Modulating Pressure, Measuring/Adjusting - Porsche 928 Workshop Manual

38
Automatic Transmission/Gears, Control
928
Modulating pressure, measuring
Note:
It is essential to measure the modu-
lating pressure and reset if neces-
sary, before testing any other
pressures. When the modulating
pressure is correctly set, the work-
ing pressure is produced of its own
accord.
On the dynamometer or on the road,
accelerate to approx. 140 km/h with
the selector lever at "D" and check
the reading on the pressure gauge
(with vacuum line interrupted).
Note:
When working on K-Jetronic engines,
disconnect the vacuum line from the
intake manifold and plug socket with
a suitable bolt (e.g. plug for test
connection on transmission).
Modulating pressure, adjusting
l.Remove rubber cover from vacuum-
control unit.
2.Pull the retainer out slightly
and adjust the setting screw
in the vacuum-control unit with
the retainer.
Note:
One full turn of the setting screw
changes the pressure by approx.
0.4 bar.
Clockwise:
Pressure is increased
Anti-clockwise:
Pressure is reduced
38 - 108
Checking Operation
XVI,1987
- Printed in Germany
a