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strange howl from rear in 4th and 3rd
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tim3
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PostPosted: Thu Apr 03, 2014 6:13 pm    Post subject: strange howl from rear in 4th and 3rd Reply with quote

Im getting a weird howl noise from the rear in the car just as I come out of thitd and into 4th but it goes away once I reach 3k rpms..

I know main shaft bearings should make noise the whole time right? I did tighten up my axle nuts on both sides as they were loose. I started hearing this noise after I tightened them. I tightened them to 200lbs so the axle bearings should be fine.. I want to loosen up thr axle bearings but idk? Any ideas .. its a 66 squareback[/i]
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vlad01
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PostPosted: Thu Apr 03, 2014 6:16 pm    Post subject: Reply with quote

can you record the sound and post it?
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PostPosted: Thu Apr 03, 2014 6:17 pm    Post subject: Reply with quote

Ok will do!
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tim3
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PostPosted: Fri Apr 04, 2014 9:18 am    Post subject: Reply with quote

Cant get an accurate recording but I can also heae creaking like a squeaky bed when I roll up to stop signs on the rear passenger side. I just checked to see if the axle nut was too tight and it was actually possible to untighten it by hand. Not sure wth is going on..
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PostPosted: Fri Apr 04, 2014 9:21 am    Post subject: Reply with quote

Stripped drum splines?
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PostPosted: Fri Apr 04, 2014 10:13 am    Post subject: Reply with quote

or a crack in the drum. I had a friend with a squeeky right rear drum. Took me walking next to it while he was coasting to figure out what it was
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PostPosted: Fri Apr 04, 2014 10:23 am    Post subject: Reply with quote

Erik G wrote:
or a crack in the drum. I had a friend with a squeeky right rear drum. Took me walking next to it while he was coasting to figure out what it was


Yeah, but he's got discs on the rear. Shocked Might be a cracked hub though. Or maybe a stripped nut, since it won't hold torque.
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tim3
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PostPosted: Fri Apr 04, 2014 12:05 pm    Post subject: Reply with quote

yeah I tightened it back up and it stopped squeaking all together after I took it on the freeway for 10 mins.. the howling also is not as loud now.. I am so confused.. i've stripped a drum before on my notchback years ago and I could say it might sound similar but not really.. I do have rear discs now so this whole sound is something I never really heard before.. when I rotate the disc on the rear passenger side it rubs the pads like a bent bike wheel.. so drags on about 50% of the rotor then stops dragging.. Feels unbalanced.. really strange stuff..
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PostPosted: Fri Apr 04, 2014 12:11 pm    Post subject: Reply with quote

Have you changed out that single circuit master yet?
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tim3
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PostPosted: Fri Apr 04, 2014 1:36 pm    Post subject: Reply with quote

nope haven't changed the single circuit yet..
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PostPosted: Fri Apr 04, 2014 2:55 pm    Post subject: Reply with quote

if your hub came loose, the bearing maybe be damaged now. worth having a look

come to think of it, when I was in my teens my 1st type 3 had a squeak and deep whining sound at the rear. the bearing spacers and inner race were smashed despite the hub being tight. I installed new (2nd) bearings and spacers and it was good as gold after.

Also with your disk rubbing only 50% of the way round, something is horrifically wrong there. Should not be any more than 0.05mm runout over the whole disk. Time to disassemble and start checking for bent parts, worn parts or out of tolerance etc...
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tim3
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PostPosted: Sat Apr 05, 2014 9:18 pm    Post subject: Reply with quote

so it appears to be a spun rear rotor on the driver side.. i took the rotors off on both sides and the driver side is worn down to little razor blades for splines.. the passenger side is in perfect condition.. looks like i will be replacing that rotor and making sure it can be torqued to spec by keeping an eye on it.

on a positive note i finally raised my back end and evened out the ride height with inner and outer splines.. since I wont be driving her till i replace the rotor i felt i might as well dial in the stance perfectly..

once i replace the rotor and torque it down properly I'll update this thread and see if it fixed the howling noise.. I am also going to see if my tranny fluid it low as i suspect it hasn't been filled or flushed in many many years...
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