Distributor Cap Replacement Guide for the 1971-1973 International 1310
Everything you need to know to get the right distributor cap for your vintage IH truck and restore its ignition performance.
- A failing distributor cap is a common cause of misfires, rough idle, and starting problems on a 1971-1973 International 1310.
- Always replace the distributor rotor at the same time as the cap.
- Pay for quality; a premium cap with brass contacts from a brand like Standard Ignition is a worthwhile investment for reliability.
- Confirm if your old cap uses clips or screws before ordering a new one to ensure you get the right part.
Signs of a Failing Distributor Cap on Your International 1310
A distributor cap is a wear item, meaning it won't last forever. The plastic can crack from heat and age, and the metal contacts inside wear down or build up corrosion. When this happens, the spark your engine needs to run properly gets weak or misdirected. Owners often report these issues when a cap is going bad.
- Engine Misfires: The truck may buck or jerk, especially when accelerating or climbing a hill. This happens because a cylinder isn't getting a consistent spark.
- Rough Idle: You might feel a shaking or vibration when the truck is running but not moving. This can be caused by worn contacts inside the cap.
- Hard Starting or No Start: A cracked or moisture-filled cap can prevent the engine from getting the strong spark it needs to start, especially in damp weather.
- Unusual Noises: Squealing or clicking sounds from the distributor area can indicate a problem with the cap or the rotor inside it.
Choosing the Right Aftermarket Distributor Cap
Finding a new original equipment (OEM) distributor cap from International for a truck from the early 1970s is nearly impossible. All available new parts are from the aftermarket. The good news is that modern manufacturing and materials often mean today's aftermarket parts are as good as, or even better than, the originals.
When shopping, you'll likely see two main quality tiers:
- Premium Brands (e.g., Standard Ignition): Brands like Standard Motor Products (SMP) have a long-standing reputation for quality. Their premium lines often feature brass contacts, which are more conductive and corrosion-resistant than the aluminum contacts found on cheaper caps. They also tend to use higher-quality plastics that resist heat and cracking better.
- Standard/OE-Match Brands (e.g., Walker Products): These brands aim to meet or exceed the original factory specifications. They provide a reliable, cost-effective option that functions just like the original part. Walker Products, for example, highlights their use of high-dielectric materials to prevent spark loss.
For a classic truck like the 1310, investing in a premium cap with brass contacts is a smart choice for long-term reliability and performance.
Common Ordering Mistakes
While it's a simple part, a couple of things can go wrong when ordering. Before you buy, check your existing distributor cap to confirm how it is attached. Some caps use spring clips on the side, while others are held on by screws from the top. Ordering the wrong type is a common mistake. Also, ensure the cap you are ordering is for a V8 engine, as this determines the number of spark plug wire terminals.
Distributor Cap Replacement Cost for 1971-1973 International 1310
This is one of the more affordable repairs you can make. The job is simple and suitable for a DIY mechanic with basic tools.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Distributor Cap & Rotor Kit | $24 - $52 |
| Shop Labor | $60 - $120 |
| Total Estimated Cost | $84 - $172 |
Frequently Asked Questions
Is this a difficult job to do myself?
No, this is a great beginner-level job. It typically requires only a screwdriver or a small wrench. The difficulty is a 1 out of 5. The key is to transfer the spark plug wires from the old cap to the new cap one at a time to avoid mixing up the firing order.
What is the firing order for my International V8?
For the International SV-series V8 engines (like the 304), the distributor rotation is clockwise and the firing order is 1-8-4-3-6-5-7-2. When you place the new cap on, make sure the #1 wire goes to the terminal pointing towards the #1 cylinder.
Are there any recalls or TSBs for the distributor cap on my truck?
No. There are no active recalls or Technical Service Bulletins (TSBs) from the NHTSA for this part on a 1971-1973 International 1310. This is normal for a vehicle of this age, as these systems predate modern recall databases.
Should I use dielectric grease?
Yes. It's a good idea to apply a small amount of dielectric grease to the inside of each spark plug wire boot before connecting it to the new cap. This helps seal out moisture and prevents the boots from getting stuck, making future tune-ups easier. You can also put a dab on the metal contacts to help prevent corrosion.
Technical Specifications
Engine Type: V8 Distributor Rotation: Clockwise Firing Order: 1-8-4-3-6-5-7-2
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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.