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Intermittent knocking when clutch engaged
I have an intermittent knocking sound, seems to be coming from the right front, that is heard when clutch engaged/under power, but not when in neutral or clutch pushed in. Kind of a rhythmic thumping sound that's speed dependent. Seems to be worse when making sharp turns, like up a twisty hill. Shifts fine, usually heard 1st-3rd gears, then either quiets down or gets drowned out. I've checked front wheel bearing and bellcrank bushing so far, and both seem ok. Next to check will be suspension. Sorry I haven't made video. Anything else come to mind I should check?
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06-18-2020, 05:36 AM
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hi, I think you better stop driving..look 1st on your axles attachment to the trans.and to the wheel hubs, for that you need to put the car in the air-safely-take some pictures and let us see it.
Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-18-2020, 10:53 AM
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06-18-2020, 02:08 PM
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06-18-2020, 02:29 PM
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Former Options Trader !!!
Join Date: Feb 2003
Location: Bucks County PA
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Clutch is just about cooked.
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Current:88 Guards Red Coupe, 89 Coupe Track Rat, 76 Caddy Eldo Convert. 2015 Aprilia Tuono Wrecked 1987 Targa Guards Red, 2003 Ducati ST4S Sold 1987 Granite Green Targa, 993's, 93 RSA, other 964 coupes, 89 911 Turbo Ruf mods, 90 e30 M3, 07 BMW R1200S STOLEN 94 Speedster |
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06-18-2020, 02:51 PM
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06-19-2020, 03:14 AM
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Video from two days ago. I don’t think it’s clutch. No slipping, strong on accelerations. Famous last words I know...
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06-19-2020, 03:18 AM
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Join Date: Mar 2001
Location: Marysville Wa.
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CV joints do that when they're low on lube/worn out. When was the last time they were serviced? From the looks of them, never. 9 out of 10, they are too worn to reuse when you get them all disassembled and clean enough to properly inspect, so usually a pair of new Lobro axle assemblies are in the cards.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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06-19-2020, 07:46 AM
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did you try to touch the axle could be the bearing cage broken.. if there is a play on the shaft when you try to twist them....did not see J.W.re..
Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. Last edited by proporsche; 06-19-2020 at 08:21 AM.. |
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06-19-2020, 08:12 AM
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No play when I just twisted the shafts.
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06-19-2020, 10:54 AM
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ok..did you try to rotate the each wheel while the car in the air..
Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-19-2020, 11:01 AM
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another question..have you done some work prior theis noise ..or when this started??
Also does your hand brake works? Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-19-2020, 11:23 AM
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The CV sound is like a horse on concrete. clop, clop, clop. No play means nothing.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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06-19-2020, 12:02 PM
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John is right about the horse;-) plus it is a metal sound which point to the bearing cage --
Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-19-2020, 12:22 PM
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I guess I did something wrong about posting the video, but the clop clop nails the sound!
It’s very intermittent. Bit the bullet and drove it yesterday with a friend to try and reproduce for someone to record sound from passenger seat. Of course it didn’t happen... The rear axle joints were repacked and boots replaced last January, about 4000 miles driven since give or take. I heard sound in traffic before this Im sure. So axles themselves are the problem then? I’m grateful for the help y’all have given. |
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06-19-2020, 12:43 PM
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And yes hand brake works fine.
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06-19-2020, 12:44 PM
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ok, the sound comes and goes, correct? Since you did 4k miles are you saying you have heard the sound for a long time or just recently?
One more q.. what speed about were you traveling...so i can sleep on it;-) Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-19-2020, 01:01 PM
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Yes comes and goes. Yes I heard it in the fall of 2018, briefly. I can only hear it at lower speeds like 30 or less. Never on highway, etc.. Were you able to see/hear the video?
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06-19-2020, 01:11 PM
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yes i did see the video;-)
Ivan
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1985 911 with original 501 761 miles...807 506 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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06-19-2020, 01:23 PM
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Good! Just wanted to be sure it got posted correctly
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06-19-2020, 01:58 PM
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Green Car
Traum
