Porsche 928 Workshop Manual page 102

38
Automatic Transmission/Gears, Valve Body
928
Condition:
Transmission slips when moving off in 1st and 2nd gear, or moving off not possible in
forward gear. Reverse gear is still good.
Cause/Correction:
1. Service shift valve B 2. replacing shift valve housing if necessary.
2. Replace brake band B 2 piston
3. Adjust brake band 8 2 by installing a longer thrust pin.
Replace brake band in case or excessive wear or broken brake
band.
Condition:
Transmission slips during 2nd/3rd shift, or slips at first and then grabs hard.
Cause/Correction:
1. Check modulating pressure, adjusting if necessary,
2. Check whether temperature orifice is installed (see removing
and installing lower cover on page 38 131).
3. Replace shift valve housing.
4. Replace inner plates of clutch K 1. Repair clutch depending
on findings.
Condition:
Transmission slips during 3rd/4th shift.
1. Check modulating pressure, adjusting if necessary.
2. Replace shift valve housing.
3. Replace inner plates of clutch K 2. Repair clutch depending
on findings.
a
38 112 Troubleshooting
Printed in Germany