Spark Plugs May be Difficult to Remove on Lincoln Navigator

Problem Description and Possible Solution

Spark plugs in the Lincoln Navigator can be very difficult to remove.

Ford has issued a service bulletin (08-7-6) to address this issue, which includes a recommended procedure on how to remove the plugs. Failure to follow the recommended procedure can result in the one or more spark plugs breaking off in the cylinder head.

The recommend procedure is as follows. Using this procedure will greatly reduce the chance of breaking a spark plug.

1. Break the spark plugs loose when the engine is warm.
2. Turn each plug 1/8 to 1/4 turn and soak the treads with 1/2 to 3/4 teaspoon of Motorcraft Carburetor Tune-Up Cleaner or a quality penetrating oil. Do not try to remove the plugs at this time.
3. Let the threads soak for at least 15 minutes.
4. After the soak period, tighten and loosen each spark plug, working it back and forth until the turning effort is reduced. Then, you can remove the spark plug.

There are special tools available to remove the broken spark plugs and repair shops will often charge additional labor for the removal of each broken spark plug.

Problem Data
RepairPal Verified
Average mileage: 124,568 (98,324–175,000)
4 model years affected: 2005, 2006, 2007, 2008
13 people reported this problem
Viewing 1 - 3 of 3 comments
while trying to remove the spark plug the tip of the plug broke off in the engine head. on three plugs have to had the truck tow to a locate ford dealer. have always change my plugs to save a few dollars. not this time.