Engine Timing Set Guide for 1973-1982 Buick Century
Keep your classic Century's engine running strong by understanding its timing set needs.
- You must identify your specific engine (e.g., 231 V6, 350 V8) before ordering, as parts are not interchangeable.
- Symptoms of failure include engine rattle, poor performance, and metal/plastic shavings in the oil.
- Always replace the chain and sprockets together as a set.
- Upgrading from a standard link chain to a roller chain from a brand like Melling or Edelbrock is a worthwhile durability improvement.
Understanding Your Century's Engine is Key
Before buying a timing set, you must know which engine is in your 1973-1982 Buick Century. This model range used several different engines, and the timing set is specific to each one. Common engines include the Buick 231 V6 (also known as the 3.8L), the Buick 350 V8, and even the large 455 V8 in early years. Always verify your engine type to ensure you purchase the correct parts.
Symptoms of a Failing Timing Set
The original timing chains in these engines can stretch over time. A key weak point, especially on the V6 engines, was the original camshaft gear which often had nylon-coated teeth that wear down and break off. When the timing set wears, it can cause several noticeable problems.
- Engine Rattle: A loose or stretched timing chain can slap against the inside of the timing cover, creating a distinct rattling sound, especially when the engine is first started or at idle.
- Poor Performance and Misfires: As the chain stretches, the camshaft and crankshaft timing becomes inaccurate. This can lead to rough running, engine misfires, a loss of power, and reduced fuel economy.
- Metal Shavings in Oil: When the chain or gears wear excessively, tiny metal or plastic particles can end up in the engine oil. You might notice this during an oil change.
- Engine Won't Start: In a worst-case scenario, a very stretched chain can jump a tooth on a sprocket, or the chain can break entirely. If this happens, the engine will not start.
Is a Buick Century Engine an Interference Engine?
The common pushrod V6 and V8 engines used in this era of Buick Century are generally non-interference designs. This is good news. It means that if the timing chain breaks, the pistons will likely not hit and destroy the valves. However, a broken chain can still cause damage as it comes loose inside the engine, and the car will leave you stranded. You should not drive a vehicle with symptoms of a bad timing chain.
Choosing the Right Aftermarket Timing Set
For a vehicle of this age, new OEM (Original Equipment Manufacturer) parts are generally not available. The aftermarket is your primary source, offering a range of options from standard replacements to performance upgrades.
Brand Tiers & Quality
- Standard Replacement (Good): Brands like Sealed Power and INA offer reliable, OE-quality replacement sets. These are perfect for a daily driver or a standard restoration and are very affordable. They often replicate the original designs, though with more durable all-metal gears instead of the original nylon-toothed cam gears.
- Heavy-Duty / OE-Plus (Better): Cloyes and Melling are well-respected names that offer both standard and heavy-duty timing sets. Their standard sets are excellent, but for a bit more, you can often get a set with a more durable roller chain, which is an upgrade over the original "link-belt" style chain.
- Performance (Best): Brands like Edelbrock and Melling Select Performance offer high-performance timing sets. These often feature double-roller chains and billet steel gears. They provide maximum durability and timing accuracy, making them ideal for high-performance rebuilds or for owners who want the absolute best parts available. Some even offer multiple keyways on the crankshaft sprocket to allow for advancing or retarding cam timing.
Pro Tip: When replacing the timing set, it's a great time to also inspect and likely replace the water pump and the timing cover seal to prevent future leaks. On many Buick engines, the timing cover is a critical part of the oiling system, so careful installation is key.
How Much Does a New Timing Set Cost?
The cost for the parts themselves is quite reasonable. The main expense in a timing set replacement is the labor required to access it.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Timing Set | $25 - $96 |
| Shop Labor | $400 - $800 |
Cost estimates are for reference only and can vary based on your location, engine type, and the specific shop.
Frequently Asked Questions
Do I have to replace the sprockets with the chain?
Yes. Always replace the timing chain and sprockets as a matched set. A new chain on old, worn sprockets will wear out very quickly and will not perform correctly.
What is the difference between a standard chain and a roller chain?
A standard or "link-belt" chain looks similar to a bicycle chain. A roller chain has small rollers on each link, which reduces friction as it contacts the sprocket teeth. True-roller chains are more durable and are considered a performance upgrade.
Were there any recalls on the timing set for the 1973-1982 Century?
No specific recalls for the engine timing set were found for this generation of Buick Century. Most issues are related to normal wear and tear over many decades, particularly the original nylon cam gears.
My timing set has a plastic/nylon gear. Is that bad?
The original camshaft sprockets on many of these engines, especially the V6, used nylon-coated teeth to reduce noise. Over time, the nylon becomes brittle, cracks, and breaks off, which can lead to a loose chain or clog the oil pump pickup screen. All quality aftermarket replacements use all-metal sprockets for much greater durability.
Technical Specifications
Varies by engine. Common engines include the Buick 231ci V6, Buick 350ci V8, and Buick 455ci V8. Early V6 models may be 'odd-fire' while later ones are 'even-fire', which can affect some components. Aftermarket sets are available in standard link-belt, single roller, and double roller chain configurations.
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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.