Drivetrain Rattle

[woodsman]

I think the clutch disc is bouncing off the FW instead of pushing against it. This because the friction at contact is so great relative to the clamping force of the pressure plate. If I dump mine it sticks and there's no banging. But if I'm gradually releasing than it works okay for a bit but THEN starts banging (bouncing?). When slipping I think most clutches would be transmitting a constant rotational force but mine heats up and STICKS ( refusing to slip). Revving to 2-3000 rpm improves things on my car as well. My disc is a segmented, Kevlar reinforced one. It is supposed to last a lot longer even under high horsepower applications. I say it's too much of a race clutch for me. The next time it's apart I'll put in an organic sprung one if I can find one. On my DD I don't need to give throttle while releasing the clutch but I'm learning to do so when in the P-car. What type of disc have you?

[JAAY]

A bearing could have let go in the tranny. There are sealed bearings in there like the ims so I've been told. I am on my third tranny due to a rattle. My latest one I think I took a tooth off a gear. I haven't opened it up yet to inspect it.

[Daniel R]

Originally Posted by JAAY

A bearing could have let go in the tranny. There are sealed bearings in there like the ims so I've been told. I am on my third tranny due to a rattle. My latest one I think I took a tooth off a gear. I haven't opened it up yet to inspect it.

Yes, this is the type of thing I am dreading. Still, a $5k fix and my 2nd gear problem would be gone too... it is the only thing that prevents my wife from driving the car, the fact she misses 2nd gear 1 shift out of 5. It would save me a lot of stress the times when I need her to drive home after those long and lingering Friday afternoon lunches with the obligatory several bottles of red wine.

Every cloud...

[Daniel R]

Originally Posted by woodsman

I think the clutch disc is bouncing off the FW instead of pushing against it. This because the friction at contact is so great relative to the clamping force of the pressure plate. If I dump mine it sticks and there's no banging. But if I'm gradually releasing than it works okay for a bit but THEN starts banging (bouncing?). When slipping I think most clutches would be transmitting a constant rotational force but mine heats up and STICKS ( refusing to slip). Revving to 2-3000 rpm improves things on my car as well. My disc is a segmented, Kevlar reinforced one. It is supposed to last a lot longer even under high horsepower applications. I say it's too much of a race clutch for me. The next time it's apart I'll put in an organic sprung one if I can find one. On my DD I don't need to give throttle while releasing the clutch but I'm learning to do so when in the P-car. What type of disc have you?

It would make for a very big coincidence if this were the case, as the noise was exactly the same with the old dual-mass and toasted clutch, also, the noise developed when the old clutch still had 20% left in it. Then again, coincidences do happen.

The clutch is a HD pressure plate and a high-friction, organic disc. I didn't go with the kevlar discs and I am glad. It is annoying enough in traffic with the setup I have and I rarely use it for what it is designed to do. I must admit that I like the LWFW although my tolerance for discomfort and NVH is probably greater than most.