924Board.org

[benlg81]

Hi All

some of you may remeber my questions about weird noises from the back end of the car i now have a new one happening, it is the hardest thing to explain but ill try my best and if all else fails i will stick the camera in the back seat and record the sound as a movie.


Here we go:

When driving if i take my foot off the accelerator and let it coast ect it makes a noise like a rubbing then it goes off and on as the car gently judders.

The noise now does it when driving as well as iff i have an electric milk float (electric car or tram) whirling in the gearbox area.

(thats it imagine a milk float (electric car or tram) pulling away from your house!)

anyway not only this but some times if you leave it in 5th and start decelerating when you get to 40mph and below you occasionaly get a highpitch noise that continues till you either accelerate then change down or it will stay in time with the speed and high pitch scream all through the gears till you come to a stand still and then start again.

this noise also came on one going around a round about and lasted roughly 1/4 mile then disapeared.


sorry if this makes no sense but hopefully someone out there can figure out what im blabbering about and have an answer.

i am currently using new gear box oil ( 1 month old) 75w/90 fuch syntra

is there a additive to add to the box, am i using the wrong oil or is it something to do with cv,s? torque tube? drive shafts?

Cheers for all your help in advance

Ben

[benlg81]

also i haven't put my build thread on here but if you want to look it is here:

http://porsche924ownersclub.freeforums.org/my-924-finally-on-the-road-after-a-dark-horrible-winter-t2188.html

cheers

Ben

[fiat22turbo]

Could be your torque tube bearings. Park the car and put it in neutral with the clutch out and see if the noise changes.

Otherwise it could be bearings in the transmission starting to go bad.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[benlg81]

when not moving i dont get them noises reving or not reving

although in the past two weeks when i first start the car and back it out the garage there is a release bearing style noise that goes when i press the clutch and comes back when i release the cluth.

by the tim ei have got to work or get to the first set of traffic lights this noise has stopped.

[benlg81]

few details

it is a 5 speed box

been through the bits of history that came with the car and the only mention to the clutch was in august 1986 when the clutch cable was changed and the clutch release bearing shaft was lubricated, the put a note in to change the release bearing but i cant find any paper work after that.

after another drive to work today the noise (rubbing sound) is engine speed based

the release bearing sound at first start of the day only lasts about 1 min it sounds like it is a rattle in the middle of the car (just outside the drivers window) goes when clutch pressed starts again when clutch out.

is this cv?

[benlg81]

just driven home with the intention to listen and test this noise

the brushing/whiring noise happens when coasting in gear ect (clutch out) no acceraltor

under acceleration as well

if i press the clutch in or take out of gear fully then the noise goes away.

it is all based on engine speed

[benlg81]

dont know if this helps with the diagnosis but when i reverse it now makes more noise out the back end of the car whilst reversing (last week or so)

just thought i would chuck it in it it helps sort this out.

Cheers

Ben

[DOCO]

hi it sounds as if your discribing trans.brg. noise.does the noise change as you accelerate thorugh the gears?does the noise seem to go away in 4th gear?if you let off the gas still in gear does the noise change?you said that the noise is gone if you put it in neutral and just let the car glide along by it self engine running still?noises have to be one of the hardest things to diagnoise when you dont get to here them your self?let me know if the noise change as your up shifting,or are they constant always the same no mater what gear your in.we will figure this out!!!I hope!!
_________________
Doco "where am i going and why am i in this handbasket"author unknown
79 924 N/A "Webster"
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/______\
[+]___[+]
\0 924 0/
[__]..[__]
"WEBB STR"

[benlg81]

always the same sound through all gears and if i take my foot of the gas it kind of judder with the noise on and off until the car becomes smooth again.

[benlg81]

well i took the old man out for a drive to see if he could help with the noise and the rubbing noise not a problem just live with that but it did start the high pitch screaming again on deceralertion in 5th and also seamed to have a high pitch squeal thoughout the drive not a good sound.

the old man thinks it may be something with either the gear box or the torque tube as the clutch has no affect on the problem

[benlg81]

right another update (sorry if you guys are getting bored of this)

i have put the rear carpet back in and that has sorted the rubbing noise i was getting.

the high pitch squeel was about for a moment on monday on the way home after about 15 mins in traffic hot day and so on. it last for a few seconds then went away.

it appears to happen when it is hot outside and after a period in traffic. it also seams to happen on the same section of road (down hill decelerating, then round a round about that cambers to the leftthen as you go round it is up hill and then the straight off is a big hill)

Hopefully we can get to the bottom of this as i was really considering breaking this over the the last few days and selling as parts and buying a saab turbo instead

[Paul]

In regards to the screeching noise, it might be time to check your rear wheel bearings.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[joecitizennn]

A set of ear plugs will fix the problem entirely.

Now that we have solved that,

[benlg81]

[benlg81]