23 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLoud wining sound
Reported or suspected cause
same regardless of clutch or gear position
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Discussions that report identifying a cause
1
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Reported cause
It was the same regardless of clutch or gear position.
Leading evidence: 'same regardless of clutch or gear position' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'same regardless of clutch or gear position' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check any excessive play' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Last bit of info, the clutch was replaced by the previous owner about 8k miles ago.
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Performed · outcome unconfirmed · Original poster
I then tested a few spots under the car, the variocam area was exhibiting the sound a little, but it wasn't too loud through the stethescope.
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Performed · outcome unconfirmed · Original poster
After somewhat realizing it's unlikely the transmission is causing the sound, I used a mechanics stethescope to try to decipher where the sound was originating from.
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Suggestion
i'd start with trans out first to check flywheel and the support bearing to the transmission rod (not sure of the english name for it) before engine out.
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Suspected cause
Also, if the belt has a sharp edge this is a sign the belt is not tracking properly and this is due to an accessory drive with too much bearing/shaft play.
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Suspected cause · Original poster
It sounds very similar to transmission whine, at first I actually assumed it was the bearings in the transmission (common issue on the 996's I've read) but since the noise is not dependent on being in gear, I think that isn't the cause.
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Suspected cause
If you suspect the noise is coming from inside the engine this is a pretty serious condition -- which may be addressable -- but the proper diagnosis and repair is probably beyond your capability.
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"Whining" ^ typo
You Tube
Wanted to get some input before I started to tear things apart, or jump to conclusions.
Background:
I've had my 2001 C2 for a few months now. It has 93k miles, no recorded history of the IMS bearing being completed (planning on upgrading it as soon as I have the time)
The Symptoms:
Inside, and outside of the car you can hear a very audible whining noise while the car is running, it is barely noticeable if at all at idle. As soon as you give the car some throttle, it becomes very apparent and obvious at as low as 1,500 RPM's. The whining gets louder, and higher pitched with more RPM's. It is not dependent on being under load or not, it makes the noise out of gear, in gear, clutch depressed, clutch released. It is strictly engine RPM dependent. It sounds very similar to transmission whine, at first I actually assumed it was the bearings in the transmission (common issue on the 996's I've read) but since the noise is not dependent on being in gear, I think that isn't the cause.
Stethescope Test:
After somewhat realizing it's unlikely the transmission is causing the sound, I used a mechanics stethescope to try to decipher where the sound was originating from. I first checked near the accessory belt. Every pulley sounded fine, with the exception of the alternator pulley. I attributed this to just the alternator making it's own noise, and noticed it sounded nothing like the whine while the Wife held RPM's at 1,500. I tested a few other areas around the top of the engine bay, and still couldn't seem to find the location of the sound. I then tested a few spots under the car, the variocam area was exhibiting the sound a little, but it wasn't too loud through the stethescope. I then tested a few areas where the transmission, and engine block meet, BINGO! 100% sure that this is where the sound is originating from, which from the little I know can only spell bad, expensive news.
It puts me back to the original Transmission whine idea, but this could be clutch related... possibly throw out bearing? or pilot bearing? I always figured those make certain noises at engaging or disengaging of the clutch usually... Another scary possibility is the IMS bearings starting to make some noise. I know when they completely fail they normally make more of a rattle... but I guess it may be possible they are whineing first. The sound has slowly been getting worse the past few weeks, I didn't notice it when I first bought the car, it may have exhibited a little bit, but most 911 H6's have a bit of a howl/ whine to them, just not this much.
Last bit of info, the clutch was replaced by the previous owner about 8k miles ago. It was done with the factory 3 piece clutch kit at Porsche of Honolulu 996-116-911-00 so the throw out bearing isn't too likely.
Any ideas?
Have hou run it with AC off? Mine makes exactly that noise, but with AC off...quiet. (Yes, I need to fix it but not critical right now to do so as it is -5 to -15 *C outside...)
Sound is not A/C dependent.
In a little bit when my "assistant" comes home, I plan on trying to get a more accurate idea of where the sound is coming from...
It shouldn't be transmission related if the noise is made completely out of gear, as well as in gear correct?
Correct! One way to remove accessories like a/C, power steering etc is to run it without the belt (only short periods, maybe 10s or so as there is then no water circulating to cool things down or generator charging battery).
With accessroies elimnated, the only other engine external thing I can think of is like a stone or bolt lodged between block and main front pulley (towards rear of car). Noise is the same with clutch engaged and not right which should elmnate transmission? Other than that...it is somewhere inside
i'd start with trans out first to check flywheel and the support bearing to the transmission rod (not sure of the english name for it) before engine out. In summary, I'd go to a specialist.
could be the water pump on the way out... it does not necessarily have to leak if its bad. But you did say you pulled the belt... my bad. Free bump for you...
I know this is old but I stumbled upon it during some searching to try to figure out why my car is making a whine noise. Mine sounds just like the video. Did you ever figure it out ccaarmerciill? Anyone else have the same sound?
Have you tried clutch depressed and transmission in gear vs. out of gear with clutch depressed? Even though the clutch is down I wonder if its possible that the transmission input shaft is still spinning with the engine is there is no real resistance (IE: in gear).
To answer your question earlier - the pilot bearing is spinning when the car is not in gear. The thrust / throw out bearing spins when you have the clutch depressed. Although in its resting state I wouldn't be surprised if it is still spinning, just without much load applied.
It sounds the same way regardless of clutch position and the sound seems to be coming from the same area of the car as in the video. if the pilot or throw out bearing fails you thing it will cause other issues too likely?
So I've decided I'm going to change the gearbox oil to see if it helps at all. Was thinking of going with Motul Gear 300 Gearbox Oil - 75W90. On amazon one says limited slip deferential and the other doesn't. Which do I need? I'm thinking the 1st one. Sorry... I'm a newbie. Mine is a C4 6 speed manual
Amazon
Amazon
Amazon
Amazon
You can change the transmission fluid if you want but I don't think it will help. I've run the gear oil in my cars for a long time -- up to 90K miles in at least one instance -- without the tranny making any noise.
(My advice would be to just use the Porsche fluid as it will be miscible with the fluid that is in the transmission currently and properly suited for use with the transmission. There is no need to question whether you need LSD compatible fluid or some other kind.)
When trying to identify a noise source be sure the A/C is off and the radiator fans are off. The fans run all the time the A/C is on even if the engine is cold.
If the noise is present from a cold start one thing you can do is remove the serpentine belt -- make a diagram of the routing of the belt and its direction of rotation so you can reinstall the belt the same way it came off -- and start the engine and let it idle only long enough to confirm the noise is absent or still present.
If absent then likely an accessory drive idler/tensioner roller bearing is bad (noisy and noisy is bad) or an accessory drive is bad. Most often in this case the water pump is the guilty accessory drive.
Check all for any excessive play. The water pump may not have lots of play but it can have -- at least in my experience -- a bit more play than the other drives which essentially had none.
Also, if the belt has a sharp edge this is a sign the belt is not tracking properly and this is due to an accessory drive with too much bearing/shaft play.
If the noise is still present with the belt removed then you need to install the belt and look elsewhere for the source of the noise.
If you suspect it is a transmission noise then it should be affected if the clutch pedal is fully up vs. fully down.
If pushing the clutch pedal all the way down and having it all the way up doesn't affect the noise then almost certainly it is coming from inside the engine.
If you suspect the noise is coming from inside the engine this is a pretty serious condition -- which may be addressable -- but the proper diagnosis and repair is probably beyond your capability.
In this case I advise you seek out a highly skilled/qualified tech (dealer or indy) and have him listen and make a diagnosis and advise you.
Thanks for the info. I did remove the belt and removed any whiny people from inside or around the car
and it was still just as whiny. It was the same regardless of clutch or gear position. I also had the AC off. I got it about a year ago and have put 10k miles on it. When I got it it whined a little (but I think they usually do) but now it seems much louder. Going to try to get it up on a rack soon to find the location of the sound. I'm wondering if it's this issue or is that even possible if it happens when the clutch is up or down?
https://rennlist.com/forums/996-foru...-or-whine.html
This is a source reference. Confirm exact model applicability in the original material.
