Edited by Haight, 12 April 2014 - 04:35 PM.
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Help! Loud ringing from driveshaft/transmission
Posted 12 April 2014 - 04:32 PM
Posted 12 April 2014 - 05:28 PM
It's crazy how the world works; or our cars are on a specific schedule to do things at certain times. My 5 speed d/r just started doing the EXACT same thing. Just like how you describe. I haven't investigated it further. What I can say is that I recently put a new axle in the rear after going a year missing one. For this reason I thought it was maybe the spider gears in the rear diff being worn from so many miles with only one axle on the back wheels, but that's just speculation. I have no idea what it is. My car is in rough shape right now.
Does yours continue to emit the noise even after placing it in neutral and rolling?
Posted 12 April 2014 - 10:03 PM
Edited by TallonX, 12 April 2014 - 10:06 PM.
Posted 12 April 2014 - 10:19 PM
No idea on the u joints.
And no, the exhaust has nothing to do with it.just completely redid the whole exhaust today. Problem is still there.
Posted 12 April 2014 - 10:34 PM
Check for sloppiness in the u-joints, especially if you are still running your original driveline. The bearings on the factory installed drive shaft are staked in, if
the u-joints have ever been replaced odds are there will be cir-clips visible that lock the bearing caps in.
Posted 13 April 2014 - 01:19 AM
Posted 13 April 2014 - 07:24 AM
How do I check? (The driveshaft)
grab near a joint, one hand on the shaft each side of where the u-joints are, and try moving the joint around. If you get side to side play bearings are probably shot, but keep in mind a small amount of up-down (in relation to the direction the needle bearing sit in the caps) is normal.
Also, check the support bearing at the middle of the drive shaft. If it's bad or the rubber surround is rotted, it could cause some noises.
This article is pretty straight forward on drive shaft checks:
Edited by SmashedGlass, 13 April 2014 - 07:25 AM.
Posted 13 April 2014 - 07:56 AM
cue Twilight Zone theme music ...
Only just twigged the other day what the ring ting, ting noise is in my EA82 5MT. It is different to really dry and embedded roller needles in an EA81 one piece tail shaft, but that is what its gotta be in mine. had it for ages and thought it was something in the box itself - shifter rails tinkling against each other - then it dawned on me - the short front half of the two piece would have a different tone due to its shortness.
Thought it could be a little end bush but noise is there at road speed and does not correspond to engine revs.
Not a job I wanna do - staked uni's
Posted 13 April 2014 - 08:01 AM
I took mine to a drive shaft shop, with new joints that I purchased. They charged me something like $40 to press out the staked in factory joints, install the new with the circlips, lube, and even balanced it. Well worth it if you don't have access to a press.
Posted 14 April 2014 - 04:41 AM
dry looking rusty red browny apearance about the unijoints ? I have found EA81 unijoints not actually have any play - so no vibration, no shake in the rear view mirror but the needle rollers in the uni joints were so dry that they wore themselve ridges into the inner 'pin' of the uni joint.
Posted 14 April 2014 - 10:37 AM
Posted 14 April 2014 - 11:40 AM
Posted 14 April 2014 - 11:49 PM
Does the sound go away with clutch engagement/disengagement? I had a T5 do the same thing when the rear mainshaft bearing was failing. Would go away when the mainshaft stopped spinning (clutch disengaged/pedal in).
Also check for trans-mount play. It could just be resonating the engine/drivetrain vibrations at certain RPMs due to tired mounts.. or there could actually be something inside the driveshaft!
Posted 14 April 2014 - 11:57 PM
I'm positive. I had the car on a hoist and was under it when a friend revved the car. The exhaust doesn't touch. I'm positive that the sound is coming from inside the driveshaft. When I grab it with both hands the sound goes away. It is like the sound is resonating throughout the metal.
That's not enough to tell as the car isn't under load.
The suspension moves & the engine will twist more when it loaded up.
Is the hoist the type that picks up under the body, or you've driven on it & it lifts by the tyres?
Get the car back on the hoist, grab various parts of the exhaust (while cold & with the engine off), and shake it as violently as you can, it shouldn't hit anything.
Posted 15 April 2014 - 02:08 PM
Posted 16 April 2014 - 11:07 AM
Sounds like the pilot bearing is shot.
Same symptoms that my brother was having on his Chevy ZR2. No mechanic in Seattle area could diagnose the problem correctly. They all said the transmission was going out.
Posted 16 April 2014 - 01:30 PM
Mine did the same... That's how I figured it was the exhaust, enaginging 4wd balances the torque flex of the drive train
Update. The sound goes away when I engage 4wd.
All of your mounts good? Motor mounts, trans mount, that dog bone anti-pitch thing...
Edited by TallonX, 16 April 2014 - 01:35 PM.
Posted 16 April 2014 - 04:47 PM
I was gonna say, diagnosing a subaru shot uni is different from most other makes due to the PT FWD where the tail shaft to drive rear wheels is just along for the ride most of the time so is not transfering power, so no load to cause vibes etc, and things may change by engaging rears into play.
Oh, and in my EA82 Y pipe it has that double walled piping/tubing...something has deteriorated internally and makes a bloody awful rackt on acceleration sometimes, other times quiet as. Embarassing but free $
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