Although it may seem like a simple rubber belt, the timing belt is a key component in any internal combustion engine. It’s primarily responsible for maintaining the synchronization between the camshaft and the crankshaft, which ensures the valves open and close at precisely the right moments. You can think of it a lot like a conductor in a symphony who ensures that every note is played in perfect harmony. In some engines the timing belt also drives the water pump which helps regulate the engine’s temperature.
Whether you’re a car enthusiast or simply want to ensure your vehicle’s longevity, understanding the significance of your timing belt—and being proactive with its maintenance—is a must. Here’s a closer look at how it works, why inspections and replacements are important, and how to spot timing belt issues.
How Does the Timing Belt Work?
In a four-stroke engine, there are four phases: the intake phase, compression phase, combustion phase, and exhaust phase:
- Intake phase: The intake valves are open and the exhaust valves are closed; air and fuel are pulled into the cylinders.
- Compression phase: The air and fuel is mixed and compressed.
- Combustion phase: The compressed air-fuel mixture is ignited by the spark plug.
- Exhaust phase: The intake valves close and the exhaust valves open to allow the burned gases to exit the chamber.
The timing belt must control the opening and closing of the valves and the timing of the valves in relationship to the pistons throughout each phase.
If the timing belt is damaged or jumps a cog, this synchronization can be thrown off. As a result, the engine’s valves may open and close at the wrong times and disrupt the combustion process. It can also cause engine misfires, stalling, and a significant reduction in engine power. Even worse, there’s always the risk of catastrophic engine damage should the belt fail entirely for any reason. Therefore, it’s crucial to address timing belt issues promptly and follow your manufacturer’s recommended replacement intervals.
Replacing Your Timing Belt
In the past, timing belts typically needed replacement every 60,000 miles. However, design advancements have extended their lifespan to up to 100,000 miles or more. Regardless of this, it’s essential to remember that timing belts are made of rubber that’s constantly exposed to very high temperatures. Even cars that are driven infrequently can experience rubber degradation over time, so it’s recommended to have your timing belt inspected periodically.
Although replacing a timing belt isn’t a cheap repair, it’s significantly less expensive than repairing the damage caused by a slipped or broken belt. Damage to the engine’s head, pistons, and valves can be extensive and it’s not uncommon to need a complete engine replacement—which can cost thousands of dollars.
When you have the timing belt replaced, it’s generally a good idea to replace nearby components (like the water pump, tensioners, and drive belts) as well because it will save you time and money on labor costs.
Some common signs of a worn or damaged timing belt include:
- Ticking noises coming from your engine
- The engine won’t turn start
- Oil leaks near the timing belt cover
- Significant loss of engine performance
- Engine will not run at idle speed
Keep in mind that sometimes there are no obvious signs of timing belt trouble, which is why regular inspections—and proactive replacements—are so important.
Protect Your Engine at Express Auto/RV Care Center
If you’re due for a timing belt replacement or would like to have your timing belt inspected, turn to the pros at Express Auto/RV Care Center! Our team of ASE-certified technicians is dedicated to ensuring your vehicle’s reliability and performance with comprehensive maintenance and repairs. We also provide a nationwide 3-year/36,000-mile warranty, so no matter where you travel, you can have complete peace of mind.
We take pride in caring for your vehicle, and we invite you to experience the difference for yourself. Visit our full-service auto repair shop and discover why we’ve earned the title of the best auto repair shop in Yuma for 20 years running!
Want more great advice on saving money on car repairs? Order Russell McCloud’s book Knowledge is Power by clicking here.