Locate the #1 spark plug wire pole on your distributor cap. Some older inboard Mercruiser engines might have a reverse fire order so make sure to confirm your engine rotation. Just be sure and do the plugs and wires one at a time. I have done a couple of tune ups on my 92, and the hardest thing is twisting the cap around to remove and replace. Once the plug wires are off, and the hold downs unscrewed, the cap comes off with a little twisting and turning because of it being so recessed under the firewall. cap do the same, pull one wire and match it on the new cap. The Bosch W9DC0 plug is a 13/16" diameter, so you will need a 13/16" spark plug socket to accommodate these plugs. I would recommend, remove the distributor cap with all wires still attached, then change out the rotor (make sure the new rotor goes on in the same position as the old, it should be keyed, but the extra time spent being careful about the clock position will pay off). I was going to add that the tool kit spark plug wrench works pretty handy for getting to #6. Remember that Pontiac distributors turn counter-clockwise. Step 4: Remove spark plug wires: After you've marked the spark plug wires remove the spark plug wires from the distributor cap. Thanks! This is for any Pontiac engine made before 1979. Typically the distributor is held in place by two or three bolts or a few clips on the side of the cap. By doing them one at a time, you will not have to worry about accidentally switching the wires. Both the cap and rotor should only be a couple screws holding them in. Also suggest to do one project at a time, so yeah one could replace the distributor o-ring at the same time, but probably best to do plugs and wires, make sure it runs fine, and then do distributor. Doing them one at a time helps prevent mixing up the wires. Helpful 0 Not Helpful 0. Install cap, and all wires on distributor. Once you locate the cap, trace all of the wires into the spark plug locations. With the dist. Connect plug wires in firing order 1-8-4-3-6-5-7-2. Hook up a timing light to #1 plug wire. Good luck. Remove and replace one wire at a time, starting with the longest wire. The distributor cap on your engine is located towards the rear of the engine compartment. Step 5: Remove distributor cap: Once the plug wires have been removed, you'll be ready to remove the distributor cap. When removing wires from the spark plug or distributor cap, twist or rotate the boot to loosen it from the plug. After the spark plug wire connector is removed from the plug, get your spark plug socket out, along with ratchet and extension (if needed) and remove the plug from the cylinder head. That is now #1 plug wire. Each one will follow a path, using special wire clips that hold them in place. Removing the Old Spark Plug Wire Set. Learn how to reroute the spark plug wires with step by step instructions in this free auto repair video. Expert: Nathan McCullough Bio: … The rotor is pretty much idiot proof. Your manual can help you ID which pole is #1. Step 1 – Locate the distributor cap and begin removing the wire clips. V8 distributor cap spark wires off by one position « on: June 20, 2015, 10:34:06 AM » On my '65, the wires are installed in correct firing order on cap, but I noticed that plug wire #4 is not in same position as the shop manual (next to cap window). A 13/16th spark plug socket, ratchet and extensions with maybe a screwdriver or two should be all you need. The rotor simply pulls up and off. Replace your plug wires every 3 to 5 years or sooner if needed. Turn distributor body until rotor lines up with a sparkplug socket on cap. Changing or repairing a distributor cap in your car? 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