Electrics & Electronics: Ignition Systems: Ignition procedures
Checking ignition timing
 
It is not necessary for the technician to alter the timing from the manufacturer's specifications. In some cases, serious damage could result.
 
Checking & changing a spark plug
 
The leads which come from the distributor must be removed from the spark plug in such a way that you can identify which cylinder they belong to.
 
Removing & replacing contact points The contact breaker points are normally found in the base of the distributor below the distributor cap and the rotor.