Mercedes-Benz CL65 AMG Engine Makes A Ticking Noise

Common Causes of Ticking Noises in Your Mercedes-Benz CL65 AMG Engine and How to Address Them

Find Repair Location
Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
12% chance it's the
Exhaust Leak
0%
88% chance it's
Something else
The most common reasons a Mercedes-Benz CL65 AMG engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak.
  • Exhaust Leak: A damaged exhaust manifold or a loose connection in the exhaust system can cause an exhaust leak, resulting in increased noise and potential loss of engine power.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a Mercedes-Benz CL65 AMG engine makes a ticking noise?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

If the drive belt idler pulley fails, there will be a very audible chirping noise from the front of the engine. This is because the idler pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to slip off. If the belt falls off, the accessory that it drives will no longer function. For instance, if the alternator belt idler pulley fails, the alternator may stop functioning. Also if the pulley begins to wobble, allowing slack in the belt, it will make an extremely loud squeaking or screeching noise, especially on cold starts. This is the belt slipping on the crankshaft pulley, and will require belt replacement once the idler pulley is replaced.

If the drive belt tensioner fails, there will be a very audible chirping, grinding, or rattling noise from the front of the engine. This is because the tensioner pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to lose tension, or break. If the belt falls off, the accessory that it drives will no longer function. Also, if the tensioner spring fails, allowing slack in the belt, it may make an extremely loud squeaking or screeching noise combined with a rattle as the tensioner bounces back and forth under load. The squealing noise is the belt slipping on the crankshaft pulley, and will require belt replacement once the belt tensioner is replaced.

An engine leaking oil does not always make a puddle on the ground. A burning smell may be noticed from the front of the vehicle after driving. This is because engine oil leaks may fall onto hot engine components, especially the exhaust manifold, and burn off before making it to the ground. This poses a risk to the engine because the leak going unnoticed may deplete the engine oil reserve, and lead to an oil starvation issue. Some engine oil leaks only occur while the engine is running, so the leak may be larger than the small spot on the ground makes it seem.

Noises can be accompanied by many annoying or worrisome sensations. Consider the noise of grinding brakes, the noise sounds much like the brake pedal and steering wheel feel. This is important, as random noises can be difficult to replicate without knowing when the sound occurs, what must be done to make the sound, and what sound it is. Any professional technician can replicate and diagnose most noises, but to ensure the vehicle is more quickly diagnosed, make sure you tell your technician these three pieces of information.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

Troubleshooting Engine Ticking Noise in a Mercedes-Benz CL65 AMG

When troubleshooting engine ticking noise in your Mercedes-Benz CL65 AMG, start with the most straightforward checks to identify the source of the problem. Begin by inspecting the engine oil level and pressure, as low oil can lead to inadequate lubrication, resulting in ticking sounds. If the oil level is low, topping it up with the recommended type can often resolve the issue. Next, pay attention to the lifters; a common cause of ticking noises, especially if the sound diminishes as the engine warms up. If the noise persists, monitor the engine's temperature, as some Mercedes engines may produce a "diesel-y" knock until they reach optimal operating temperatures of around 80-100°C. If these initial checks do not resolve the ticking, it may indicate a more serious issue, such as a knocking noise that requires professional assessment. Always prioritize these simpler diagnostic steps to potentially save time and resources before moving on to more complex repairs.

What Could Cause a Ticking Noise in a Mercedes-Benz CL65 AMG Engine?

When diagnosing a ticking noise in your Mercedes-Benz CL65 AMG engine, it's essential to consider several common problems that could be at play. One of the primary culprits is low oil level or pressure, which can lead to insufficient lubrication of engine components, resulting in a ticking sound. Additionally, issues with the ignition system, such as faulty spark plugs or ignition coils, can also manifest as a ticking noise. An exhaust leak is another potential source, as escaping gases can create a distinct ticking sound. Furthermore, problems with the timing chain, which is crucial for synchronizing engine components, may also be responsible for the noise. Valve train clutter, often caused by worn or damaged components, can contribute to irregular sounds as well. Lastly, don't overlook the air blend motor, which can produce ticking noises if it malfunctions. Addressing these issues promptly is vital to maintaining your vehicle's performance and safety, so be sure to conduct a thorough examination and utilize the right tools for an accurate diagnosis.

Why is it Critical to Address Engine Ticking Noise in a Mercedes-Benz CL65 AMG?

Addressing engine ticking noise in a Mercedes-Benz CL65 AMG is not just a matter of convenience; it is a critical step in ensuring the vehicle's longevity and safety. Ignoring these sounds can lead to severe consequences, including the escalation of minor issues into major mechanical failures that could compromise engine performance and safety. The ticking noise often signals underlying problems, such as insufficient lubrication or worn components, which, if left unchecked, can result in increased wear and tear, ultimately leading to costly repairs. Moreover, the safety of both the driver and passengers is at stake, as unusual engine noises may indicate potential hazards that require immediate attention. By prioritizing the resolution of engine ticking noises, owners can safeguard their vehicle's performance, prevent further damage, and maintain its resale value, making it a crucial aspect of responsible vehicle ownership.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

Mercedes-Benz CL65 AMG Engine Making Ticking Noise