What is the torque on the spark plugs on a Ford Cmax?
The spark plugs on a Ford C-Max are torque-specific and depend on the engine variant. For the common C-Max Hybrid’s 2.0L Atkinson-cycle engine, the spec is about 12 N·m (9 ft-lb). Non-hybrid petrol variants typically fall in the 20–25 N·m (15–18 ft-lb) range. Always confirm the correct value for your exact year and engine in the official Ford service manual.
The Ford C-Max has spanned different markets with multiple powertrains, meaning spark plug torque is engine- and year-specific. Using the wrong torque can lead to poor sealing, damaged threads, or pre-ignition. This article outlines the likely ranges and explains how to locate the precise figure for your exact vehicle.
Engine variants and torque specs
Below are the torque figures typically associated with the two main engine families found in C-Max models. Note that exact values can vary by year, spark plug type, and replacement procedure.
- Ford C-Max Hybrid (2.0L Atkinson-cycle I4): Spark plugs are typically torqued to 12 N·m (9 ft-lb).
- Ford C-Max (non-hybrid) with 1.6L/2.0L petrol engines (market-dependent): Roughly 20–25 N·m (15–18 ft-lb), depending on plug type and year.
These figures provide a practical baseline, but the exact specification from Ford's workshop data should be used for the final torque setting.
Why correct torque matters and how to apply it
Correct torque ensures a proper seal, prevents plug loosening, and protects the cylinder head. When installing plugs, clean the threads, use the recommended plug type, and torque with a calibrated torque wrench to the specification for your engine. For copper-core, iridium, or platinum plugs, the torque might be the same, but ensure you follow the plug manufacturer’s installation guidelines and Ford's recommendations.
Summary
Torque on spark plugs in the Ford C-Max varies by engine variant. For the popular 2.0L Atkinson-cycle hybrid, expect about 12 N·m; for most petrol non-hybrid engines used in other markets, the range is roughly 20–25 N·m. Always verify the exact figure in the official Ford workshop manual for your vehicle’s year, engine, and plug type to avoid damage or leaks.
