There should be a tiny notch on the back of the pulley. You may need to feel for it with your fingernail. Once you find it you should mark it with white paint.
A repair manual
55
Ford Escorts from 91 to present don't have timing marks because the timing is controlled by the engine computer.
the 91-94 sentra has a timing chain
91-73 = 18
To replace a broken key in a 91 Subaru ignition, you will need to contact a locksmith. The locksmith can cut a key to match your ignition.
109
Timing chain
subaru 91-legacy
no
in my 91 it is under the steering column
You cant "reset" the timing on these. It has computer controlled ignition timing. If there is a timing problem check the crank sensor.