Chrysler Imperial Ignition Contact Set Guide (1946-1951)
Keep your classic 1946-1951 Chrysler Imperial running smoothly by understanding its ignition contact set.
- The ignition contact set (points) is a routine maintenance part on your 1946-1951 Imperial that requires periodic replacement.
- Symptoms of failure include rough running, stalling, and a no-start condition.
- Aftermarket is the only viable option; Standard Ignition is a well-regarded brand for these components.
- Replacing the points is a feasible DIY job for a mechanically inclined owner, with the key tool being a feeler gauge.
Understanding Your Imperial's Ignition System
For a classic 1946-1951 Chrysler Imperial, the ignition system is a fully mechanical and electrical setup. At its heart are the ignition contact points. These are a simple on-and-off switch that controls when the ignition coil releases its energy to create a spark. This system was the standard for decades before the arrival of modern electronic ignition. Because the points are a mechanical part with a rubbing block that wears down, they require regular maintenance and eventual replacement to keep the engine running properly.
Symptoms of a Failing Ignition Contact Set
When the ignition points wear out, get dirty, or become misaligned, they can cause several noticeable problems with your engine's performance. Ignoring these signs can lead to a no-start situation.
- Engine Won't Start: The most severe symptom is a complete failure to start. Worn or burned points can't properly trigger the coil, resulting in a weak spark or no spark at all.
- Rough Running and Misfires: If the points are pitted or improperly gapped, the engine may run rough, shake at idle, and misfire. This happens because the spark timing becomes inconsistent, causing some cylinders not to fire correctly.
- Engine Stalling: A car that stalls, especially at idle or when you come to a stop, can be a sign of bad points. The weak, inconsistent spark can't keep the engine running at low RPMs.
- Reduced Power: If your Imperial feels sluggish during acceleration, it could be due to worn points delivering a weak or intermittent spark, leading to inefficient combustion.
Driving with Bad Points
Driving with failing ignition points is not recommended. The symptoms, such as rough running and stalling, will only get worse. Eventually, the vehicle may not start at all, potentially leaving you stranded.
Choosing the Right Aftermarket Part
For a vehicle from this era, finding new original equipment (OEM) Mopar parts is nearly impossible. Aftermarket parts are the standard for keeping these classics on the road. Even if you find a New Old Stock (NOS) part, be cautious, as components like condensers can degrade over time simply from sitting on a shelf.
A properly installed and adjusted set of quality aftermarket points can be just as effective as a modern electronic ignition system for a stock vehicle.
Brand Quality: Standard Ignition
Standard Ignition (including their Blue Streak line) has a long-standing reputation as a quality manufacturer of ignition components for American vehicles. Forum discussions among classic car and tractor owners often recommend Standard Ignition as a reliable choice for points and condensers. While the quality of all modern points may not match the original tungsten parts from the 1950s, Standard is considered one of the best available today.
Replacement Cost
The cost to replace the ignition contact set is relatively low, especially for DIYers. The main costs are the part itself and, if you choose, professional labor.
| Part Type | Price Range |
|---|---|
| New Aftermarket (Standard Ignition) | $28.25 |
| New OEM (Mopar) | Not Available |
| Shop Labor | $75 - $150 |
Frequently Asked Questions (FAQ)
Do I need to replace the condenser at the same time as the points?
Yes, it is highly recommended. The condenser is critical for protecting the points from arcing and ensuring a strong spark. It is almost always included in a new ignition contact set and should be replaced with the points.
What tools do I need to replace the ignition points?
You will need basic hand tools like screwdrivers and a wrench, but the most important tool is a feeler gauge. A feeler gauge is used to set the correct gap between the points, which is critical for proper engine timing and performance. A magnetic screwdriver can also be very helpful for handling the small screws inside the distributor.
Are there any recalls or technical bulletins for my Imperial's ignition?
No recalls or Technical Service Bulletins (TSBs) were found for the ignition contact set on the 1946-1951 Chrysler Imperial. Public digital records from agencies like NHTSA generally do not cover specific components on vehicles of this age.
Can I upgrade to an electronic ignition?
Yes, electronic ignition conversion kits are available for many classic cars. These kits replace the points and condenser with a solid-state module, reducing the need for regular maintenance. However, a well-maintained points system works reliably and keeps the vehicle original.
Technical Specifications
Mechanical ignition switch located inside the distributor. Requires periodic gapping and replacement.
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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.