997.2 Turbo crank pulley

[911 Inventor]

I am new to this group and I have a new to me 2011 997.2 Turbo cab manual. After about 500 miles of driving I would get a Ting Ting Ting noise from the rear of the engine upon hard stopping only. Turns out the out sleeve (steel ring) of the crankshaft pulley has come off of the pulley and is loosely trapped between the pulley and the bracket that hold the engine to the rear engine mounts. Hard stopping shoves it onto the spinning pully, ting ting ting, acceleration slides it back out of the way no noise.
Questions:
1. Does the pulley need to be replace, or does the ring just need to be pressed on to the
pulley.
2. Is it a harmonic dampener or just a pulley with a steel sleeve to keep the serpentine
belt from rotating off.
3. Does the engine need to be dropped or just the muffler removed.

Any help would be greatly appreciated

[Van B.]

Photos would help. Crank pulley should be one piece aluminum

[911 Inventor]

It is difficult to get a picture since it has not been taken apart, but you can see the steel sleeve in both pictures. One shows sleeve forward and the other shows sleeve back. I can't see a reason for the sleeve unless it is some sort of balancer or it is used to keep the serpentine belt from coming off the pulley.

[Van B.]

Ah so it looks like those years have a pressed on ring as a damper. If there’s rubber in there then it’s acting as a harmonic damper. I’d just buy a good used one off eBay or something. Not sure what caused that one to come off, but I’ll bet money that if you try to press it on, it will come off again.
The car will also run fine if you just get rid of the ring. But, harmonic dampening is nice. My 996 just had a plain aluminum pulley and when I did my light weight flywheel, I added an RSS harmonic crank pulley and it made a noticeable difference in transmitted engine vibration.

I bet you can support the engine and unbolt some stuff to move that engine carrier back so you and slide the pulley out of there. If that year model still uses the single bolt, then you’re gonna need some big daddy torque wrench to hit your number plus extra degrees of rotation.

[911 Inventor]

Thanks Van
Where would the rubber be? On the ID of the steel sleeve? Not sure how it acts as a harmonic dampener. I am assuming it must be weighted so the relocation of the sleeve clockwise onto the pulley must be important. I would agree if it came off once it would come off again. Not much load in the direction that it came off, so it must not have been attached very well. One would think a lousy set screw or tack weld would have helped, as it does not seem to touch anything.
Thanks again...looking forward to getting it back on the road

[Van B.]

Full disclosure, I haven't messed with your model. But I created a custom belt setup for my car and I used some turbo components. So I have studied what Porsche did different on the turbo models.
The pictures and parts I saw were an aluminum pulley with a steel damper ring pressed on. And that consists of two steel rings with vulcanized rubber injected between them.

[911 Inventor]

I see, it must dampening out torsional vibration with the vulcanized rubber. Odd it came apart as the car only has 13,000 miles. Couldn't find a pulley on ebay. Do you think I am better off with an aftermarket dampener?

[Van B.]

Before you go shopping, you need to get that ring in your hand and see what went wrong. Maybe the rubber separated from getting old and dried out, or maybe something else. But, I would finish diagnosing first.