Front Drivetrain Noise: Video !

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Re: Front Drivetrain Noise: New find

Postby Corey » Tue Feb 21, 2012 6:44 pm

Tried the clutch while coasting - no change.

I'm booked into Audi tomorrow to see if they can figure it out . Toyota refuses to work on my car.

Hopefully it is a wheel bearing and not my tranny
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Re: Front Drivetrain Noise: New find

Postby tubasteve » Tue Feb 21, 2012 7:00 pm

I had the exact same issue, the wheel bearing was alowing sagging when the car warmed up(driven 4 a while), an the brakes were hitting the rotor due to the rotor no longer being centered between the brake pads. I took out a thermal temp gun, noticed one wheel was 140~ and the other sitting about 220*. The hub was toast, the bearing....well toast and rotor and pads. I got major brake fade is how I noticed, this was on my first alltrac that had been sitting for 7 years.
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Re: Front Drivetrain Noise: New find

Postby tubasteve » Tue Feb 21, 2012 7:03 pm

Corey Darling wrote:Tried the clutch while coasting - no change.

I'm booked into Audi tomorrow to see if they can figure it out . Toyota refuses to work on my car.

Hopefully it is a wheel bearing and not my tranny



Why do they not want to touch it?
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Re: Front Drivetrain Noise: New find

Postby Corey » Tue Feb 21, 2012 7:19 pm

Its RHD :roll:
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Re: Front Drivetrain Noise: New find

Postby gearhead313 » Tue Feb 21, 2012 7:51 pm

If it was a wheel bearing, then you'd be able to lift the car off the ground and feel play in the wheel as you wiggled it back and forth and up and down... have you verified that was all tight?


The only other thing im thinking is a motor mount is bad and letting the motor/trans touch somewhere making the vibe. Does anything clunk when you change gears up or down? When you reverse the car from a stop? Tough to internet diagnose something!
ST165 counter:
#2597 - fail
#3193 - fail
#xxxx - sold
#4598 - sold to Canada eh
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Re: Front Drivetrain Noise: New find

Postby Corey » Tue Feb 21, 2012 8:18 pm

I was thinking motor mounts aswell.

Wheel bearing feels good - no wheel play vertically and I've had a stethoscope on it while the car is airborn, no noise that I can hear.

I removed the left side tranny mount last night and inspected it - one tear on either side, but its not catastrophic and still appears intact.

But what does concern me are my solid poly front and rear mounts.

Inspecting the front mount, it appears that the vibrating engine has caused the through-bolt to rub and wear on the through-bolt holes, enlarging them in the up/down direction. I can actually see the hole above and below the flange of the bolt head.

I checked the torque on that bolt the other night, and it was good - but noise is still there. I haven't been able to check the rear yet because its tough to access, but I don't see the same kind of wear that I'm seeing in the front.

I'll snap a picture next chance I get.

I'm still trying to record some audio of this noise, but my phone can't seem to pick it up.
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Re: Front Drivetrain Noise: New find

Postby saved_1992 » Tue Feb 21, 2012 9:49 pm

how much movement is in the inner cv joints ? when you put grease in the one and added a metal clamp how much grease was still in there? iv seen inner cv joints make similair noises under load. with the car still having weight on the frt wheels see if the inner axles have play up and down. good luck
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Re: Front Drivetrain Noise: New find

Postby Corey » Tue Feb 21, 2012 10:03 pm

I've looked at the axles a few times this week and I think the play is coming from the axle stub in the transmission, and not the inner joint itself.

I can slide the stub in and out of the transmission by ~5mm, and from what I've read, this is fairly normal.

What I'm not sure of is how much play the stub should have in the radial direction. I can wiggle the stub up/down, forward and aft a couple mm.

I've read a few posts on many forums stating that lateral play is to be expected as well.


As for the inner joint itself - I can't seem to find any play with my hands. It may be a problem that I just cant get enough force on it by hand to tell.


I was only watching the tech add the extra grease to the boot, so I couldn't really tell how much was in there before hand. But if it was low, I'd imagine any damage already present wouldn't be fixed by adding more grease :(

Thanks everyone! keep em coming
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Re: Front Drivetrain Noise: New find

Postby tubasteve » Wed Feb 22, 2012 12:33 am

gearhead313 wrote:If it was a wheel bearing, then you'd be able to lift the car off the ground and feel play in the wheel as you wiggled it back and forth and up and down... have you verified that was all tight?


The only other thing im thinking is a motor mount is bad and letting the motor/trans touch somewhere making the vibe. Does anything clunk when you change gears up or down? When you reverse the car from a stop? Tough to internet diagnose something!



The play won't be there 100% of the time...but I tried.

PS, mine didn't have play, but had noise you speak of. Unless hot.
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Re: Front Drivetrain Noise: New find

Postby gearhead313 » Thu Feb 23, 2012 5:03 pm

So you can pull the transmisson output flange stub (that the axle bolts to) in and out of the trans 5mm? That sounds like a lot to me. That stub is secured with your standared issue wire c clip like any "half shaft" and shouldnt move more than 1-2mm IMO. I would pull that out and take a look at it if i were you.



And if you have poly mounts.....! Well im surprised your teeth are still in your mouth! hehe The amount of vibration transfer is quite a bit more than stock and I would guess thats part of the issue, especially if you say that the one may have been moving around on you. Sounds promising...
ST165 counter:
#2597 - fail
#3193 - fail
#xxxx - sold
#4598 - sold to Canada eh
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Re: Front Drivetrain Noise: New find

Postby Corey » Thu Feb 23, 2012 5:32 pm

Yeah I guess I've become used to the vibration - there is quite a lot though. Any little rattle in the interior is magnified.

I think I'll buy some new oem mounts.

Had to postpone Audi inspection till today. Will see what they say about the drivetrain.

Thanks
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Re: Front Drivetrain Noise: New find

Postby Corey » Thu Feb 23, 2012 10:45 pm

Well. Audi techs have found noise from front Right wheel bearing. Other 3 sound fine.

So they suggested that I start there.
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Re: Front Drivetrain Noise: New find

Postby Corey » Sat Feb 25, 2012 5:28 pm

Now having been made aware that I have a bad bearing - I can attribute it to a different noise I've noticed on the right side recently. It sounds like a dog box but only when cold.

But sadly, that means I don't think its the cause of THE noise because I can hear both at the same time.

Also, false alarm on the front motor mount bracket holes. I checked some pictures I snapped years ago when I installed the new poly mounts, and the holes are indeed not circular. So I think I can rule out the mounts, but just in case, I bought a cheap Lordco replacement mount for the front, I'll get that a try when I get a chance to see if it makes any difference.
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Re: Front Drivetrain Noise: New find

Postby Corey » Sun Feb 26, 2012 11:15 pm

Ordered new hubs, non-abs knuckles, non-abs front driveshafts, and bearing kits.

Will install in a week when I have some time off.

If all that doesn't fix it.....
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Re: Front Drivetrain Noise: New find

Postby gearhead313 » Mon Feb 27, 2012 11:35 am

o man, hope it fixes it!
ST165 counter:
#2597 - fail
#3193 - fail
#xxxx - sold
#4598 - sold to Canada eh
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