Here's what you need to do:
1. Find the timing marks: Locate the timing marks on the engine's harmonic balancer (the pulley at the front of the crankshaft) and the timing pointer on the engine block. Your engine's manual or a reliable online resource (like a Haynes or Chilton manual specific to your year and model) will show you where to find these.
2. Set the engine to Top Dead Center (TDC) on the #1 cylinder: This is the most critical step. With the distributor *removed*, carefully rotate the engine (using a wrench on the crankshaft bolt) until the #1 cylinder piston is at TDC on the compression stroke. You'll need to verify this using the timing marks. There are usually markings on the harmonic balancer that align with the timing pointer when the piston is at TDC on the compression stroke. Get this step right! Incorrect TDC will result in poor engine performance at best, and potentially engine damage.
3. Install the distributor: Carefully align the distributor so the rotor points towards the correct cylinder (usually #1, but double check your engine's specifications), making sure it's fully seated. You may need to slightly rotate the distributor to align the rotor correctly. The distributor should drop in to a well defined location.
4. Re-connect the electrical components: Reconnecting the ignition coil, cap wires, and other parts.
5. Check timing with a timing light: This is *essential* for accurate timing. A timing light will show you the timing advance. Your engine manual will specify the correct timing at idle (typically around 5-10 degrees BTDC but this can vary). You may need to slightly adjust the distributor's position (rotate it very slightly) to achieve the correct timing using the timing light.
Important Warnings:
* Do not attempt this if you are not mechanically inclined. Incorrectly installing the distributor can lead to engine damage, including bent valves.
* Consult a repair manual. A Haynes or Chilton manual for your specific year and model Astro van is invaluable. It will provide diagrams and detailed instructions.
* If you're unsure, take it to a qualified mechanic. This is not a job for a beginner.
The "put it back in time" phrase implies a simple solution, but there isn't one. Accurate timing requires precision and careful attention to detail. Following the steps above, using your vehicle's repair manual, and using a timing light are absolutely necessary for a successful repair.
