Before You Begin:
* Safety First: Disconnect the negative battery cable before starting any work on the ignition system.
* Repair Manual: Obtain a repair manual specific to your 1979 Chevrolet. This will provide detailed instructions, torque specifications, and diagrams crucial for successful replacement. Chilton and Haynes manuals are readily available.
* Tools: You'll need basic tools including wrenches (socket and open-end), screwdrivers, possibly pliers, and potentially a distributor holding tool.
General Steps (May Vary):
1. Locate the Distributor: The distributor is typically located on top of the engine, near the firewall. Your repair manual will show its exact location.
2. Disconnect Components:
* Ignition Wires: Carefully disconnect the spark plug wires from the distributor cap. Make a note of their order (or take a picture) to ensure correct reconnection. Mis-wiring can cause misfiring or damage.
* Vacuum Advance Line (if applicable): Disconnect any vacuum lines connected to the distributor.
* Electrical Connector: Disconnect the electrical connector from the distributor.
3. Remove the Distributor:
* Rotor: Some distributors have a rotor that needs to be removed before removing the distributor itself.
* Distributor Hold Down: There will usually be a clamp or bolt holding the distributor in place. Loosen and remove this.
* Rotation: You may need to carefully rotate the engine to align the distributor shaft with the timing marks. Your repair manual will detail this process; it's critical for proper engine operation.
* Removal: Gently lift the distributor out of the engine block.
4. Installation of the New Distributor:
* Alignment: Carefully align the new distributor with the engine block, ensuring it's seated correctly. The repair manual will specify how to align the distributor shaft with the oil pump drive.
* Installation: Gently lower the distributor into place.
* Tightening: Tighten the hold-down clamp or bolt to the manufacturer's specifications (found in your repair manual).
* Reconnect Components: Reconnect the electrical connector, vacuum lines, and spark plug wires in the order you noted earlier.
5. Timing: This is a crucial step that requires either a timing light or a scan tool. Improper timing can severely damage your engine. Your repair manual will detail the timing procedure for your specific engine.
6. Reconnect Battery: Reconnect the negative battery cable.
7. Test Run: Start the engine and check for proper operation.
Important Considerations:
* Distributor type: There are different types of distributors (electronic, points, etc.). Ensure the replacement is the correct type for your engine.
* Rotor and Cap: Consider replacing the rotor and distributor cap at the same time as the distributor. They are wear items and often need replacement with an aging distributor.
* Professional Help: If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Incorrect installation can lead to engine damage.
This is a general overview. Again, you absolutely MUST consult a repair manual specific to your 1979 Chevrolet model before attempting this repair. Failing to do so could result in engine damage or personal injury.
