Description

When your old International Harvester starts acting temperamental with rough idling or misfiring, the distributor cap on your H4 magneto could be the culprit. Moisture, dirt, and years of heat cycles crack these caps and corrode the terminals, causing spark to jump where it shouldn’t. This replacement cap gets your ignition system firing properly again so you can get back to work without worrying about your tractor cutting out in the middle of a job.

What You’re Getting

Direct replacement cap designed specifically for H4 magneto systems on International Harvester tractors
Heavy-duty construction that stands up to engine heat and weather exposure
Proper terminal spacing ensures strong, consistent spark delivery to each cylinder
Quality materials resist cracking and moisture infiltration that causes ignition problems

Built for Classic Farm Work

This cap fits the H4 magneto ignition systems found on many classic International Harvester and Farmall tractors from the era when magnetos were the standard. Whether you’re running an old Farmall for hay work, using it around the farmyard for chores, or keeping a classic machine running for shows and parades, reliable ignition is essential.

Made to Last

The original caps on these tractors have been dealing with decades of temperature swings, moisture, and vibration. This replacement cap is built with quality materials that resist the cracking and deterioration that kills ignition performance. The terminals stay clean and make solid contact for dependable spark.

Installation Notes

This cap threads right onto your H4 magneto housing—just remove the old cap and install the new one. Clean the magneto housing threads before installation, and make sure the spark plug wires are in good shape while you’ve got everything apart. Check that the rotor isn’t cracked or worn while you’re at it.