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911 1974 blown pulley seal

Engine

Vehicle Information: Model: 911 Targa; Year: 1974; Body Type: Targa; Total Mileage: Unk;

After engine rebuild when one revs the engine the pulley seal starts leaking. Two seals were tried. Could this be caused by a stuck pressure piston in case. Idle pressure is approx. 20 psi according to dash gauge. Goes up to 60-70 psi when you rev engine. If pressure piston is stuck-what is best way to remove from case? What other possibilites for this problem?

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