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

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.

Answer #2

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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First answer by ID1173935221. Last edit by JMiles T. Contributor trust: 11 [recommend contributor]. Question popularity: 57 [recommend question]

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