Automatic Gearbox - Porsche 928 S 1986 Driver Manual

Automatic gearbox

The automatic gearbox facilitates the driving
of the vehicle. The individual gears are select­
ed automatically, depending on the position of
the gear selector lever, the speed of the vehicle
and the position of the accelerator.
For safety reasons, the engine can only be
started with the selector lever in position Ρ
or Ν.
The selector lever has six positions, and is
fitted with a mechanical lock-out to avoid in­
advertent selecting of the wrong gear.
The current selector lever position lights up in
the display panel of the tachometer if the ve­
hicle lighting or the ignition is on.
The lock-out button must be pressed when
changing from
Ρ to
R to
Ν to
3 to
At speeds in excess of 15 km/h (10 mph) a
hydraulically operated mechanical lock-out
avoids changing into R or P.
Operation
Before selecting a gear with the engine run­
ning and the car stationary, either the hand­
brake must be on, or the footbrake operated.
The brakes should only be released when
you wish to drive away, as the vehicle will
creep as soon as a gear is selected.
When the vehicle is standing, wait for the drive
to engage after selecting.
Do not accelerate until the drive has en­
gaged.
At speeds in excess of 50 km/h (30 mph) Ν
should not be selected. Should however Ν
be selected inadvertently during driving, the
accelerator should be released to allow the
engine to attain tick-over speed before the gear
is selected again. This avoids overloading the
fluid clutch.
R
It is extremely important for correct func­
Ρ
R tioning of the automatic gearbox that the
correct fluid level is maintained.
2
If there is no automatic transmission fluid in
the gearbox or the torque converter, the en­
gine must not be started, nor must the vehicle
be towed.
The automatic gearbox and the torque con­
verter are both filled with ATF, simultaneously.
The back axle is filled with hypoid oil. For filling
amounts see the chapter "Filling capacities".
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