Dodge D350 Engine Timing Set: A Guide for Gas V8 and Cummins Diesel
Understanding the critical differences in timing components for your 1981-1993 Dodge D350 is the first step to a reliable repair.
- First, identify your engine: a gas V8 uses a timing chain, while the 5.9L Cummins diesel uses timing gears.
- For gas V8s, a rattling noise from the engine front means the chain is likely worn and needs immediate attention.
- For Cummins diesels, the 'Killer Dowel Pin' (KDP) is a critical issue; install a retainer kit if the timing cover is ever removed.
- Upgrading to a double roller timing chain on a gas V8 is a worthwhile investment for improved durability.
Gas or Diesel? Your Engine Determines Your Timing Set
Before you shop, you must know which engine is in your D350. The timing parts are completely different and not interchangeable. The 5.2L (318ci) and 5.9L (360ci) are gas V8 engines that use a timing chain. The 5.9L 12-valve Cummins, available from 1989-1993, is a straight-six diesel engine that uses timing gears.
For Gas V8 Engines (5.2L & 5.9L)
If you have a gas engine, you are dealing with a timing chain and two sprockets. The original chains can stretch over time, and sprockets with nylon-coated teeth can wear down or break apart. This is a common wear item on older V8s.
Symptoms of a Failing Timing Chain
- Rattling Noise: A distinct rattling or slapping sound from the front of the engine, especially at idle or on cold starts, is a classic sign of a loose chain.
- Engine Misfires: A stretched chain can alter ignition and valve timing, causing the engine to run rough or misfire.
- Loss of Power: Incorrect cam timing from a worn set will reduce engine performance and fuel economy.
- Metal Shavings in Oil: In severe cases, you might find pieces of broken sprocket teeth (especially plastic/nylon) in the oil pan during an oil change.
Choosing an Aftermarket Timing Set (Gas V8)
For a stock daily driver, a standard replacement set from a reputable brand is a good choice. For trucks that work hard or for owners looking for a long-term durability upgrade, a double roller chain set is recommended.
- Standard Replacement (Good): Brands like Melling and Cloyes offer quality, all-metal replacement sets that are equivalent to or better than the original parts. They are a reliable choice for a standard rebuild.
- Heavy-Duty Upgrade (Better): A 'double roller' timing set from brands like Edelbrock, Melling Select Performance, or Cloyes provides a stronger chain that is less likely to stretch. This is a smart upgrade for heavy towing or performance applications.
Pro Tip: Upgrade to All-Metal
If your original camshaft sprocket has nylon-coated teeth, always replace it with a full-steel or iron sprocket set. The nylon can become brittle, break off, and clog the oil pump pickup screen, leading to oil starvation.
For 5.9L Cummins Diesel Engines (1989-1993)
The Cummins diesel uses a robust set of timing gears that are known to last the life of the engine. Gear failure is extremely rare. However, there is a very serious and well-known issue associated with the timing gear housing: the Killer Dowel Pin (KDP).
CRITICAL ISSUE: The Killer Dowel Pin (KDP)
From the factory, a small steel dowel pin was used to align the timing gear housing to the engine block during assembly. Over time, vibrations can cause this pin to walk out of its bore and fall directly into the rotating timing gears. This can cause a cracked timing case, broken gears, or even catastrophic damage if the camshaft stops suddenly and pistons collide with the valves. This issue affects 1989-1998 12-valve Cummins engines.
The Fix: If you are replacing the timing cover gasket or have the front of the engine apart for any reason, it is essential to address the KDP. Inexpensive kits are available that include a tab or retainer that bolts in place over the pin, preventing it from ever backing out. This is considered a mandatory preventative fix for any 1st Gen Cummins owner.
Cost of a New Aftermarket Timing Set
| Part Category | Estimated Price Range |
|---|---|
| New Aftermarket Timing Set (Gas V8) | $31 - $168 |
| New Aftermarket Timing Gears (Diesel) | $50 - $200+ (Gears rarely need replacement; cost is usually for KDP kit and gaskets) |
| Shop Labor | $350 - $600 |
Note: Prices are estimates and can vary based on location, brand, and the specific parts included in a kit.
Frequently Asked Questions (FAQ)
Do I need to replace my timing gears on my Cummins if they look fine?
Almost certainly not. The Cummins timing gears are very durable. The main reason to open the timing cover is to fix a leak or to proactively install a Killer Dowel Pin (KDP) retainer tab. While the cover is off, inspect the gears for any obvious damage, but replacement is not a typical maintenance item.
What's the difference between a single and double roller timing chain?
A double roller chain is physically wider and has two sets of rollers, making it stronger and more resistant to stretching than a standard single roller or link-belt style chain. It's a popular performance and durability upgrade for gas V8 engines.
Are there any recalls for the timing set on my D350?
No, searches of the NHTSA database did not show any official safety recalls for the engine timing set on the 1981-1993 Dodge D350.
Do I need special tools to replace my timing set?
Yes, you will likely need a harmonic balancer puller to remove the crankshaft pulley. The rest of the job can be done with standard mechanic's hand tools. For Cummins engines, a KDP retainer kit will come with its own specific hardware.
Technical Specifications
System Type: Timing Chain & Sprockets (5.2L/5.9L Gas V8) or Timing Gear Set (5.9L Cummins Diesel). Chain Upgrade Option: Double Roller (Gas V8).
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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.
- Dodge D350:
- 🛍️ Shop This Part
- Gas or Diesel? Your Engine Determines Your Timing Set
- For Gas V8 Engines (5.2L & 5.9L)
- Symptoms of a Failing Timing Chain
- Choosing an Aftermarket Timing Set (Gas V8)
- Pro Tip: Upgrade to All-Metal
- For 5.9L Cummins Diesel Engines (1989-1993)
- CRITICAL ISSUE: The Killer Dowel Pin (KDP)
- Cost of a New Aftermarket Timing Set
- Frequently Asked Questions (FAQ)
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