Engine Timing Set Replacement Guide for 1979-1981 Dodge St. Regis
Learn how to choose the right timing set and avoid the common failures of original Mopar engines.
- For V8 engines, replacing the original nylon-toothed cam gear with a modern all-metal aftermarket set is the most critical reliability upgrade.
- You must confirm if you have a Slant 6 or a V8 (318/360) engine before ordering, as the parts are not interchangeable.
- While performing the replacement, it is highly recommended to also replace the front crankshaft seal and the water pump.
- Symptoms of a bad timing set include engine rattle, poor performance, wandering ignition timing, and hard starting.
The Original Problem: Nylon Timing Gears on V8 Engines
If your 1979-1981 St. Regis has a 318 or 360 V8 with its original timing set, it likely has a camshaft gear with nylon-coated teeth. Manufacturers used this design to make the engine run quieter. However, after decades of heat and exposure to engine oil, the nylon becomes brittle, cracks, and breaks off. These small plastic pieces can fall into the oil pan and clog the oil pump pickup screen, which can lead to major engine failure from oil starvation. This is the single most common major failure point for these engines. Upgrading to an aftermarket set with all-metal gears is essential for reliability.
Symptoms of a Failing Timing Set
A worn or failing timing set gives several warning signs. You might notice:
- A rattling noise from the front of the engine.
- Difficulty starting the engine.
- Rough idling or stalling.
- A noticeable loss of power and occasional backfiring.
- When using a timing light, the ignition timing mark may appear to jump around or wander.
If the chain jumps a tooth, the engine may run very poorly or not at all. If it breaks completely, the engine will stop immediately and may suffer severe internal damage.
Confirm Your Engine Before Ordering
The 1979-1981 Dodge St. Regis came with three engine options: the 225 Slant 6, the 318 V8, and the 360 V8. The timing set for the Slant 6 is completely different from the one used on the V8s. The 318 and 360 V8 engines typically use the same timing set. Always verify your engine before purchasing a part.
Choosing the Right Aftermarket Timing Set
For a classic vehicle like the St. Regis, aftermarket parts are often better than the original design. All available aftermarket timing sets for the V8 engines will be an upgrade over the factory nylon gear.
- Standard Replacement (Good): Brands like Cloyes and Melling offer excellent standard replacement timing sets. These kits feature an all-metal (cast iron or steel) camshaft gear, which is far more durable than the original nylon-toothed gear. For a stock daily driver, these kits are a perfect, reliable choice.
- Heavy-Duty & Performance (Better): For added strength, consider a set with a 'true roller' or 'double roller' chain. Brands like Melling Select Performance and Edelbrock offer these. A double roller chain provides more stability and strength, which is beneficial for engines that work hard or have performance upgrades.
- INA is also a quality brand, though more commonly associated with European vehicles. Their inclusion in the market provides another reliable option.
What to Replace With Your Timing Set
Since you'll have the front of the engine disassembled, it's smart to replace a few other items. Always install a new front crankshaft seal (which comes with many kits). It's also the perfect time to replace the water pump, as it has to be removed for the job anyway.
| Part Type | Estimated Price Range |
|---|---|
| New Aftermarket Timing Set | $31.57 - $167.28 |
| New OEM | Not Available |
| Used OEM | Not Recommended (due to nylon gear failure) |
Frequently Asked Questions (FAQ)
Is a double roller chain worth it for my stock engine?
For a completely stock, gently-driven St. Regis, a standard all-metal replacement set from a brand like Melling or Cloyes is perfectly adequate and a huge upgrade over the original. However, a double roller set offers extra peace of mind and durability for a small additional cost, making it a popular choice even for stock rebuilds.
Will an all-metal timing set be a lot noisier than the original?
The original nylon gears were used specifically to reduce noise (NVH - Noise, Vibration, and Harshness). An all-metal set might produce a slightly more audible whirring sound, but most owners do not find it intrusive. The massive increase in reliability is well worth any minor change in engine noise.
Do I need special tools for this job?
Yes. The most important special tool is a harmonic balancer puller. You will not be able to remove the balancer, which is necessary to access the timing cover, without one. You may also need a torque wrench and basic hand tools. Do not try to pry or hammer the balancer off.
What happens if I install the timing set incorrectly?
Incorrect installation can cause poor running or serious engine damage. The key is to align the timing marks on the crankshaft and camshaft gears exactly as specified in the service manual. If the marks are not aligned, the valve timing will be off, and the engine may not start or could even have pistons strike the valves.
Technical Specifications
Kits vary based on engine: Chrysler 225 CID (3.7L) Slant 6, or Chrysler 318/360 CID (5.2L/5.9L) LA-series Small Block V8. Aftermarket V8 kits feature all-metal sprockets, replacing the failure-prone OEM nylon gear. Upgrade options include double-roller chains for increased durability.
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.