Here's what you MUST do:
1. Find the timing marks: Locate the timing marks on the crankshaft pulley (usually a notch or pointer) and on the timing cover (a mark or indicator). You'll need to turn the engine (usually by hand with a wrench on the crankshaft bolt) to align these marks to the engine's Top Dead Center (TDC) for cylinder #1 on the compression stroke. Your owner's manual or a repair manual specific to your vehicle will show you exactly where these marks are.
2. Check the distributor rotor: Note the position of the rotor. It should point towards a specific cylinder in the firing order (usually #1). Again, consult your repair manual for the firing order of your specific engine.
3. Install the distributor: Carefully install the distributor, ensuring the drive gear meshes correctly with the engine's distributor gear. Do not force it.
4. Rotate the distributor: Now, very slowly rotate the distributor (clockwise or counterclockwise) until the rotor points to the correct cylinder (#1, as determined in step 2). This is the critical part. There will be only one position where the rotor correctly aligns with the #1 cylinder at TDC. If the engine has already had the distributor removed before, the correct position may be difficult to find.
5. Consult a repair manual: A factory service manual or a reputable repair manual specific to your 1990 Ford Thunderbird 3.8L V6 is absolutely crucial. It will have diagrams, specifications, and instructions showing the correct distributor positioning, timing marks, and firing order. Trying to do this without a proper manual increases the risk of significant engine damage.
Do not rely on guesswork. The consequences of installing the distributor incorrectly can range from a misfire to bent valves. Investing in a repair manual will save you time, frustration, and potentially expensive engine repairs.
