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Growling back end!

tony986

tony986

PCGB Member
Member
Anybody help? I have recently acquired a fairly tidy 944S2 1991 90K miles. It has a 'growling' noise from the back end, sounds like a bearing of some sort.....does it in and out of gear but goes when clutch depressed. Any other car I would say thrust bearing, but never had a car with torque tube or indeed transaxle before so throwing it out to experts and enthusiastic amateurs alike. Also looking for recommended Porsche 944 specialist in North west to carry out jobs beyond my fumbling skills (wife can't be doing with the bad language any more!).
 
I can usually introduce a growling from the back end depending on what the order was from the Indian the previous night !
seriously though it could be a thrust bearing, the clutch set up is the same as most regular cars but the clutch is at the bell housing and not the back end,myopic have a rubber damper plate in the back which perishes and brakes down, could be the problem.


 
You don't say if you hear a noise with clutch in or out when you are stopped. Based on your description it would seem you only get it while moving.
I will say that the driveshaft/torque tube design of our 944s are great at telegraphing noise so the source of the noise is not always where you think it is. I'm interested in what you find as I now have a noise when idling at a stop goes away when I depress the clutch fully. I'm sure the noise is there while driving also - I just can't hear it over ambient engine/road noise.

I have a new clutch/pp/guide tube from last year - about 4k kilometers. These were replaced due to a bad release bearing which was noisy and hanging up on the guide tube making operation difficult. Turns out the clutch was nearly new but whoever changed it previously filled the bearing with some kind of grease that had virtually solidified restricting the bearing from fully releasing or from freely moving up and down the guide tube. Another reason to have your Porsche serviced by marque specialists.

 
Don't get me started on toxic emmissions, technically I am banned by Kyoto . Makes noise in gear and out, goes when clutch depressed,looks like I'll have to get oily. Keep you posted. T
 
Maybe gearbox then? - mine is quite noisy (but not rumbly) at idle, but you can't hear it when you get going.

What sound to bad TT bearings make? Do they rumble?
 
bmnelsc said:
I have a new clutch/pp/guide tube from last year - about 4k kilometers. These were replaced due to a bad release bearing which was noisy and hanging up on the guide tube making operation difficult. Turns out the clutch was nearly new but whoever changed it previously filled the bearing with some kind of grease that had virtually solidified restricting the bearing from fully releasing or from freely moving up and down the guide tube. Another reason to have your Porsche serviced by marque specialists.
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Something else that isn't usually picked up by those not in the know is the clutch fork, the two prongs wear over time or even crack in extreme cases. I would say that all 944's today have worn prongs of some description and if renewing a clutch , check the fork. If it's worn get some weld on the tips and grind to shape, if this isn't done the clutch release bearing is very likely to not be operating properly.

Pete
 
Nice tip that Pete S my S2 has definitely got some thrust bearing noise, goes away with some clutch pressure
 
My transmission needs looking at - not sure whether its the tt bearings the diff the gearbox or the clutch......... or whether its just general wear and tear throughout (156000 miles - clutch replaced at 100000 miles). Anything less than smooth and gentle downshifts will cause severe juddering and vibration which seems to come from the back end of the car rather than the front. The clutch doesn't slip although the gear lever is a little stiff and the clutch bites when the pedal is about half way down. There is no transmission whine when travelling along and the only noise I can hear is ......... a light abrasive swishing chatter is probably the best way I could describe it. With the car stationary and the engine ticking over the sound is audible from within. My identical /similar mileage track car doesn't make the same sound and is a much better car to drive transmission wise. As these are the only two 944's I have ever driven I don't really have anything to compare them against.
 
Nice tip that Pete S my S2 has definitely got some thrust bearing noise, goes away with some clutch pressure
Click to expand...


They all have, just depends how much you can hear it.
 
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