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There are several areas that could go wrong. The lock cylinder, the short forked arm that connects the lock cylinder to the inner door latch, and the actuator rod to the lock knob on the door top interior panel. Replacement parts for the plastics that hold actuator rods are available through many online Porsche sources.

If the key turns and the door unlocks, butnothing happens with the lock knob, it is likely one of these has come undone. The other possible culprit is if the short forked arm on the back of the lock cylinder. If the key turns and the lock does not function, this will likely be At Fault. I have not seen one break off, but it does have a single screw holding it on. Should the screw loosen it would come off or lose alignment and not function.

If the key does not turn I would look to either a siezed inner lock mechanism, which can be lubricated or replaced, or a faulty lock cylinder. The cylinder will often become corroded from age and lack of use.

To repair any of these you need to remove the inner door panel. The actuators are in plain sight. To fix any issue with the lock cylinder or door handle itself, remove the 2 8mm nuts securing the door handle and remove the handle. Once removed, take out the single Phillips head screw holding the forked actuator arm to the back of the knob. Once removed, insert the key into the lock, and from the back, push the lock cylinder out. It can then be cleaned and lubricated.

Be careful, if you remove the individual locking pins after pulling the lock cylinder, you MUST put them back in the same locations or your key will no longer fit the lock, you will have essentially "re-keyed" the lock.

There are a number of free Porsche online forums for advice, many also have parts for sale sections. I tend to use Pelican Parts. Even if a part for your car is no longer available at the dealer, you would likely find a used replacement free or cheap from a fellow Porsche owner.

Enjoy your car.

Vince

Delaware

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Q: How do you repair a 1967 Porsche 912 door lock?
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