Reply to "tumbler for doors 4907 - what Fiat part?"

Two of the trunk locks that have been sent to me for repair actually had nothing mechanically wrong with the locks. Nothing.

After 40 years of exposure to exhaust particles and road dust the trunk lock cylinder was essentially glued to its housing.

Soaking the assembly in lacquer thinner, several hours in an ultrasonic cleaner, careful removal of the pin retaining the lock cylinder in the housing and judicial use of force finally allowed the cylinder to be freed from the housing. After thoroughly cleaning all surfaces and reassembly, the lock worked perfectly fine.

As there is no access to the rear of the lock cylinder the only way to remove one that is stuck is to rely on Newtons law that says an object in motion tends to remain in motion.

I found a 12 point, 18 mm socket was the right size to capture the housing but allow the lock cylinder to fit within the 12 points. With the socket and trunk lock cupped in my hand, repeated hard smashing of everything into my workbench eventually saw the lock cylinder slowly emerging from the housing.

Larry