1986 Toyota Corolla DISTIBUTOR

Set engine to TDC #1, rotor will be pointing to #1 wire on dist.
Mark the orientation of rotor, pull off cap. Loosen dist. hold down bolt, remove bolts (there may be two), pull dist. out, remove old O ring, install new one.
Most Toyota distributors don't have a gear on the dist. so they can be put in only one of two ways, correctly, or 180 degrees out.