Dodge D150 (1977-1993) Engine Timing Set Replacement Guide
Everything you need to know about replacing the timing set on your classic Dodge D150 truck.
- The original nylon cam gear on V8 models is a known failure point and should be replaced with an all-metal aftermarket set.
- A rattling noise from the front of the engine is the most common sign of a worn timing chain.
- Upgrading to a double roller timing set from a brand like Melling, Cloyes, or Edelbrock is a smart choice for durability.
- It is highly recommended to replace the water pump and timing cover gaskets at the same time as the timing set.
The Original Problem: Nylon Cam Gears
If you own a 1977-1993 Dodge D150 with a V8 engine, it's very likely that the original timing set from the factory has a major weak point. The camshaft gear was made with nylon-coated plastic teeth. Over many years and heat cycles, this nylon becomes brittle, cracks, and breaks off. When the teeth break, the timing chain becomes very loose, causing a number of problems. The broken plastic pieces fall into the oil pan, where they can clog the oil pump pickup screen and starve the engine of oil.
Symptoms of a Failing Timing Set
A worn timing set gives clear warning signs. Ignoring them can lead to your truck not starting at all.
- Engine Rattle: The most common symptom is a rattling or slapping noise coming from the front of the engine, 🎬 Watch: Hear the rattle of a loose Dodge 318 chain especially noticeable at idle or on startup. This is the sound of the loose timing chain hitting the inside of the timing cover.
- Poor Performance: Your truck might be hard to start, idle roughly, misfire, or feel sluggish and down on power. This happens because the loose chain allows the camshaft and crankshaft to go out of sync.
- Wandering Ignition Timing: If you check the ignition timing with a timing light, the mark on the harmonic balancer will appear to jump around erratically instead of holding steady. This is a direct result of the slack in the chain.
Is the Dodge LA V8 an Interference Engine?
No, the small block Mopar LA engines (like the 318 and 360) are generally considered non-interference engines. This means if the timing chain breaks or jumps a tooth, the pistons will not hit and destroy the valves. While the engine will stop running, you likely won't face catastrophic internal damage.
Choosing the Right Aftermarket Timing Set
When you replace your timing set, you will be upgrading to a full-metal design that won't fail like the original. Aftermarket sets come in a few different quality tiers.
Standard Replacement Sets
These kits are a direct replacement for the original parts but use an all-metal camshaft gear instead of the failure-prone nylon one. They typically use a standard "silent" or link-belt style chain, similar to the original. Brands like INA, and the standard lines from Cloyes and Melling, fall into this category. They are a reliable and affordable choice for a daily-driven or stock truck.
Heavy-Duty & Performance Sets
For improved durability and timing accuracy, especially on a modified or hard-working engine, a double roller timing set is a popular upgrade. These sets feature two rows of rollers on the chain and matching sprockets, making them much stronger and less prone to stretching. They can sometimes produce a slight whirring noise compared to a silent chain. Brands in this category include:
- Melling Select Performance: A well-regarded option for high-quality, durable components.
- Cloyes (Race Billet/True Roller): Their higher-end double roller sets are trusted for performance applications.
- Edelbrock: Known for performance, Edelbrock offers high-quality double roller sets that are very durable.
Pro Tip: Some users in online forums have reported quality control issues with budget-level timing sets, noting excessive slack even when new. It's wise to inspect any new timing set before installation. A quality set should feel tight with very little play in the chain.
| Brand Tier | Price Range | Best For |
|---|---|---|
| Standard Replacement (INA, Cloyes, Melling) | $31.57 - $75.00 | Stock daily drivers |
| Heavy-Duty/Performance (Melling Select, Edelbrock, Cloyes Double Roller) | $90.00 - $185.85 | Towing, performance builds, maximum durability |
Frequently Asked Questions
Do I need to replace my water pump at the same time?
Yes, it is highly recommended. The timing set replacement requires removing the water pump to access the timing cover. Since you've already done most of the labor, replacing the water pump at the same time is cheap insurance against having to do the job all over again if it fails soon after.
What is a double roller chain and do I need one?
A double roller chain is a heavy-duty style of timing chain with two rows of rollers, making it stronger and more resistant to stretching than the factory single-row "silent" chain. For a stock truck, it's a great durability upgrade but not strictly necessary. 🎬 Watch: How to install a timing chain tensioner upgrade For any engine with performance modifications or one that does heavy towing, a double roller is the recommended choice.
How difficult is it to replace 🎬 See this walkthrough of a basic timing chain installation the timing set myself?
This is a moderately difficult job for a home mechanic. It requires draining fluids, removing the radiator, fan, belts, pulleys, harmonic balancer, and water pump. The most challenging part is often reinstalling the timing cover and getting the gaskets for the oil pan and cover to seal properly without leaks.
Will a new timing set fix my wandering ignition timing?
Yes, in most cases. Erratic timing is a classic symptom of a stretched or loose timing chain. Installing a new, tight timing set will restore the stable connection between the crank and cam, allowing your timing to hold steady.
Helpful Videos
Technical Specifications
OEM V8 Camshaft Gear: Nylon-Coated Teeth. Aftermarket Upgrade: All-metal construction (cast iron or billet steel). Chain Types: Standard Link-Belt ('Silent Chain') or Double Roller.
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.