"Thud" noise when pressing clutch?

[CX5_Pete]

Hello all,

Have had my CX-5 couple of months now and less than 5k miles. I am starting to notice a thud noise coming from beneath the vehicle when I press in the clutch at certain stops. I've ruled out the hill start assist because this happens on perfectly level ground. It doesn't happen all the time. I notice it most when I am at a light, while in neutral, in preparation to take off I will press in the clutch and as soon as the clutch is pressed in all the way a "thud" will sound. The thud sounds like a tennis ball hitting the underside of the car.

Is this normal? Is it one of those Jinba Ittai moments where the car is preparing for something? I hope other manual owners can chime in. I belive there might be 2 others....

*I would post this in the engine and tranny section, but I don't think it gets as much traffic than this section. Moderators, if you exist, feel free to move this thread.

 

[piotrek91]

Mine also occasionally makes a thud sound in the same situation that you describe.
Usually, I'm also starting to move the shiftier towards first when it happens, so I've assumed that maybe it's the transmission input shaft spinning to a stop as first starts to engage, but the sound happens before I've actually shifted into 1st.

My other guess would be maybe a slightly sticky clutch disk? Maybe the disk occasionally sticks to the fly wheel/pressure plate and as the clutch is disengaged the diaphragm springs brake it free and make the thud sound?

Is it one of those Jinba Ittai moments where the car is preparing for something?

I don't think so.. The car "prepares" by slightly revving up the engine when you first let off the brake at a stop, but I haven't noticed any special "response" form the car to the clutch pedal being pressed/released.

 

[CX5_Pete]

My other guess would be maybe a slightly sticky clutch disk? Maybe the disk occasionally sticks to the fly wheel/pressure plate and as the clutch is disengaged the diaphragm springs brake it free and make the thud sound?

Makes sense.