Opel 1900 1973 Service Manual page 426

a. O p e r a t i o n o f C o n t r o l s i n N e u t r a l E n g i n e R u n n i n g
Reverse Clutch Released
Second Clutch Released
Whenever the engine is running with the selector lever in Neutral, oil is pulled from the sump into the oil pump and is dispensed from the pump under preure.
The pressurized line oil if directed to the priming valve which bleeds off the air. Line oil is directed to the vacuum modulator YBIYB, to the prexwre
and to the manual veIve. The converter is fed through the pressure regulator MIYB. the return
into the transmisGon's lubricating system.
Line oil directed to the vacuum modulator valve becomes regulated to modulator oiland acts on the pressure regulator boosI YBCB. the IDW speed downshift timing
the 1 2 accumulator MIYB. and the detent valve.
Low control delve.
Summary
The converter is filled. the clutches and IDW band are released.
L o c k e d
oil from the converter being directed through the coalerand back
The modulator oil passes through the detent valve to act 00 the I 2 shift control give. the 3 2 control
The transmission is in Neutral.
Third Clutch Released
Low Band Released
regulator valve
regulator valve before being directed to the