A Guide to the Ignition Coil for the 1952-1953 Allstate A-240
Keep your classic Allstate running strong by understanding how to choose the right ignition coil.
- The Allstate A-240 is a rebadged Kaiser Henry J; parts are often listed under "Henry J".
- You must verify if your car has the original 6-volt system or a 12-volt conversion before buying a coil.
- Symptoms like misfiring and stalling can also point to bad points or a condenser; inspect the whole ignition system.
- Standard Ignition is a highly-regarded aftermarket brand for this application; aftermarket is the only option for new parts.
Signs of a Failing Ignition Coil
The ignition coil on a vintage vehicle like the Allstate A-240 is a common wear item. When it starts to fail, the symptoms can range from minor annoyances to a car that won't start at all. Because the A-240 shares its engine and electrical parts with the more common Kaiser Henry J, we know these symptoms well. Watch for these signs:
- Hard Starting or No Start: A weak coil may not produce enough voltage to start the engine, especially when cold.
- Engine Misfires: The car may sputter, shake, or jerk while idling or accelerating because a cylinder isn't firing correctly.
- Stalling: The engine might suddenly shut off when you come to a stop and then be difficult to restart.
- Loss of Power: Your car may feel sluggish and struggle to accelerate or climb hills.
- Backfiring: Loud pops from the exhaust can occur when unburned fuel ignites in the exhaust system due to a weak or inconsistent spark.
- Visible Damage: On these older oil-filled canister coils, failure can be dramatic. Look for signs of oil leaking from the coil tower or the case swelling or cracking. In severe cases, the terminal can even blow out.
Check the Whole System
Many symptoms of a bad coil can also be caused by failing points, a bad condenser, or old spark plug wires. These parts are all part of the same system. It is wise to inspect the entire ignition system when you experience these issues.
Choosing the Right Aftermarket Coil
For a 1952-1953 vehicle, finding new original equipment (OEM) parts is nearly impossible. The aftermarket is the primary source for new ignition coils, and modern manufacturing often means these parts meet or exceed the quality of the originals. The most critical factor is ensuring you buy the correct coil for your car's electrical system.
Pro Tip: The Allstate A-240 originally came with a 6-volt electrical system. Many classic cars have been converted to 12-volts over the years. You MUST confirm if your car is still 6-volt or has been updated to 12-volt before ordering a coil. Installing the wrong voltage coil will cause it to fail quickly.
Available Brands: Standard vs. Spectra
When shopping for your A-240, you will likely see two main brands available: Standard Ignition and Spectra.
- Standard Ignition (SMP): Often considered a top-tier aftermarket brand with a long history of making quality ignition components. Their "Blue Streak" line is marketed as a premium quality product. For a classic vehicle where reliability is key, Standard is a trusted choice in the restoration community.
- Spectra (Spectra Premium): A widely available brand that produces a vast range of aftermarket parts. While they offer a cost-effective option, general brand reviews can be mixed. For a critical component like the ignition coil, many classic car owners prefer to use a brand with a stronger reputation in ignition systems.
Typical Replacement Costs
Replacing the ignition coil on an A-240 is a straightforward and affordable job. The part itself is not expensive, and labor is minimal.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil | $28 - $39 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost | $78 - $139 |
Frequently Asked Questions
Can I replace the ignition coil myself?
Yes, this is a very simple job for a DIY mechanic. It typically involves disconnecting the battery, removing one or two small wires from the coil's terminals, unplugging the main high-tension wire that goes to the distributor, and unbolting the coil from its mounting bracket. The entire process usually takes less than 30 minutes.
Is an aftermarket coil good enough for my classic Allstate?
Absolutely. Since new OEM parts are not available, a quality aftermarket coil is the best and only option. Reputable brands like Standard Ignition have been making ignition parts for decades and their products are reliable replacements that often exceed original 1950s specifications.
What is the difference between a canister coil and a coil-on-plug?
Your 1952-1953 Allstate A-240 uses a single, oil-filled canister coil for the entire engine. This one coil sends spark to the distributor, which then sends it to the correct spark plug. Modern cars use a "coil-on-plug" (COP) system where each spark plug has its own individual coil right on top of it. You only need to worry about the single canister style for your vehicle.
Do I need a ballast resistor?
If your car still has its original 6-volt system and you are using a 6-volt coil, you typically do not need an external ballast resistor. However, if your car has been converted to a 12-volt system, you will likely need an external ballast resistor to use with a 6-volt coil to prevent it from overheating. Some 12-volt replacement coils have an internal resistor and do not require an external one. Always check the specifications of the coil you are purchasing.
Technical Specifications
System Voltage: 6-Volt (Original), Style: Canister, Oil-Filled, Primary Resistance: ~1.0-1.5 Ohms (for 6V system without external resistor)
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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.