Bad Engine Rocker Arm Symptoms, Plus Replacement Recommendations

Your vehicle has hundreds of parts that work together to make sure the engine runs smoothly. Gearheads might know each one, but for the average driver, it’s normal not to know every single part. However, that doesn’t mean you shouldn’t try to understand your vehicle more, especially if it shows signs that one (or more) of its parts is not working as it should.

In this article, we’ll be talking about the rocker arm, what it does, the signs that it’s time to replace it, and more.

What Does a Rocker Arm Do?

The purpose of a rocker arm is to move the intake and exhaust valves when the camshafts are not mounted directly above them. They are most commonly used on engines without overhead camshafts, where push-rods are located between the camshaft and rocker arms.

The rocker arm is designed to reduce the cam follower and push rod’s movement while maintaining the required valve lift. To do this, the most rocker arms  have a motion ratio of around 1.5:1.

Can You Drive With a Bad Rocker Arm?

A bad rocker arm can result in serious drivability issues, so it’s not advisable to drive around if yours is faulty unless you’re going straight to the repair shop to get it fixed.

A loose or broken rocker arm can affect the valves’ operation and, consequently, the engine’s overall performance.

Symptoms of a Failing Rocker Arm

If left unaddressed, a bad rocker arm can render your vehicle undrivable. Watch out for these symptoms that could point to a failing rocker arm.

Clicking or Ticking Noises

Clicking or ticking sounds are one of the most common symptoms of a worn-out rocker arm. In most cases, you’ll hear these noises coming from the top of the engine. However, keep in mind that other parts can also produce the same noises, which is why it’s best to have your vehicle checked by a certified mechanic for a proper diagnosis.

A damaged hydraulic lifter could exhibit the same symptoms as a failing rocker arm. This part pushes the pushrod into the rocker arm.

Illuminated Check Engine Light

An illuminated check engine light can mean a lot of things一including a damaged rocker arm or other related issues. It could mean that the powertrain control module (PCM) was able to log rocker arm-related trouble codes like the P2647 code and P2646 code, which are applicable to electronically controlled rocker arms.

Engine Misfire

The rocker arm plays an important role in the fuel combustion process. If it’s damaged, your vehicle could exhibit symptoms like stalling or misfiring.

How Much Does It Cost to Replace a Rocker Arm?

A rocker arm replacement can cost anywhere between $100 and $500, depending on factors like the brand and the vehicle it’s designed for. On some vehicles, you’ll need to replace the entire rocker arm assembly. Labor costs for this type of repair can range from $80 to $200 per hour, depending on your vehicle’s make and model.

Types of Rocker Arms

There are three types of rocker arms based on how they were manufactured: forged, cast, and stamped steel.

Forged

Forged rocker arms are the strongest among the three because they require expensive manufacturing operations. They usually have bushings and bearings that help reduce friction and increase durability.

Cast

Cast rocker arms are not as strong as forged rocker arms, but they’re satisfactory for passenger-vehicle service. They also cost less than forged rocker arms.

Stamped Steel

Among the three types, stamped steel rocker arms are considered the most cost-effective and lightweight type.

Rocker Arm Mounting Styles

Rocker arms have three mounting styles: shaft-mounted, stud-mounted, and pedestal-mounted.

Shaft-Mounted Rocker Arms

Shaft-mounted rocker arms are engine rocker arms that are mounted on a shaft that runs the full length of the cylinder head. This style works well under high speeds because the shaft offers an extremely strong and stable platform for the rocker arm.

Stud-Mounted Rocker Arms

A stud-mounted rocker arm is typically found on overhead valve engines. This style positions each rocker arm to a stud that’s pressed or threaded into the cylinder head. Although this style is reliable and inexpensive to manufacture, it tends to look less stable than a shaft-mounted rocker arm.

Pedestal-Mounted Rocker Arms

This style features two stamped steel rocker arms on a pedestal that’s attached to the cylinder head. The pedestal is usually made from aluminum and secured with one or two bolts.

Featured Engine Rocker Arms

A high-quality rocker arm is important in ensuring your engine’s optimum performance. Check out the rocker arm replacements from some of the best brands below.

Crown Rocker Arms

Crown is the leading manufacturer of OEM Jeep replacement parts. This rocker arm kit comes with 12 rocker arms and six pivot kits for a hassle-free installation. It also comes with a one-year or 12,000-mile Crown limited warranty.

DNJ Rocker Arms

This rocker arm from DNJ follows OE specifications to provide a direct-fit replacement for your damaged rocker arm.

Proform Rocker Arms

This rocker arm from Proform features an extra long slot to eliminate rocker-to-stud interference when using high-lift cams. It comes as a set of 16 stamped steel rocker arms, grooved balls, and nuts.

Final Thoughts

It’s dangerous to drive with a bad rocker arm, so don’t think twice about replacing it. Driving with a failing rocker arm can also do some serious damage to the engine. Shop for a rocker arm replacement and take your vehicle to an auto repair shop right away to restore your ride’s excellent performance and stay safe on the road.

Replacement Rocker Arms For Your Vehicle

Bad rocker arms can make loud ticking sounds inside your engine that can lead to engine misfires. Don’t let misfires ruin your engine and replace your faulty rocker arms before they fail. Good thing CarParts.com can supply you with the right rocker arms to restore your engine.

You don’t need to search multiple brick-and-mortar stores or websites to find the right rocker arm for your engine. You can simply enter your vehicle’s year, make, and model in our vehicle selector, and you’ll see a section of compatible parts, including rocker arms, from the leading aftermarket brands. CarParts.com has competitive pricing, so you can get the rocker arms for your engine without breaking the bank. And since our warehouses are strategically located nationwide, you can receive your order in no time.

Don’t let a bad rocker arm lead to more severe engine issues. Browse our selection of high-quality rocker arms here at CarParts.com and order today!