Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE IGNITION SYSTEMREMOVAL AND INSTALLATIONSPARK PLUGSINSTALLATION
2009 Lincoln Navigator L RWD
Spark Plugs: Installation
2009 Lincoln Navigator L RWDSECTION Installation
- Adjust the spark plug gap as necessary. For the correct spark plug gap specification, refer to SPECIFICATIONS .
- Install the spark plug.
- Tighten to 12 Nm (106 lb-in).
- Install the ignition coil-on-plug. For additional information, refer to IGNITION COIL-ON-PLUG .
NOTE:
Only use hand tools when removing or installing the spark plugs or damage can occur to the cylinder head or spark plug.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.