Skip the auto shop - Our mechanics make house calls

Q: Knocking sound in engine when clutch is up

asked by on

When the clutch is up, there is a knocking sound in the engine. When the clutch is pressed down, the knocking sound goes away. The car pulls slightly to one side and there is a growling noise when I change gears and accelerate and it shakes into idle. Several months ago the clutch was changed, but it still feels rough in the pedal. I’m wondering if the mechanic only changed the clutch and did not change the dual mass flywheel. Or it might be a release bearing, which hopefully I could change myself without the clutch or do both have to be changed at the same time?

A: When the clutch is replaced, generally the ...

When the clutch is replaced, generally the clutch disc, pressure plate, throwout bearing, and pilot bearing are all replaced. These usually come in a kit, and when they are replaced, the flywheel is usually refinished based on need. If the throwout bearing has failed, it usually makes noise when the clutch pedal is pushed in but not when it is not pushed. Common causes of this would be a failed axle shaft, CV joint failure, or suspension failure. A qualified technician, such as one from YourMechanic, would be able to diagnose this knocking sound and perform any repairs required.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I replace the crankshaft position sensor and where is it located on the engine?

In order to replace the crankshaft position sensor you have to remove the passenger tire and inner plastic fender to get access to the crankshaft pulley. The sensor is installed in the engine to the left of the crankshaft pulley....

Q: Can't shift gears while vehicle is running

Two things come to mind. A worn clutch or a bad slave cylinder. If there are no hydraulic leaks visible, the issue is most likely a worn clutch. If this the case, the clutch along with the pressure plate, throwout...

Q: Oil leaked heavily out of my car while driving home while making a revved up noise.

Hi there. Check the engine for any oil leaks that are visible to you. Check the front seal, the oil pan, the oil filter, the oil drain plug (make sure its tight), the valve cover gaskets, the oil cooler lines,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...