Two of the most common questions we get are; what type of spark plug for my 2001 Dodge Ram 1500 3.9-liter V6 engine, or what brand of spark plug is best for my full-size pickup truck? The best kind or type of spark plug has already been determined by DaimlerChrysler automotive corporation. Daimler AG has specified in their 2001 Dodge Ram dealership service manual which plug type to use for each engine model and the plug electrode gap, or spark plug gap.
Spark Plug Description
A spark plug is an electrical device inserted into an opening on a cylinder head so as to emit a spark of electricity and ignite the explosive mixture in an internal-combustion engine. As the name implies, “spark” emit sparks of electricity and “plug” fills a threaded hole on the cylinder head. The electric spark causes the compressed fuel and air to explode turning mechanical power into motion.
Spark Plug Type
The vehicle manufacturer recommend that newer Dodge Ram pickup trucks use NGK brand spark plugs. However, the service department strictly advise the use of Champion RC12LC4 copper plus replacement spark plugs for 2001 3.9-liter engines.
| ENGINE (2001 MODEL) | PLUG TYPE | ELECTRODE GAP |
|---|---|---|
| 3.9L V6 | RC12LC4 | 1.01 mm (.040 in.) |
| 5.2L/5.9L V8 | RC12LC4 | 1.01 mm (.040 in.) |
| 8.0L V10 | QC9MC4 | 1.14 mm (.045 in.) |
The printed numbers and letters on a spark plug define its classification, design and other characteristics. The letter “R” on a 3.9L plug identifies it as a resistor type spark plug. The “Q” refers to inductive type spark plugs, which are used on 8.0L V-10 engines. Additional characters specify the shell type, heat range application, gap dimension and firing end design.
Torque Specifications
| DESCRIPTION | N·m | Ft. Lbs. | In. Lbs. |
|---|---|---|---|
| Spark Plugs (all engines) | 41 | – | 30 |
Never install a spark plug of a different type. A spark plug that is too long can cause severe engine damage. A longer spark plug can make contact with moving parts and brake off or flatten the electrode. A spark plug that is shorter than what is recommended will result in poor fuel economy and spark plug fouling.
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