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  #11  
Old 12-14-2020, 11:27 AM
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Quote:
Originally Posted by andrewwynn View Post
It's all connected. 2.6 x RPM of wheel is strange though did you have another frequency spike that was faster or slower just not as tall?
This is the result of the scan: https://www.mecanocaucho.com/en-GB/c...urement/16269/
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  #12  
Old 12-14-2020, 11:53 AM
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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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Last edited by andrewwynn; 12-14-2020 at 12:09 PM.
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  #13  
Old 12-14-2020, 12:55 PM
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Quote:
Originally Posted by andrewwynn View Post
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
I just looked and it looks like I've thrown a wheel weight. Good call! It's off to the tire shop I go for a rebalance. Thanks Andrew! Let's hope that's it.
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  #14  
Old 12-14-2020, 05:30 PM
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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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  #15  
Old 12-14-2020, 05:52 PM
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Originally Posted by andrewwynn View Post
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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  #16  
Old 12-26-2020, 02:47 PM
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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.
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  #17  
Old 12-26-2020, 02:49 PM
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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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  #18  
Old 12-26-2020, 10:54 PM
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Quote:
Originally Posted by andrewwynn View Post
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.
Thanks for the suggestions. I've been taking vibration measurements. Plan on doing them again tomorrow. Looks like the weather will cooperate. I'll put the spare on and move it around. Drive train occurred to me as a possibility as well. The rear diff mounts are fairly new and are poly. The front guibo was replaced at approximately the same time frame. The drive line is original. Original guilbo, center bearing and CV. Car has 257,000 miles. The reason the driveline occurred to me is that about six weeks ago I discovered a broken rear diff bolt which had allowed the diff to sag. I'm thinking it could have caused damage to the center bearing or the rear CV. Any ideas on troubleshooting methods for those two bearings?
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  #19  
Old 12-27-2020, 01:17 PM
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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
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  #20  
Old 12-27-2020, 01:18 PM
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Here's a video on the setup.

https://www.youtube.com/watch?v=m3dgrgmMZw0
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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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