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curtisr
 
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Join Date: Dec 2011
Location: Kingston, Ontario, Canada
Posts: 1,059
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Clunking sound from the rear end area

The other day I noticed a clunking sound coming from the rear of the car. After determining the whereabouts of the kids and dog, I continued out of the driveway. It was then I noticed that the brake warning light on the consul was on. At first I thought it might be a dislodged e-brake shoe but taking the rotors off ruled that out. The e-brake also appears to be working properly.

The sound comes and goes with speed, coasting, and in neutral.

Here's a video of my turning the half-axle. The car is in neutral (manual transmission). It's only 15 seconds long and not knowing how to insert it, I've used a shareable link from my Google Drive.

Any suggestions would be most appreciated. (And, yes, I know it sounds like 'Chain Gang'...)

https://drive.google.com/open?id=1t17YZnCXlmoRHxoeKpcmU33XB7iUedbb
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1977 924 Guards Red (parted and sold)
1987 924s Alpine White (sold)
1987 924s Kopenhagen Blue (a work in progress and on course to become my track car)
1987 924s Garnet Red
1982 928 Silver (sold)
Old 09-05-2018, 01:45 PM
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944 addict
 
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Pull the rubber inspection plug and see if the drive shaft coupling is loose or broken. Verify that all of the bolts on the CV couplings (both sides) are intact. Pull the parking brake slightly on just to create some drag and see if that affects the sound. Hold the CV coupling in your hands and turn the shaft to see if you can "feel" the clunk to locate the area of the noise. Good luck with this.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.

Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
Old 09-06-2018, 06:58 AM
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curtisr
 
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Join Date: Dec 2011
Location: Kingston, Ontario, Canada
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Quote:
Originally Posted by mytrplseven View Post
Pull the rubber inspection plug and see if the drive shaft coupling is loose or broken. Verify that all of the bolts on the CV couplings (both sides) are intact. Pull the parking brake slightly on just to create some drag and see if that affects the sound. Hold the CV coupling in your hands and turn the shaft to see if you can "feel" the clunk to locate the area of the noise. Good luck with this.
Finally got to this! Here's my report:
  • Viewing ports opened. (It's strangely clean and like new in there...)
  • CV joint bolts all good.
  • E-brake pads all good.
  • Shaft coupling appear to be clamping tight.

It's really difficult to isolate the sound! Wondering if it isn't a torque tube bearing issue. I'm going to try to have a look with a camera.

Thanks mytrpseven!
__________________
1977 924 Guards Red (parted and sold)
1987 924s Alpine White (sold)
1987 924s Kopenhagen Blue (a work in progress and on course to become my track car)
1987 924s Garnet Red
1982 928 Silver (sold)
Old 09-07-2018, 03:42 PM
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curtisr
 
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Join Date: Dec 2011
Location: Kingston, Ontario, Canada
Posts: 1,059
Garage
I couldn't really see anything with the camera. I can rotate the driveshaft perhaps an 1/8th of a turn freely and then it stops. Not sure what to do next.
__________________
1977 924 Guards Red (parted and sold)
1987 924s Alpine White (sold)
1987 924s Kopenhagen Blue (a work in progress and on course to become my track car)
1987 924s Garnet Red
1982 928 Silver (sold)
Old 09-10-2018, 07:53 AM
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Join Date: May 2018
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In listening to the sound on your video, at the end you can hear a metallic ringing sound, like something hitting a piece of tempered sheet metal. A similar sound is sometimes made when you hit the sheet metal splash guards/backing plates protecting the brake rotors. Can you rotate each wheel and check for interference or contact by anything with these brake shields?

Last edited by Spring44; 09-10-2018 at 12:24 PM..
Old 09-10-2018, 12:19 PM
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