ports for VANOS
•VANOS transmission with sprockets
•Oil distribution flange
•PWM controlled solenoid valve
•Oil check valve
•Camshaft position impulse
VANOS CONTROL SOLENOID & CHECK VALVE:The VANOS solenoid is a two wire,
pulse width modulated, oil pressure control valve. The valve has four ports;
1. Input Supply Port - Engine Oil Pressure
2. Output Retard Port - To rear of piston/helical gear (retarded camshaft position)
3. Output Advance Port - To front of piston/helical gear (advanced camshaft position)
4. Vent - Released oil pressure
A check valve is positioned forward of the solenoid in the cylinder head oil gallery. The
check valve maintains an oil supply in the VANOS transmission and oil circuits after the
engine is turned off. This prevents the possibility of piston movement (noise) within the
VANOS transmission system on the next engine start.

12
VANOS SOLENOID REPLACEMENT
Refer to TIS repair manual section for com-
plete solenoid replacement procedures.
The solenoids are threaded into the oil distri-
bution flanges through a small opening in the
upper timing case covers.
Special Tool 11 6 420 is required.
VANOS TRANSMISSION RETARD POSI-
TION SET UP TOOLS
Special Tool 11 6 440 is used to rotate the
transmission to the full retard position when
checking the piston position with an ohmme-
ter.
This tool engages the inner hub of the trans-
mission provides an easy method of twisting
it to the left for the ohmmeter test.
Refer to SI Bulletin 04 12 98 for additional
special tool information.
DIAGNOSIS
The VANOS is fully compatible with the diagnostic software providing specific fault codes
and test modules. Additionally, diagnostic requests section provides status of the PWM of
the VANOS solenoids and camshaft position feedback via the camshaft position sensors.
The Service Functions section of the DIS/MoDiC also provides a VANOS system test.
11 6 440
11 6 420