Mark Stahl

Over the past few weeks I've noticed a roaring noise emanating from (I think) the left rear of my '86. It's been gradual but is now pretty loud. It seems to go away when turning left and get a bit worse when turning right. A rear seat passenger noticed a bit of a vibration there as well (which I know is a new thing.) Tires look good and are at proper pressures. A change of differential/transmission oil had no effect. That's a bad wheel bearing, right? Anything else it could be? I saw the nichols site has some instructions on changing them out. Any other advice/stuff I should know? Should I do both rears?

Thanks!
-Mark
'86 928, 5sp.
Ott X-over

mark kibort

probably just one side is bad, and you can check by the way I did. jack the car up, stands, and then put it in gearand get the car in 5th , 4-5000rpm and listen to the bottom of the shock with a stethascope. the louder one or one that is howling, needs to be replaced

MK

AO

Didn't Chuck Z recently have this problem? Turned out to be his U-joint/drive shaft. I'll see if I can find it.

rixter

I'm having my wheel bearing replaced today, to test I put it up, took off the wheel and put it in gear and gave it a good deal of rpms.. could hear it growling big time with tire off
half shaft is another possibility but that's generally more of a clunking sound

AO

Found it. Read Post # 51 for a test to see what you have.

https://rennlist.com/forums/showthre...5&page=1&pp=40

One other possibility is the service brake. I'd take the caliper and rotor off and spin the hub to see if the noise is still there. Good luck.

Jim bailey - 928 International

The change in tonewwhen turning right /left as it loads and unloads the wheel is a good indication of wheel bearing.

Mark Stahl

Thanks, guys. I just read the "clicking noise from left rear wheel" thread that Andrew linked to-- very helpful! My noise is much more of a low-pitched "roar" that changes with turning (as opposed to a CV-joint "clicking"), which I was always taught was fairly diagnostic of a wheel bearing. I'll get a look at it and let you know what I find.

Anyone know someone near the Bronx (NYC) who can press in a new bearing? I'm fairly sure I can get everything apart (322ft-lb you say??) but I obviously can't do that part.

UKKid35

Undoing the hub nut is just a matter of brute force, removing the lower suspension bolt can be a real PITA. One side took me 8 hours, the other only 90 minutes. Separating the hub from the hub carrier was beyond me, I just took the whole assembly plus a new bearing to a workshop. A press makes it all much easier.