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#81
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#82
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Quote:
I had a new axle installed on the right front a little less than 2 years ago. 23,000 miles on it. My indy did it. Don't know brand. Left front I haven't done anything with as long as I've been driving it. About 97,000 miles. Truck has 256,000 miles on it. |
#83
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Than my official top suspect is the left CV axle.
Six balls per revolution your vibration is close to 3x tire rev I'm suspecting you are getting a harmonic. If a FFT shows a sound close to 6x RPM of the wheel it's very likely.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#84
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Update: went through my entire suspension system and checked torque on everything. Everything was to spec. The driver's side coilover preload was loose, so I went and re-preloaded the front coil overs. Checked my front drive shaft flex disk. It's almost new and looks to be in good shape. Checked the shaft to see if I could get it to move around side to side and it doesn't. I checked the movement on the front dif by rotating from resistance to resistance. It was about 9mm of slop. Anyone know what the lash spec is supposed to be? I couldn't find it. Also, anyone know what size allen wrench is needed for the fill and drain plugs?
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#85
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#86
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Another Update: I think I finally found my problem. Had things apart again yesterday to swap in control arms to see if I had a ply bushing failure. Discovered that the left front interior CV is shot. It allows excessive movement in and out. I can move the brake disc in and out about an inch! Put the wheel back on and, of course, movement at the tire is even worse. Checked it against the right front. Right front doesn't move. Makes sense. It's part of the drive line and the problem is worse under load and when turning. Ordered a new axle assembly. Will update after I get it installed. Fingers crossed.
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#87
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Something doesn't make sense. the cv joint has nothing to do with the brake disk/hub moving? That's all axle bearing and the nut holding it together.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#88
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I had shake and shudder on and off for over two years just random times. Changed the axle and bearing and all is well.
The inner joint is designed to telescope but not the outer joint however after seeing the inside of the inner joint it would be very easy to expect that to be the cause. More interesting in your case and you will like this: recall how i the outer joint had six balls so that worked out pretty well with the 3x wheel speed and would mean a harmonic? The inner joint has THREE wheels and would mean you should get 3x wheel speed for your vibration. I would say nearly 100% certain you found the source. There was a small error in perfection as I think there math worked to like 2.7-2.8x per tire revolution but I think I may have forgotten to subtract the 3mph from the speedometer. 2.8/0.96=2.917 that's even closer!
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#89
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Quote:
If it is the outer CV joint that is moving in and out, you can just buy a new CV joint and replace it and keep your original axle.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD Last edited by upallnight; 02-07-2021 at 02:38 PM. |
#90
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Quote:
I think he meant rotate? Clearly the brake rotor can't move left/right relative to the car axis when it's captive in the caliper etc. Anyhow, slop in the inner CV could very definitely be the cause of a drive train vibration that is worse under load and the coincidence of 3x wheel rotation is amazingly strong.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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