Here's a breakdown of the process:
1. Preparation:
* Gather your tools: You'll need a socket set (likely metric), screwdrivers (Phillips and possibly flathead), a point file (very fine), a gap gauge (or feeler gauge), a new set of points, possibly a rotor (it's good practice to replace it with the points), and a wire brush for cleaning. A service manual for your specific Datsun model is highly recommended.
* Locate the distributor: This is usually under the distributor cap on the engine.
* Disconnect the negative battery cable: This is crucial to prevent accidental shorts and electrical shock.
2. Removing the Distributor Cap:
* Carefully remove the distributor cap. Note the position of the wires; take a picture or carefully diagram them to ensure correct reinstallation. There are usually markings on the cap and distributor body to aid in this.
3. Accessing the Points:
* Once the cap is off, you'll see the rotor. The points are usually located under a small plate or cover secured by one or two screws. Remove these screws carefully and remove the cover.
4. Removing the Old Points:
* You'll see the points assembly. There will be a screw holding it in place. Loosen and remove this screw. The points might be slightly fragile, so handle them with care.
5. Inspecting and Cleaning:
* Before replacing, inspect the condenser (a small cylindrical component usually attached to the points). It's often recommended to replace it with the points, as it's a relatively inexpensive part that can fail and damage the points.
* If you're only replacing the points, carefully clean the contact points with a fine point file. Only use very light strokes to avoid damaging the points further.
6. Installing the New Points:
* Carefully install the new points. Make sure the contact points are clean and make good contact with the points plate.
* Secure it using the screw you removed. Ensure the screw is tightened correctly, but don't over tighten.
* Reinstall the cover.
7. Setting the Point Gap:
* This is crucial. Use your gap gauge to set the gap according to the specifications in your Datsun's service manual. The gap is usually very small (measured in thousandths of an inch or millimeters). Incorrect gap will lead to poor engine performance or starting problems. Carefully adjust the gap using the adjustment screw typically found on the points assembly.
8. Reassembling:
* Reinstall the distributor cap, ensuring that the rotor is aligned and the wires are connected correctly to their original positions. Refer to your markings or diagram.
* Reconnect the negative battery cable.
9. Testing:
* Start the engine and listen for any unusual sounds or notice any signs of poor running. If the engine runs poorly, recheck the point gap and wire connections. A poorly adjusted point gap will lead to erratic idling, stalling, and poor performance.
Important Notes:
* Service Manual: This is absolutely essential. It will have diagrams, torque specifications, point gap settings, and other critical information specific to your 1971 Datsun pickup.
* Electronic Ignition: Some 1971 Datsun pickups might have had optional electronic ignition systems. If this is the case, the process is completely different and involves replacing the electronic ignition components rather than points. Check your vehicle for electronic components before starting the repair.
* Professional Help: If you're uncomfortable with any of these steps, it's best to take your vehicle to a qualified mechanic. Incorrectly adjusted points can damage the distributor and other engine components.
This is a general guide, and the exact procedures may differ slightly depending on your specific engine and Datsun model. Always consult a service manual for your vehicle.
