Introduction
The distributor rotor delivers voltage from the ignition coil to each spark plug wire inside the distributor. Many ignition issues can be traced back to the distributor rotor and/or cap. Because of this, it's a good idea to replace the distributor cap whenever you replace the rotor.
Tools
Parts
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            Pull straight up on the ignition coil wire in the center of the distributor cap to disconnect it. 
 
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            Pull straight up on the boot of the first spark plug wire to disconnect it from the distributor cap. 
 
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            Install the spark plug wire onto the new distributor cap and make sure it is seated properly. 
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            Continue to transfer each spark plug wire to the new distributor cap, maintaining the same arrangement of wires on the cap. 
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            Once all of the spark plug wires have been installed on the new distributor cap, set the cap aside. 
 
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            Use a flathead screwdriver to release the clip securing the distributor cap. 
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            Remove the old distributor cap. 
 
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Place the new distributor rotor and cap back in the same orientation that the old ones were removed.
One comment
I need to know how to install the whole distributor in the Volvo 240 DL. Do I still need to get #1 on TDC COMPRESSION and line the distributor/rotor facing #1 spark plug? Please help