Cylinder numbering on the engine block typically starts at the front (closest to the radiator) on the passenger side (right side in North America) and continues in a sequential manner toward the rear of the engine, alternating sides. However, *it's crucial to verify this on your specific engine*. There can be slight variations in how Ford numbered them, though the firing order remains consistent. The best way to confirm is to:
1. Consult your owner's manual: This is the most reliable source of information.
2. Look at the engine block itself: Sometimes the cylinder numbers are cast directly into the block.
3. Check a reputable online parts catalog: Use the engine's VIN to find a diagram.
Distributor Cap Wire Positions:
The distributor cap wire positions directly correspond to the firing order. However, since there is no single "standard" for how manufacturers position the cap terminals, you must visually check your distributor cap and rotor. The rotor points to the cylinder firing next.
To determine the wire placement on your distributor cap:
1. Locate the #1 cylinder: Determine which cylinder is number one using the methods mentioned above.
2. Identify the rotor position: With the engine at TDC (Top Dead Center) for cylinder #1, the rotor should point to the #1 terminal in the distributor cap.
3. Follow the firing order: Following the 1-5-3-6-2-4 firing order, trace the wires from the distributor cap to the appropriate spark plugs.
Caution: Always disconnect the negative battery terminal before working on any ignition system components. Improper wiring can damage the ignition system and potentially harm the engine. If you're not comfortable performing this task, consult a qualified mechanic.
