Spark Plugs and Wires
Lincoln LS
Lincoln Mark VIII
Lincoln Navigator

How do you change spark plugs in a Lincoln Mark 8?


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2008-02-20 18:18:02
2008-02-20 18:18:02

Start by removing the plastic cover over the engine (I just leave mine off). On the passenger side, remove the intake tube and the resonator. Follow the wires until you see them go underneath a cover attached to the valve cover by 4 bolts. Remove that, and there are the plugs. You will need a 10" extention to get to them, as they're deep in there. On the driver side, you'll see some electronics in your way and possibly the PCV hose. Just remove that, remove the cover again, and there are the other 4.

In addition to the above, I recommend getting one of those metal rods with the magnetic tip, so you will have an easier time extracting the plugs from the plug-wells once you unscrew them. They are available at auto parts stores for around $2.00.

I highly recommend the use of anti-seize compound for the plug threads. The threads on the Mark VIII's aluminum heads aren't difficult to strip, and a seized plug will make that more likely to happen.

Use dielectric grease on the wire-end of the spark-plug, to protect the ends of your spark-plug wires.

Finally, when it's time to install and tighten the plugs, be mindful that they don't need to be in real tight, just snug. Turn them till they seat in the head, then give them an additional 1/16 rotation. DO NOT GIVE THEM A HE-MAN TWIST or you'll be sorry. -JMiles_T

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According to one of Fords websites : For a 1973 Lincoln Mark IV , 7.5 liter / 460 cubic inch V8 engine : ( the spark plugs are gapped at .035 inch )

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Mark and remove plug wires. Remove spark plugs and install new plugs. Reattach plug wire to correct plug.

If you mean in the valleys when you look down and there is oil around the spark plugs then it's the o rings in the valve covers that need replacing. Removing the passenger cover isn't too bad but the driver's side is a pain.

I used Autolite spark plugs in my Mark VII. Autolite is the retail version of the factory Ford part. Same as ACDelco and GM. Im sure you've seen tons of different plugs out there and some of them are great I like at bosch platinum plugs but they are a waist of money unless 1) your car came with platinum plugs 2) You have or are planning ignition system upgrades. But for a stock car use factory plugs. Also make sure the plugs are gapped correctly. Even pre-gapped plugs, Ive seen pre gapped plugs almost .015 off the gap.

Open the trunk, remove the carpet lining and unscrew the black plugs and remove the burt out bulb.

The Mark Vlll transmissions will fit from 93-95 without re-pinning the electrical plugs.

Not unless you try to change the whole front end of the car.

0.54 and remember to use anti seize grease

30,000 miles is recommended for spark plug replacement on all Chrysler/Jeep vehicles, not just the Jeep Liberty. Not only are plugs recommended at 30,000 miles, shock absorbers are recommended as well. As a mechanic for the Chrysler/Jeep Corp., i can say with confidence that it is not entirely necessary to change plugs and shocks at the 30k mile mark. Basically, "If it ain't broke, don't fix it!" (however, i do recommend at least checking the plugs at 30,000 miles)

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They take the place of a distributor and there are two of them for each bank of the engine. Look at your engine and you will see two square things on the front of each side of the engine with 4 wires coming from it and they go to the spark plugs and that is how they fire.

Mark them first with a marker and change one at a time

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Hey there, I had the same problem once. I was trying to change the whole set of spark plugs when suddenly I couldn't change the last one (6th), so almost frustrated I read the service manual and I found what under the back seats there is a tool to help you to change them, they have the exactly size to make the change of the last spark plug. I hope this can help. Mark

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Just like you would do any other car, change and gap spark plugs and torque only to 10 ft. lbs. and only do the work on a cold engine, you don't want to strip the threads on the aluminum heads. Change the PCV valve, check the spark plug wires for cracks etc. and replace as needed. Look down the spark plug tube and if you see oil then the O rings are going bad in the valve covers. Look over the two coil packs and check for cracks etc. and replace as needed. This is for the 1st generation Marks, the second generation Marks (97-98) are a little different, they have coils on each of the spark plug wires. You didn't mention what Mark you have.

They are incorporated in each spark plug wire.

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