Porsche 928 Workshop Manual page 794

38
Auromaric Transmission / Gears, Valve Body
928
4. Position selector lever al "D". floor acceleraror
pedal wirh rigbr foor and check whether speci-
fied srall speed is reached.
Stall speed must be 2400 + 200 rpm.
Note
If srall speed drops by approx. 400 to 700 rpm
below specified value. one-way clutch in torque
convener is slipping.
11~ srall speed is faster than specified value by about
300 rpm. slip is in transmission.
If srall speed is correcr alltl lop speed is still nor
reached, one-way clurcl, is locking in both direc-
Cons or has seized. This 'xi!1 usually be noticed
during fast highway driving by ATF leaking rhrougli
the vent.
The srall speed will drop by app~ox. 125 rprn for
each 1000 merers/3900 feer alrirude above sea
level because of a drop in engine power.
Even excessively high outside lemperarures could
cause stall speed to drop slightly below rhe mini-
mum value.
38 - 4 Checking Transmission Operation
Printed in Germany