A Comprehensive Guide to the Engine Timing Set for the 1978-1980 Dodge RD200
Learn how to spot a worn timing chain on your classic Dodge truck and choose the right replacement parts.
- A rattling noise from the front of the engine is the most common sign of a worn timing chain on these trucks.
- You must confirm your engine size (Slant 6, 318, 360, etc.) before ordering, as parts are not interchangeable.
- For a stock truck, a standard replacement set from Cloyes or Melling is a reliable choice.
- For a performance or heavy-duty application, upgrading to a double roller set from a brand like Edelbrock is recommended for durability.
Is Your Truck's Timing Chain Failing?
On a classic truck like the 1978-1980 Dodge RD200, the timing chain is a normal wear item. After decades of service, the chain stretches and develops slack. This slack can cause significant running issues. Because these trucks don't have a 'Check Engine' light for timing problems, you have to listen and feel for the symptoms.
The most common sign of a worn timing chain is a rattling or slapping noise coming from the front of the engine. This is the sound of the loose chain hitting the inside of the metal timing cover. You may also notice a rough idle, engine misfires, a lack of power, or that the engine is hard to start. These issues happen because the stretched chain has thrown off the engine's valve timing.
Pro Tip: The Distributor Test
A classic way to check for timing chain slack on these older Dodge engines is to remove the distributor cap. Use a wrench on the crankshaft bolt to slowly rock the engine back and forth by hand. Watch the distributor rotor and see how many degrees the crankshaft turns before the rotor begins to move. If you see more than 8-10 degrees of play on the timing marks of the harmonic balancer, the chain is likely worn out and needs replacement.
Choosing the Right Aftermarket Timing Set
For a vehicle of this age, new original equipment (OEM) parts are no longer available. The aftermarket is your only source for a new timing set. Fortunately, several reputable brands offer quality replacements. The most important step is to confirm your engine size before ordering, as timing sets for a Slant 6, 318 V8, and 360 V8 are all different.
Brand Quality Tiers
- Performance Tier (Edelbrock, Melling Select Performance): Brands like Edelbrock offer "double roller" or "true roller" timing sets. These are stronger than the original factory-style chains and are designed to resist stretching, making them a great upgrade for longevity and performance. They are ideal for engines that are worked hard or have performance modifications.
- Standard Replacement Tier (Cloyes, Melling): Cloyes and Melling are well-respected names that provide reliable, stock-style replacement timing sets. For a daily driver or a stock restoration, a standard set from either of these brands is an excellent choice that meets or exceeds original factory quality. While forum users occasionally report issues, these brands remain the most trusted for standard replacements.
Check for Clearance with Double Roller Chains
Upgrading to a thicker double roller chain may require you to check for clearance. Ensure the new, wider chain does not rub against the engine block or the inside of the timing cover.
Estimated Costs for Timing Set Replacement
| Part Type | Estimated Cost |
|---|---|
| Aftermarket Standard Timing Set (e.g., Cloyes, Melling) | $31 - $80 |
| Aftermarket Performance Timing Set (e.g., Edelbrock) | $80 - $168 |
| Shop Labor | $400 - $750 |
Frequently Asked Questions (FAQ)
Do I need a timing chain with a nylon gear?
Some original timing sets used a camshaft gear with nylon-coated teeth to reduce noise. However, these nylon teeth are prone to chipping and failing over time. All modern aftermarket replacements use all-metal gears (cast iron or steel) for much greater durability. You should always replace an old nylon gear set with a full metal one.
Is a double roller chain better than a standard chain?
For most stock applications, a quality standard "silent" type chain from Melling or Cloyes is perfectly adequate. A double roller chain is stronger and stretches less, making it a worthwhile upgrade for performance engines or heavy-duty use. Keep in mind they can sometimes be slightly noisier than a standard chain.
Do I need a new timing cover?
Usually, you can reuse your original timing cover. However, inspect it carefully after removal. If a very loose chain has been slapping against it, the inside may be grooved or damaged. Also, check the area where the crankshaft seal sits for deep grooves or corrosion. If there is significant damage, it's best to replace the cover.
Should I replace the water pump at the same time?
Yes. Replacing the timing set requires removing the water pump. Since you already have it off and have drained the cooling system, it is highly recommended to install a new water pump at the same time. This saves you from having to do the same labor all over again if the old water pump fails soon after.
Technical Specifications
Fitment is specific to the engine installed in your truck. Common engines include the 225 ci Slant 6, 318 ci V8, and 360 ci V8. The timing set includes a camshaft sprocket, a crankshaft sprocket, and a timing chain.
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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.