When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Okay, so my clutch has a bit of a rattling noise – only at idle, and it disappears once the clutch is disengaged, ie. pedal is pushed in. Discussions with local Porsche independent specialist indicates flywheel may be the issue. Car drives fine otherwise. Quoted price is C$1,300 for flywheel alone. Shop’s policy on parts is that I can bring in whatever, but they won’t warranty the parts. I’m fine with that, I would buy decent stuff anyway.
All of which leads to some confusion on the LuK part numbers and compatibility with OE. OE part number is 997 114 012 01. Rockauto has best price on the flywheel, but shows LuK part number DMF024 as compatible,but LuK website shows part number DMF115. Google search of Rennlist turns out DMF115 on one for sale ad, suitable for 997.1. LuK website itself does not show corresponding OE part numbers to check compatibility, nor if 115 supercedes 024.
Any ideas? Anyone order a LuK flywheel itself? Rockauto’s price for the 115 is nearly half, and the 024 is a third, of what the local shop will supply, so it’s worth the hassle to figure it out. I have a feeling that the DMF024 is for the 996 and 997 3.4 and 3.6L cars. But I’m not sure if the DMF115 is for 3.8L 997.1s and 997.2s, or if the 997.2s have a different flywheel part number. Now quite confused over three little numbers.
I did that, as that was my first thought. However, the forums discussion makes me feel it is not the throw out bearing (which would be replaced anyway as part of the service) because apparently the symptoms of that going bad are noises upon clutch disengagement, ie pedal pushed in, and the noises are whirring or screeching as the bearing moves around. Here it's the opposite, I only have noises when the pedal is not pushed on, ie clutch engaged but not in gear. Whilst driving, in gear, there is no noise. Only idling with the car motionless.
More intense googling led to a PDF of the ZF Sachs catalog. They list the same flywheel part number for a 3.6L 996 or 997 as for a 3.8L 997 (baller Mezgers excepted).
Interestingly, their catalog also lists clutch disc specifications. For a 3.6L 997, the clutch disc OD is 9 7/16", the ID is 1 1/16". For a 3.8L 997, the OD is the same, but the ID is 1", so clearly there is some difference there.
I am going to call LuK USA tomorrow to see if they can shed light on this DMF024 vs. DMF115 business.
Which may lead to the question - why not just buy Sachs? Price is C$400 more, and LuK is OE anyway (I think??).
Spoke with a tech guy at the Schaeffler Group, LuK's parent corporation. He assured me that the correct part number for 3.8L 997.1 is DMF115. The DMF024 corresponds to 99-08 3.6L cars. Sorted!
Sorry i'm late to the party on this one. Do you have an aftermarket flywheel or is it stock? If you have a lightweight aftermarket flywheel then it's probably the normal noise it makes.
Mine does the exact same thing and it's only sometimes if I'm not pushing in the clutch.
Stock as far as I know, but pretty certain it is stock. It's weird, when I first start up the car, it's normal. Only after driving around for a while will the noise appear.
Just to follow up on this thread. I have not purchased a new flywheel. I may still do so, but leaning towards not. The local specialist was kind enough to have a listen to my car, and also had it up on a hoist. The tech (not the service advisor mind) figured it was release bearing too, and that a buggered up dual mass flywheel makes loud banging noises if going south.
I mentioned that the forums state that release bearing failure noises are usually with the clutch pedal depressed, ie opposite of what I have, but he figured that the noise could still be the bearing. He said the pressure plate fingers could wear unevenly, causing the bearing to be out of kilter slightly. Only way to check is to pull the trans, but if we're going that far, then for sure a new clutch kit should go on. Not sure yet about flywheel though. For now, I'm gonna leave it. He did also suggest checking MTF levels, but I'm doubtful its related to the trans proper, given that the noise disappears when the clutch pedal is in.
Sorry to bring up such and old thread, but going through this debacle now. Has anyone purchased a LUk flywheel for their 997 turbo? Even Porsche OEM sites have 2 different part numbers for the stock flywheel on an 08 Turbo. I don’t want to order the wrong one and then be stuck at shop with wrong flywheel...
I think your best bet is to call Schafler Group (per my post #6). Mezger engines will have different flywheels from the more pedestrian wet sump engines. Good luck, they were very helpful when I called.
As as an aside, I ended up buying a whole new NOS flywheel and clutch kit from another Rennlister, including the LuK flywheel. All went in and the clutch has been happy ever since, been a couple years now.
06-17-2015, 05:48 PM
Flywheel stuff
