Choosing the Right Distributor Cap for Your 1959-1960 International B122
Keep your classic International Harvester running smoothly with the correct new distributor cap.
- A failing distributor cap causes misfires, rough idle, and hard starting.
- New aftermarket caps from brands like Standard Ignition and Walker Products are the best choice for your B122.
- For best performance and longevity, choose a cap with brass contacts over aluminum.
- Always replace the distributor rotor at the same time as the cap for a complete repair.
Signs of a Failing Distributor Cap on Your International B122
The distributor cap is a wear-and-tear item. Over time, the plastic can crack and the metal contact points inside can corrode or wear down. When this happens, you'll notice problems with how your truck runs. These symptoms often start small but will get worse.
Common Failure Symptoms:
- Engine Misfires: Your truck may buck or jerk while driving as cylinders fail to fire correctly.
- Rough Idle: You might feel shaking or vibration when the truck is running but not moving.
- Hard Starting: The engine may crank for a long time before it starts, or it might not start at all.
- Stalling or Backfiring: A faulty cap can cause the engine to stall unexpectedly or make popping sounds from the exhaust.
Choosing an Aftermarket Distributor Cap
For a classic truck like the 1959-1960 B122, finding a “New Old Stock” (NOS) OEM part is very difficult and often expensive. The most practical and reliable choice is a new aftermarket part. Modern manufacturing can offer better materials than the original parts from over 60 years ago.
When shopping for a new cap, the main difference in quality comes down to the materials used for the electrical contacts inside.
- Standard/Aluminum Contacts: These are found on budget-friendly caps. They work fine but will wear out faster and are more prone to corrosion.
- Premium/Brass Contacts: Higher-quality caps use brass for the contacts. Brass is a better conductor of electricity and resists corrosion, leading to a longer lifespan and more reliable performance.
Available Brands for the International B122
Two common, reliable brands you will find for your truck are Standard Ignition and Walker Products.
- Standard Ignition (SMP): A well-respected name in aftermarket ignition parts, Standard often provides components that meet or exceed original specifications. They are a trusted choice for a tune-up.
- Walker Products: Another established aftermarket manufacturer, Walker Products emphasizes quality and fit, engineering their caps with durable, heat-resistant materials.
Both brands offer a dependable replacement for your original cap. For maximum durability, choosing a version from either brand with brass contacts is recommended.
Pro Tip: Replacing Your Cap
Replacing the distributor cap is a simple job you can do at home. The cap is usually held on by two clips. The most important step is to transfer the spark plug wires from the old cap to the new cap one at a time. This ensures you keep the correct firing order, which is essential for the engine to run. The firing order for the common International six-cylinder engine is often cast into the intake manifold for reference.
Distributor Cap Replacement Costs for 1959-1960 International B122
The cost for this part is very reasonable. The main variables are the quality of the aftermarket part and whether you install it yourself.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $24.44 - $34.65 |
| Shop Labor | $50 - $100 |
| Total Professional Replacement | $75 - $135 |
Frequently Asked Questions
Are there any recalls for the 1959-1960 International B122 distributor cap?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or technical service bulletins (TSBs) for the distributor cap on this vehicle. This is normal for a part of this type and age.
Should I also replace the distributor rotor?
Yes. The distributor rotor is the spinning part inside the cap that actually distributes the spark. It wears out at the same rate as the cap. For a complete and effective tune-up, you should always replace the cap and rotor at the same time.
What is the difference between a cap with aluminum contacts and one with brass?
Caps with brass contacts are considered premium because brass is a better electrical conductor and is more resistant to corrosion than aluminum. This results in a stronger, more consistent spark and a longer service life for the part.
How do I make sure I get the right cap for my truck's engine?
The 1959-1960 International B-series trucks were offered with different engines, including an inline-six and a V8. The distributor cap is engine-specific. Most aftermarket parts for the B122 are for the common International Harvester six-cylinder engine, like the BD-220 or BD-240. Always confirm your engine type before ordering.
Technical Specifications
Fits 1959-1960 International B122 models, typically equipped with the International Harvester BD/SD series 6-cylinder engine. Cap is secured by clips and features female/socket style towers.
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.