Tools You'll Need:
* Timing Light: Essential for this procedure.
* Socket Wrench and Extensions: To remove the distributor cap and possibly access the timing cover.
* Spark Plug Wrench: Might need to remove a spark plug for easier access to the timing mark (depending on engine access).
* Flashlight: To illuminate the timing marks.
* Wrench for adjusting the distributor (if needed): Often a locking wrench or a special distributor wrench.
* Repair Manual (highly recommended): Your specific engine's timing specs are critical.
Procedure (General - consult your manual!):
1. Safety First: Disconnect the negative battery cable to prevent accidental shorts.
2. Locate Timing Marks: The timing marks are typically found on the harmonic balancer (the pulley on the crankshaft) and the timing cover. Your repair manual will show you exactly where they are. These marks must be clearly visible. Clean them if necessary.
3. Find TDC (Top Dead Center) on Cylinder #1:
* With the distributor cap removed: The repair manual will have instructions specific to your engine on how to accurately find TDC on cylinder #1. It often involves turning the engine by hand (using a wrench on the crankshaft bolt), checking the position of the piston, and making sure both timing marks align.
4. Connect the Timing Light: Clip the timing light's inductive clamp around a high-tension ignition wire (usually a spark plug wire) for cylinder #1. Connect the timing light's power leads to the battery.
5. Start the Engine: With the engine running, point the timing light at the timing marks on the harmonic balancer. The timing light will "freeze" the marks, allowing you to see where the crankshaft is at a particular point in the ignition cycle.
6. Read the Timing: Compare the position of the timing marks indicated by the timing light to the specified timing for your engine (found in your repair manual). The specification will be given in degrees Before Top Dead Center (BTDC).
7. Adjusting the Timing (If Necessary): If the timing is off, you may need to loosen the distributor clamp and rotate the distributor slightly to adjust the timing. Your manual will guide you on how to perform this step correctly (e.g., adjusting clockwise to advance the timing, counterclockwise to retard it). Only make small adjustments at a time. Re-check the timing after each adjustment.
8. Reconnect and Test: Once the timing is set correctly, tighten the distributor clamp, reconnect the negative battery cable, and test-drive the vehicle to ensure smooth operation.
Important Considerations:
* Distributor Condition: A worn or malfunctioning distributor can lead to inaccurate timing readings.
* Vacuum Advance: Ensure the vacuum advance mechanism on the distributor is working properly, as it affects timing at different engine speeds.
* Engine Speed: The timing should be checked at idle speed (typically 600-800 RPM) unless the manual specifies otherwise.
* Professional Help: If you are uncomfortable performing this procedure, take your vehicle to a qualified mechanic. Incorrect timing can damage your engine.
This is a general overview. Always refer to your 1989 Ford Tempo repair manual for precise instructions and specifications. Incorrect timing can cause serious engine damage. If you are not experienced with this type of work, it's best to have a professional perform the timing check and adjustment.
