Lockdown has given me the opportunity to fix one job that had been annoying me but had been put on the ‘to do’ list as I was not sure how the issue was to be fixed!
When I put my green MGB on the road a couple of years ago the ignition key would only operate in the ignition and glove box – it would not operate either the door or boot locks, and I had no key for these, as they came from different ‘parts cars’.
A search on Google and I was ready to attack the problem. First the locks had to come out of the car. The boot lock is easy, just unscrew the internal large locking ring holding the lock and handle to the boot lid and away it came. Door locks came out after removing the waist rail, window winder, door handle, door pull and the multitude of screws holding the door card to the door.
Mine is a pull handle car, and the lock is held in the door by a large clip on the inside, and after removing this the lock together with a connecting rod simply pulls out. (Push button handle cars have a slightly different system, but the cylinder and barrel operate in the same way).
The connecting rod is held onto the lock cylinder by a circlip, then another circlip holds the cylinder in the barrel. The boot lock has a small bolt holding an actuating lever onto the end of the lock cylinder, then again a circlip holds the cylinder in the barrel.
With the cylinders removed it is easy to see how the locks work when the key is inserted, and I found that two of the cylinders operated correctly with the ignition key, but a build-up of dirt was stopping the cylinder rotating in the barrel, so a quick clean fixed two of the three!