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Join Date: May 2004
Location: DC/NC
Posts: 812
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Thump from rear axle.
Hi all!
 My '87 Targa has developed a somewhat of a thumping noise coming from the rear at low speeds. When driving above 40-50 mph the thumping disapears. When driving at low speeds it's just a constant "thump, thump, thump". I can even feel slight vibration through the chassis. Before I get it up in the air this weekend, is there anything in particular I should look for? Thanks! Eli.
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911 |
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09-24-2004, 08:30 AM
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
Posts: 29,522
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Eli, I think you should get up in the air right away.
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Jim R. |
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09-24-2004, 08:34 AM
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Join Date: Feb 2004
Location: LaGrange, NY
Posts: 1,279
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maybe a bulge on the inside of the tire?
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Looking for 87-89 Silver Cab 911, black interior, must be low miles, near pristine, no accidents, well sorted. |
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09-24-2004, 08:35 AM
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Bring it to Tischer's tomorrow. We'll find it.
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2022 BMW 530i 2021 MB GLA250 2020 BMW R1250GS |
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09-24-2004, 08:35 AM
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Quote:
 . Drove the 912 today, probably won't have a chance to look until Sunday.My concern is that it's a CV joint at worst  , don't want to drive the car until I get it sorted out. Heard a lot of stories lately about axles breaking at speed throwing folks out of their cars, etc. With the top off and my sporadic use of the seatbelts, I can just see myself starting the next thread....
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911 |
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09-24-2004, 08:40 AM
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Join Date: Nov 2003
Location: Kingsport, TN
Posts: 990
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It's the CV boot disintegrating and hitting against the heat exchanger in the case of the inner boot, or the trailing arm in the case of the outer. Jack the car up and rip the torn rubber off.
JCM
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Stuff of marginal consequence: - 1974 911"Carerra" sunroof coupe |
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09-24-2004, 08:43 AM
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Not Quite Banned
Join Date: Dec 1999
Location: Ft. Lauderdale
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CV joint, or loose cv bolts.
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Thomas Owen 1972 911T 1972 911S |
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09-24-2004, 08:44 AM
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Location: DC/NC
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Thanks guys. I'll tare into it on Sunday. hoping for the loose bolts...
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911 |
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09-24-2004, 10:20 AM
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Ok,
I had the car up and checked all CV boots. All are intact and looked almost new. I went through the records and sure enough CV boots were replaced at the same time a clutch job was performed about 20K miles back. Drove the car some more, the noise can only be heard when going in second gear about 20 MPH, it's distinctive whirring coming from the drive train. Almost sounds like a bad wheel bearing, except the wheel bearing noise ususally doesn't go away.... Any ideas? Anyone local willing to lend an ear? 
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911 |
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09-26-2004, 05:16 PM
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DP935 member
Join Date: Sep 2004
Location: Kentucky
Posts: 3,044
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One good way to check a bearing that you think is failing is to drive on a curvy road that is close to home and make some zig zag type turns and you may hear if it is a bad bearing. When turning left the weight would be on the right side and when turning right the weight would be on the left. This is just a simple way to test it yourself first. A parking lot is good for this type of test also. Hope this helps some.
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Porsche Slantnose M505 M506 group on Facebook. https://www.facebook.com/groups/719995181372494/ |
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09-26-2004, 06:26 PM
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Only Porsche
Only bike
