dual mass flywheel gone bad??

[sb01box]

from time to time, mostly in 2nd gear while "coasting" to a stop, I can hear ticking. noise. it's when the engine rpm is 1K to 2K and the brake is starting to dominate over engine braking.
if the dampener in the dual mass flywheel is shot, would it make this noise.
car is 01 5 speed, 125K miles on original clutch.
thanks in advance
tad

[JFP in PA]

The dual mass flywheel is incapable of making any noise, other than the scream owners let out when they find out how much they cost to replace. From your description, it would appear to be more of a bearing issue in the driveline, but it is impossible to diagnose without actually seeing the car. Your best bet would be to take it to a good Porsche shop and have them look at and listen to the problem………..

[sb01box]

JFP in PA. thanks for your input.
i kinda know how a bad CV joint and axle bearing sound like. it's more like a loose spring in the traditional clutch disc is flopping around.
under load, no noise. I hear it more from the right side.

[sb01box]

Originally Posted by sb01box

JFP in PA. thanks for your input.
i kinda know how a bad CV joint and axle bearing sound like. it's more like a loose spring in the traditional clutch disc is flopping around.
under load, no noise. I hear it more from the right side.

update: outer cv boot split. guess i need to re-think. I know what a bad CV joint sounds like on a front wheel drive car when turning, but not when it is going straight (as in the cv joints on the drive shafts of Boxster.

[sb01box]

so I got the CV boots replaced on both sides along with water pump.
The rattle is still there. only hear it when the drive train is unloaded. Namely the car is in gear and only when there is no net power transmitted by the engine to the wheels or wheel to the engine.
any thoughts?
thanks in advance
tad

[shadrach74]

Originally Posted by sb01box

so I got the CV boots replaced on both sides along with water pump.
The rattle is still there. only hear it when the drive train is unloaded. Namely the car is in gear and only when there is no net power transmitted by the engine to the wheels or wheel to the engine.
any thoughts?
thanks in advance
tad

If you were getting a clicking sound from the CV Boot/joint, then there is a good chance the joint is shot... Was the joint dry? Putting a new boot with fresh grease on a worn joint is pointless. I have heard boots slap together where they've split which simply necessitates boot replacement. Did you make sure that all the components of the axle were serviceable before you installed new boots?

[sb01box]

Originally Posted by shadrach74

If you were getting a clicking sound from the CV Boot/joint, then there is a good chance the joint is shot... Was the joint dry? Putting a new boot with fresh grease on a worn joint is pointless. I have heard boots slap together where they've split which simply necessitates boot replacement. Did you make sure that all the components of the axle were serviceable before you installed new boots?

performed by the dealer. no problem with the CV joints

[sb01box]

I would like to post this question differently.
having read many threads on flywheels, what sound or "feel" would indicate a DMFW going bad?
thanks much

[harryrcb]

I don't believe they make a noise you might get a slight hesitation on quick take off but most likely you will not be able to tell. the one sure way is drop the transmission and measure the movement of the flywheel plus check the condition of the clutch surface area

[sb01box]

Originally Posted by harryrcb

I don't believe they make a noise you might get a slight hesitation on quick take off but most likely you will not be able to tell. the one sure way is drop the transmission and measure the movement of the flywheel plus check the condition of the clutch surface area

Thanks for your input.
Would I be able to "feel" the play if I jack up one rear tire, have the tranny in gear and try rotating the tire?

[JFP in PA]

No, you would not be able to feel it for multiple reasons. The movement at the flywheel is only a few millimeters; there is way too much other slop in the driveline to detect it at the wheel, even with gear ratio multiplication. It has to be measured at the circumference of the flywheel to do it accurately.

[harryrcb]

As JFP said - NO

[sb01box]

thanks much for all your inputs.
it turned out to be locked alternator pulley playing havoc with the serpentine belt tensioner.
examined the pulley, no free wheeling. replaced the pulley, checked all 3 rollers and just got back from 14 mine drive. no more noise.

[986Porsche986]

Good to know you got it fixed. Thanks for the update on the problem.