Distributor Cap Replacement Guide for the 1968 International 1000C
Keep your classic International's ignition system in top shape by understanding when and how to replace your distributor cap.
- A bad distributor cap will cause noticeable running issues like misfiring, rough idling, and hard starting.
- For a 1968 model, new aftermarket parts are the only viable option; OEM parts are no longer produced.
- Visually inspect the cap for cracks and corrosion; this is the most effective diagnostic method for this vehicle.
- When replacing, swap spark plug wires one at a time to ensure the firing order remains correct.
Signs of a Failing Distributor Cap on Your 1000C
A distributor cap is a wear-and-tear item. Over time, the high voltage and heat can cause cracks, corrosion, or carbon tracking, which is a tiny line of carbon that creates an unwanted path for electricity. When the cap starts to fail on your International 1000C, you'll notice some clear signs.
- Engine Misfires: The truck may jerk, stumble, or buck as you accelerate. This is often one of the first signs.
- Rough Idle: When stopped, the engine may shake or vibrate more than usual. This can happen when the terminals inside the cap get corroded or burnt.
- Starting Problems: You might find the engine cranks for a long time before it starts, or it might not start at all. This can be worse in cold or damp weather.
- Stalling and Backfiring: A bad cap can interrupt the power to the spark plugs, causing the engine to stall unexpectedly.
Visual Inspection is Key
On a vintage truck like the 1968 1000C, the best way to check the distributor cap is to look at it. Remove the two clips holding it down and inspect the inside and outside for cracks, moisture, or white, crusty corrosion on the metal terminals. Check the center carbon button to ensure it's intact.
Choosing the Right Aftermarket Distributor Cap
For a 1968 vehicle, finding a new original equipment (OEM) distributor cap from International Harvester is highly unlikely. Your only option is the aftermarket. Fortunately, reputable brands have been making these parts for decades.
Available Brands:
- Standard Ignition (SMP): A well-known aftermarket brand that has been around for a long time. They are generally considered a quality choice for ignition components. Their standard line (often in a red box) is a reliable option.
- Walker Products: Another established aftermarket manufacturer.
Brass vs. Aluminum Terminals
When choosing a cap, look for one with brass terminals if possible. Brass is a better conductor and is more resistant to corrosion than the aluminum terminals found on some budget-friendly options. This can lead to a longer service life and more consistent performance.
Distributor Cap Replacement Cost for 1968 International 1000C
Replacing the distributor cap is an affordable and straightforward job. It's a good idea to replace the distributor rotor at the same time, as they wear out together.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Distributor Cap | $19.01 - $51.85 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
How often should I replace the distributor cap on my 1968 1000C?
Distributor caps are considered a regular maintenance item. It's a good practice to inspect it annually and replace it along with the rotor during a major tune-up or every 20,000-30,000 miles, whichever comes first.
Is it difficult to replace the distributor cap myself?
No, this is a very DIY-friendly job. It typically involves unclipping the old cap, carefully swapping the spark plug wires one by one to the new cap to maintain the correct firing order, and clipping the new cap in place. No special tools are needed beyond a screwdriver.
What is the firing order for my International truck?
Maintaining the correct firing order is critical. Before removing any wires, it's wise to label them with their corresponding cylinder number. If you're unsure, you may need to consult a service manual for your specific engine (e.g., V8 or 6-cylinder) to confirm the correct wire placement. Misplacing even one wire will cause the engine to run poorly or not at all.
Are there any recalls for the 1968 International 1000C ignition system?
A search of the National Highway Traffic Safety Administration (NHTSA) database shows no recalls specifically related to the distributor cap or ignition system for the 1968 International 1000C. Recalls for this model year were related to braking components.
Technical Specifications
The key specification is the engine type (e.g., V8 or 6-cylinder), which determines the number of terminals on the cap.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.