VIDEO: When Should A Sprocket Be Replaced

VIDEO: When Should A Sprocket Be Replaced?

Ignoring the fatigue life of the sprockets can limit the life of the whole system. This video is sponsored by Cloyes.

During a timing chain replacement, we’ve all been there.

You open up the timing chain kit and notice new sprockets in the kit. You may think that you could save a lot of time and money by not replacing the sprockets, but you’re opening yourself up to potential failure or reducing the longevity of the repair.

If you think that you can get away without replacing the sprockets, remember chains and sprockets are both engineered together mechanically and metallurgically. When a timing chain stretches and fatigues, the relationship between the pins and links changes. These small dimensional fitment changes result in a summation of stretch and impact how the chains engage with the sprockets. This can cause adverse tooth wear, which will not line up to replacement chain lacing or roller patterns.

By the time a customer comes to your shop with a P0016 or P0017 code for camshaft to crankshaft correlation, chances are the wear is already occurred to sprockets due to the stressed timing chain.

In addition, misfires can impact the condition of the chain and sprockets by inducing damaging harmonics. If the misfire is caused by a preignition event, the stresses on the sprockets and chains can be extreme. The cause of a misfire needs to be diagnosed either before or after the timing system is repaired. If the engine has suffered a catastrophic failure that has caused the engine to stop suddenly, damage has occurred. Therefore, the full system should be replaced.

In the event that a well-maintained clean engine needs timing system repair, the reuse of sprockets can be considered. But keep in mind the fatigue life of the system depends on the pairing of the fatigue life of each individual component. don’t let the fatigue life of the sprockets limit the repair longevity of the system as a whole.

Cloyes recommends that all components the timing system be replaced at the same time – this includes the sprockets that are included with most timing chain kits and VVT systems when necessary. For more information on your technical questions visit our tech center at

This video is sponsored by Cloyes.

You May Also Like

EV Safety Basics on the Shop Floor – Part I

It’s critical to utilize OEM service information and procedures for each and every hybrid or EV.

Electric vehicle safety — it’s a topic that’s on a lot of our minds. High voltage can be frightening because it can kill, but it shouldn’t scare you away. The reality is EV technology is a safe technology. As long as you understand it, respect it, and follow established safety guidelines for EV service. Let’s look at how to establish safety basics in your shop.

Empowering the Automotive Aftermarket Through Collaboration

Distributors, manufacturers, training institutions, associations and service providers all help automotive professionals stay ahead in a market that is constantly evolving with new technologies, trends and customer demands.

Understanding LSPI & Engine Oil

Using the correct manufacturer-recommended oil is crucial for peak performance and long-lasting engine health.

Serpentine Belt and Drive System Maintenance

Properly maintaining the entire drive system prevents premature belt wear and system failure, ensuring customer satisfaction and vehicle reliability.

Randy Breaux, Group President, GPC North America, Talks to AMN Drivetime

At NAPA, “Breaux Knows” business relationships, ABCs to avoid, and serving the automotive professional.

Other Posts
Dealing with Deposits to Boost Engine Life

Valvoline didn’t think an engine oil that removed deposits was possible … until they did it.

BMW Spark Plug Replacement

Here are a few things that you need to know before replacing spark plugs in a BMW.

How Modern Car Sensors Optimize Performance and Emissions

Learn how Standard ensures accuracy, speed, and durability in their sensors to maximize engine performance and efficiency.

Five Tips for your Next Wheel Bearing Job

These practical tips are designed to save you time and frustration, ensuring a smooth, noise-free outcome for your customers.