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#12
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Front Bearing Removal Tool
15.068*3=45.204. That is very likely the spike over to the right. Getting a distinct vibration at 3x wheel RPM, something is vibrating close to that harmonic.
39*7.3/3=94.9 feet/sec. 65 mph should make the wheel RPM 1/3 of that harmonic see if the shake dials in at that speed. It's possible the shake is just more annoying to you at 75 because higher amplitude etc. If the spikes align at an exact multiple of tire rotation it's definitely tire/wheel related. I would change the prime suspect with spare and move that around. You might have thrown a wheel weight or have an internal belt delamination issue (that happened on my Z28. A little shake finds its way into the un sprung suspension and bingo: harmonic
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) Last edited by andrewwynn; 12-14-2020 at 12:09 PM. |
#13
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#14
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Much easier than a front bearing. I have to earn those dhc parts somehow (2 in use already. Both needed "the fix" and you timed replacing them great they were all broken they just hadn't broken in half yet.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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#16
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Update:
got the truck in to have the wheels rebalanced. As suspected 2 of them had thrown weights. One in front and one in rear. Now the vibration is WORSE. Especially under load like going up a grade. Next move will be pulling wheels and checking everything on the suspension for tightness and damage. Then I'll swap the spare on one wheel at a time and see if that has any effect. If not, my next try will be to dial the firmness on the coilovers back up to the mid-point of their range and see if that has any effect. This vibration is only really noticeable once at 60 mph and above. Waiting for the weather to cooperate. |
#17
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Front Bearing Removal Tool
I have a problem with an out of round tire. Balance won't fix. The spare swap may be your fastest find also use vibration app to locate corner. Very helpful if you have somebody else drive.
Load up a grade suggests problem in the drive train like guibo or rear diff mounts.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#18
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#19
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I use a front wheel bearing kit with a Harbor Freight's hydraulic pump and head to remove and install press in wheel bearings.
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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 |
#20
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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 |
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