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Location:
Ipswich
Registered:
May 2002
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Diff whine
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Mon, 11 October 2004 04:45
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I just got a locked T-series center as an interim while I save up for a proper LSD, and it's rather loud - like a whirring loud... It's okay up to about 30k's, at 60 I can't hear my engine or exhaust anymore, and at 100 I can't hear myself even if I shout...
I'm guessing this means the diff is rather stuffed. It doesn't really sound like crunchy bearings, it's more like a 747 sort of whine... Oh yeah, and only on acceleration. On coast it's relatively quiet... I've been told that locked diffs whine, but surely they aren't meant to make this much noise?
What will happen if I keep driving on it? Will it just wear out really quickly? Or will it self destruct and blow everything to bits?
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Location:
Perth
Registered:
July 2004
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Re: Diff whine
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Mon, 11 October 2004 05:05
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where did you get it from? 2nd hand or shop?
Did you change the crown from the previous center onto it or use a new one?
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:10
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It's 2nd hand.
And no, nothing's been replaced on it. Just pulled from the old housing, welded up and put into the new housing...
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:20
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I've been told that bearings tend to make a more crunchy sound though, not a whining sound? And besides, if it was bearings wouldn't it make noises all the time, whether on acceleration or deceleration?
I don't know much about diffs...
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Location:
Brisbane
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:22
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Most likely pinion pre-load. A diff shop will be able to tell you straight away.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Diff whine
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Mon, 11 October 2004 05:23
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It will probably be that the pinion isnt meshing with the crown wheel properly.
Very common, live with it or replace it.
Maybe try and put some additives into the oil to reduce the sound. (like banana skins or graphite powder)
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:29
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Very common, live with it or replace it.
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If I choose the "live with it" option (due to lack of funds, and the fact that it probably won't be in the car for more than a few months - and that's only with some weekend driving), is it likely to blow up or do anything severe like that?
I suppose my main concern is driving out to Willowbank this weekend and have it detonate on me halfway there, or halfway back...
I can live with the noise (hoorah for ear plugs), and I can live with accelerated wear since it won't be in the car for long, but if it blows up and sends the car spearing off into the scenery or something tragic like that, then no, I can't live with that...
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Diff whine
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Mon, 11 October 2004 05:33
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I can't see meshing problems causing a diff lockup.
But then again, I'm no diff expert.
If it was my car, and I had a planned swap in a few months, I'd leave it, and get a louder stereo in the meantime
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Location:
Brisbane
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:39
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Incorrect pinion pre-load definitely will result in accelerated wear. Exactly how long it will last is anyone's guess though.
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:40
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Well, I've already signed up for an LSD, it just depends on when one comes up for sale. I'm hopeful a few months is as long as it takes...
No stereo in car (club car), and besides I can't even hear myself shouting over the whine of the diff... It's even louder than my angle grinder, and I get many many stares from people as they drive past me on the freeway...
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 05:43
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Exactly how long it will last is anyone's guess though.
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That's fair enough, I just hope it lasts long enough...
Oh well I guess I might leave it in the car for now, just going to change the diff oil before the weekend and try to fix the slight bearing end float that I've got and hopefully the car will survive the weekend... Unless there's a lot of metal bits in the oil, then I'll have to look to borrow or buy another center for the weekend...
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Location:
Perth
Registered:
July 2004
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Re: Diff whine
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Mon, 11 October 2004 06:33
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when you get your new lsd you will have to get it done properly. dont be dodgy because you can only put up with that sound for so long. you will need new pinion gear and bearings so it would pretty much be a whole diff rebuild. get tighter springs if it is clutch type, 280 i think is the go?
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Location:
Ipswich
Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 12:50
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Did you weld the diff while it was all still assembled? They don't always like this!
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 13:11
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Umm, I'm not sure, it wasn't welded by me. I have been assured, however, that it was kept cool while it was being welded (to prevent it from warping etc)
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 13:44
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crownwheel/ring & pinion contact patch.
it does make more noise with light/cruising throttle then full throttle & heavy load, doesn't it?
the pinion bearing pre-load can be perfect, but it is its position to mesh with the ring gear that is much more important and will make it whine when mis-aligned.
no oil or additive will change it unless it has been empty, and that won't save its life by much.
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Location:
Ipswich
Registered:
May 2002
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Re: Diff whine
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Mon, 11 October 2004 14:06
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allencr: it makes a "rougher" noise under light/cruising throttle, but I don't know if it is louder than full throttle & heavy load. It's all pretty loud to me 
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