New clutch - jumpy throttle when starting

[atownusa]

I'm hearing what sounds almost like debris when the clutch is being engaged (in gear). I think it's a bit worse when cold, but can't be certain as I hear it most when the sound is being echoed off walls or in the garage.

Mechanic said that it could be new style of clutch vs. the old, but I'm feeling like something is amiss here. Normal, abnormal, red flag?

Here's a video to hear what I'm hearing: https://www.dropbox.com/scl/fi/268dcel8dxzqm95pevgaq/IMG_8243.mov?rlkey=x71d0uaqliatz2zx6idnn9hos&dl=0

[kevbo]

I just did mine a few months ago and it doesn't make sounds like that - I didn't use a performance upgrade tho. Sounds like there is something loose or loose material in there. Maybe a defective part. Odd

[atownusa]

Originally Posted by kevbo

I just did mine a few months ago and it doesn't make sounds like that - I didn't use a performance upgrade tho. Sounds like there is something loose or loose material in there. Maybe a defective part. Odd

Thanks for the info. Do you have the part number of the clutch kit that you used?

[kevbo]

For my 1986: Part#: 915-116-911-00-M38 from our host.

I had my flywheel resurfaced by a trusty air-cooled shop and I bought new bolts all around (not supposed to re-use old bolts).

[atownusa]

Just to close this case out (and help anyone in the future)... turns out that a flywheel bolt head had broken off and was rattling around in there. See pic attached.

Not sure if it's a freak happening or if it's an installation mistake, but hopefully it's smooth from here-on-out!

[proporsche]

good find..either wrong torque on installation or old bolts.Have you replace the others?
Ivan

[yelcab1]

Clutch shuddering --> Flywheel issues --> O2 sensor --> idle valve --> Loose connector on fuel pump.

Did we go around the world?

[yelcab1]

Originally Posted by atownusa

Just to close this case out (and help anyone in the future)... turns out that a flywheel bolt head had broken off and was rattling around in there. See pic attached.

Not sure if it's a freak happening or if it's an installation mistake, but hopefully it's smooth from here-on-out!

That is an installation fault BY THE MECHANIC. During installation of the flywheel, if there is any doubt, you always use new bolts. Some people / mechanic out of sheer laziness would use impact wrench on the bolts and stress them to the point of breakage.

I know that SC and Carrera flywheels bolts are supposed to be re-use-able. But, really, when it's that deep in the belly of the beast, just spend the $20.

[yelcab1]

Originally Posted by pmax

Pay special attention to what JW (and Ivan) said prior. Saving the extra $1K or so is understandable but ...


... .

My machine shop now charges $300 to grind a flywheel, and I have to wait a week. Between that and $600 for a new flywheel, I would just buy new and be done. Get the car off the lift, and on to the next.