Chain noise?

[Boxstard]

Originally Posted by The Radium King

only when engine loaded? probably driveline related. only makes noise when clutch engaged? driving down the road at 2400 rpm and engine is making noise, push clutch in and what happens? shift into neutral and keep the engine at 2400 rpm and what happens?

Clutch in, noise gone.... I can not reproduce this noise not matter what rpm with the gear in neutral and car standing still. Only when car is running in gear, mostly in 3rd and 4th on the road, at steady speed with very delicate, slight throttle opening. Taking the foot off or pushing the pedal just a little instantly kills the noise, and back to the slight opening it comes back, very repeatable.

It seems as if combination of UDP, 996 TB and maybe 997 engine mount of recent changes is causing some kind of isolated system instability that the factory ironed out, and it woke up this noise ghost?

[jvfante]

Originally Posted by Boxstard

Clutch in, noise gone.... I can not reproduce this noise not matter what rpm with the gear in neutral and car standing still. Only when car is running in gear, mostly in 3rd and 4th on the road, at steady speed with very delicate, slight throttle opening. Taking the foot off or pushing the pedal just a little instantly kills the noise, and back to the slight opening it comes back, very repeatable.

It seems as if combination of UDP, 996 TB and maybe 997 engine mount of recent changes is causing some kind of isolated system instability that the factory ironed out, and it woke up this noise ghost?

The clutch in making the noise go away seems to be pointing to your throw out bearing or perhaps a rattle/vibration in the release arm or spring.

As an aside, I had all sorts of fits with shifting in 1st gear making horrible vibrations until I replaced the single front engine mount. It's a cheap fix easily done in your garage.

[Boxstard]

Originally Posted by jvfante

The clutch in making the noise go away seems to be pointing to your throw out bearing or perhaps a rattle/vibration in the release arm or spring.

As an aside, I had all sorts of fits with shifting in 1st gear making horrible vibrations until I replaced the single front engine mount. It's a cheap fix easily done in your garage.

Clutch feels good and no vibration/ rattle is felt through the pedal.

As mentioned earlier, I installed new 987 engine mount with new side pads too, so that may not be it... even though it seems as if I started noticing this noise after new mount and UDP installation.

[Lew]

Originally Posted by jvfante

The clutch in making the noise go away seems to be pointing to your throw out bearing or perhaps a rattle/vibration in the release arm or spring.

As an aside, I had all sorts of fits with shifting in 1st gear making horrible vibrations until I replaced the single front engine mount. It's a cheap fix easily done in your garage.

Good to hear you pointing to the Release Bearing. Bell Housing condensation will rust a release bearing over time and it will rattle. With the Engine running clutch out it will rattle when shutting the engine down. Clutch in no rattle when shutting down the engine. DMF I doubt it's the problem.