Porsche 928 Workshop Manual page 103

a
928
Automatic Transmission/Gears, Valve Body
38
Condition:
After installation, transmission has no power flow or fails after a brief time of operation,
Cause/Correction:
Torque converter not installed according to instructions.
Drive dogs do not engage accurately in drive gear of
primary pump.
Follow-up damage: Torque converter drive dogs and
primary pump will be destroyed.
Replace primary pump and, if necessary, torque converter.
Condition:
No power flow in all selector lever positions for a brief period immediately after starting
engine (especially when car had not been used for a while).
Cause/Correction:
Torque converter drains partially via leaky or defective
lubricating ring on drive shaft or via leaky lubricating
valve in shift valve housing.
1. Check lubricating ring on drive shaft, replacing if
necessary.
2. Check and clean lubricating valve in shift valve housing,
Condition:
No power flow in reverse gear.
Cause/Correction:
1. Check lined plates and seals on piston of brake band 3,
replacing if necessary.
2. Replace one-way clutch in gear set
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Printed in Germany VIII, 1984 Troubleshooting
38 113