A Rocker Arm Replacement cost in Mission Viejo in 2024

The average cost for a rocker arm replacement with CarAdvise is $316 and the range is generally between $12 and $1662.

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AVERAGE COST IN Mission Viejo

A Rocker Arm Replacement costs by shop in Mission Viejo.

CarAdvise Customers save an average of $63 on A Rocker Arm Replacement.

POPULAR VEHICLES

Average cost of A Rocker Arm Replacement for popular vehicle models in Mission Viejo:

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THE IMPORTANCE OF A Rocker Arm Replacement

What is a rocker arm and how does it work?

A rocker arm is a component of the valve train inside a four-cycle internal combustion engine, such as the one found in most cars, trucks, and SUVs. Similar to a teeter totter, each rocker arm tips to actuate an engine valve.

Your engine relies on a set of pistons that pedal a crankshaft the way your legs might pedal a bicycle. The pistons move in response to rapidly expanding combustion gases in their respective cylinders. Each cylinder is sealed air tight so that pressure can build up inside, so a set of valves at the top of each cylinder open and close in order to allow air and fuel to enter the combustion chamber (intake valves) and allow exhaust gases to escape (exhaust valves).

The intake and exhaust valves are timed and driven by the camshaft. On older engines, lobes on the rotating camshaft move a set of pushrods up and down. The pushrods, in turn, “push” on the ends of the rocker arms. In response, the spring-loaded rocker arms tip to push the valves open in the proper sequence and at just the right time. Modern “overhead cam” engines are set up a bit differently, eliminating the need for a pushrod and allowing the rocker arms (sometimes referred to as rocker followers) to ride directly on the camshaft itself.

An engine will feature at least two, and sometimes four, valves per cylinder, half for intake and the other half for exhaust.

COMMON SYMPTOMS

How do I know if my vehicle needs a rocker arm replacement?

Worn or malfunctioning rocker arms can prevent your engine from running properly. That is because they are placed directly in the valve train that controls how and when the intake and exhaust valves open and close. The timing of those events, along with ignition timing of the spark plugs and the precision timing of compression in each cylinder, are essential for peak performance - or even any performance at all.

If one or more rocker arms is bad and valve timing is affected, you will probably sense a change in engine performance, and you might hear the result as well. You can expect any of the following to happen with bad rocker arms:

Your engine runs roughly, shakes, and lacks power

The engine is hard to start

A check engine light comes on

Your vehicle fails an emissions test

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FREQUENCY OF INSPECTION

How does a technician perform A Rocker Arm Replacement ?

Rocker arm replacement procedures differ from one vehicle to the next, depending on many factors, not the least of which is whether the engine is an overhead cam or overhead valve engine. Some engines have up to four camshafts and thirty two valves, each with its own rocker arm. Some require a significant amount of upper engine disassembly for access, including ignition and fuel system components.

To replace a rocker arm (or arms), a technician will take the following general (and oversimplified) steps:



  • Disconnect the negative battery terminal to cut power to the vehicle
  • Remove shields, guards, covers, or ducts to gain access to the valve cover or head cover
  • Remove the valve cover(s)
  • Loosen and/or remove camshafts (if necessary) to allow rocker arms to lift out (may require attention to ignition timing components, such as the timing belt(s) or chain(s)
  • Remove the rocker arm retaining nut (if equipped) and remove the old rocker arm
  • Insert the new rocker arm and retaining nut (if so equipped)
  • Reinstall the camshaft(s)
  • Reinstall the valve cover and torque all fasteners
  • Reinstall all shields, guards, covers, or ducts previously removed.
  • Verify the repair by road testing the vehicle until it warms up, and by checking for any abnormal noise or engine behavior

Other Questions Customers Ask

Why do rocker arms fail?
Rocker arms can fail due to a lack of engine lubrication, which can happen when the oil and filter are not changed regularly, or if substandard oil is used. Manufacturing errors can also contribute to rocker arm failure. Some simply wear out with age and use.
How many miles do rocker arms last?
When an engine receives proper and regular maintenance, the rocker arms can last the lifetime of a vehicle. You can expect 150K-200K miles or more from a set of rocker arms. If, on the other hand, you ignore routine maintenance, such as frequent oil changes with quality products, or if you tend to abuse your engine, internal wear can shorten the lifespan of the rocker arms and other internal engine components.
Can rocker arms cause ticking?
In older engines, rocker arms were adjustable and could cause a ticking sound if they fell out of adjustment or were misadjusted (and loose) during service. In modern engines, however, the rocker arms are typically not to blame if a ticking is heard, but rather the components around the rocker arms that are wearing out, such as a hydraulic lifter.

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