Vibrations in rear solved!!!!

370ztime

Ok so if you look at my recent posts I was having a vibration in my rearend around 70 and up that would come and go on acceleration and hum at 70 and up....dealer said normal but replaced my driveshaft due to grease sling. Car still vibrated!!!!so I decided to dig into it after everyone said normal. I drove two other z cars this last weekend that had like a vibrational tire noise in rear on the road at 45mph so i thought it was normal for our cars to make that low frequency noise. Both cars had about 20-30k on the odometer. Ended up my car was fixed today by torqueing the cv axle nuts in the rear. Apparently there are threads about this due to a clicking but one of mine was loose and had backed off about a full turn on the threads. From what I can figure, the cv axle on the driver side is most probable to do this due to the rotation being opposite the passenger side. After I torqued the nut down and buttoned up the wheels. Went for a drive....no drone vibration at 45 mph in hatch or at 70-80 silky smooth like a lexus.....I am just letting everyone know due to the fact that the cotter key is drilled about 3-5 threads back from the nut shoulder and allows for nut to back off some. The only fix I see that nissan did from earlier years is smeared rtv silicone over the end of the nut and threads which obviously does not work.. Hope this helps someone like me!!!! Id check them if you own one even if no vibe...

37Z

What did you torque the CV axle nuts to? Is the CV axle prone to loosen the inner or outer ones?

gy954

Do you think putting red loctite on when you torque the bolts would help prevent a recurrence?

370ztime

I think the torque spec is 177 ft lbs...i torqued mine to about that maybe 180 or so. I would use blue loctite because you cant get red off unless you heat to like 400 degrees....I think blue works great......if your axles click you know it is getting loose mine was a previous owned car so it had already passed the clicking point....you are suppose to grease the axles too....heres a link that will answer anyones questions on the clicking....but the vibration noise is past the just barely loose point to where it actually wiggles in the hub. Also to answer your question...its the outer nut at the center of the hub.....

Clicking Noise from Rear Axle, - Page 3 - MY350Z.COM Forums

juld0zer

i posted it on another page but i'll put it here too:

Torque setting depends on the model.
Models with the adjusting cap (large beer cap looking thing over the axle nut) only requires 100Nm/77ft lb max.

Based on the FSM, only the 2009 and some 2010 models do NOT have the adjusting cap. In those models, torque it up to 133-136 ft lb.

177ft lb i believe is for the 350Z.

Don't overtighten or wheel bearing damage might result.

DIGItonium

I dealt with annoying clunking noise in the rear which was also fixed after finding out the axle bolts were loose.

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juld0zer

you mean the 32mm nut, right?