SPARK PLUGS
Spark plugs should be removed and examined periodically. Replace worn, fouled or damaged spark plugs.
Use only recommended spark plugs with the correct gap setting.
| Spark Plug, Champion |
|---|
| QC10WEP @ 0.028 ± 0.003 in. (0.71 mm) |
- Remove spark plugs and inspect condition.
- Set spark plug gap on new, replacement spark plugs.
- Mark spark plugs for ground electrode orientation.
- Apply Electrical Grease to the ribbed portion of the spark plug ceramic and to the opening of the spark plug cover to prevent corrosion.
- Install spark plugs using “indexing” procedure.
Indexing
Spark plug indexing positions the ground electrode of the spark plug opposite the fuel injector nozzle.
Put an ink mark on the ceramic of the spark plug in line with the OPEN side of the ground electrode. This mark will be used to orient the spark plug with the OPEN side of the ground electrode facing the fuel injector.
- Ink mark
- Open side
Apply Triple-Guard grease to the gasket surface of the spark plug. Install spark plug and tighten to a torque of 15 ft. lbs. (20 N-m).
If the mark is in unshaded area do not tighten any more.
Spark Plug Indexing Diagram
- Unshaded area
- Shaded area
If the mark is in the shaded area, reset torque wrench to 30 ft. lbs. (41 N-m) and continue to turn until the mark is in the unshaded area.
If the mark does not reach the unshaded area before the torque of 30 ft. lbs. (41 N-m) is reached, the spark plug cannot be indexed for that cylinder. Try another spark plug and repeat the steps above.
