Mud-club

Vehicle & Technical => Discovery => Topic started by: Leigh on February 22, 2006, 20:40:23

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 20:40:23

I can't work out where its coming from, but when I accelorate I can here a whining noise. Some times its worse than others but then it can just disappear.

Any ideas? And could this be something serious? After a blown head just before christmas and an mot bill costing £860 I really hope it isn't  :?

Cheers

Title: Whats that whining?
Post by: Colin 009 on February 22, 2006, 21:07:02

It could be comeing from your rear propshaft, which may be loose or the rear diff.

I may be wrong but its worth a look.

Title: Whats that whining?
Post by: hobbit on February 22, 2006, 22:29:41

Leave the missus and kids at home :wink:

Seriously though, does it go with the engine revs or when you go through the gears?

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 22:50:16

Definitly with the engine revs as I can hear it when the missus isn't in the car :lol:

I'll check if the rear prop shaft is loose tomorrow. How would I check if I have an iffy diff

Title: Whats that whining?
Post by: Mark2Disco on February 22, 2006, 23:02:48

do you mean like a belt slipping ?

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 23:09:19

I occasionally have a belt that slips but its definitly not that. Different noise altogether. Only happens when I'm moving if that helps?

Cheers

Title: whining
Post by: way2deep on February 22, 2006, 23:11:01

ya not having much luck mate....need more info really if possible.

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 23:16:02

Not had much luck at all with this. Must admit the noise has been there for awhile now  :oops:

But basically when I accelerate theres a whining noise, if I open the window it doesn't sound louder.

Fancy a drive round the block tomorrow evening Robbie? See what you think?

Title: whining
Post by: way2deep on February 22, 2006, 23:18:05

can do mate.be home around half six .so whenever ya ready after then

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 23:20:10

Thanks mate, your a star yet again :lol:  :lol:

Heard it was a good day on sunday, think I made the right decision with not coming with road tyres

Title: Whats that whining?
Post by: Mark2Disco on February 22, 2006, 23:29:46

turbo whistle ?

Title: whining
Post by: way2deep on February 22, 2006, 23:30:11

nah ,ya should have come with us,most of the getting stuck bits was down to driver error not tyres  :D ....the landies were on very road bias tyres

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 23:33:48

More a whine than a whistle, I'm sure its coming from underneath  rather than up front

Title: Whats that whining?
Post by: muddyweb on February 22, 2006, 23:36:06

Wheel bearings are a first port of call... jack the wheels up and listen for noise / look for movement.

Next might be diff bearings... but this is a bit less common

Title: Whats that whining?
Post by: Leigh on February 22, 2006, 23:51:10

Thanks I'll take a look tomorrow, although it passed its mot a couple of weeks ago and the noise started before then. Wouldn't it have failed on wheel bearings if it was them?

Cheers

Title: Whats that whining?
Post by: Dirty Gertie on February 22, 2006, 23:53:11

With any whining noise coming from the drivetrain, I'd always suspect UJ's first!! Easy to check, cheap n simple to replace!

Title: Whats that whining?
Post by: muddyweb on February 22, 2006, 23:57:30

UJ's are well worth checking, but they don't usually manifest as a whining... more often as vibration or squeaking.

Failed bearings should have been caught in the MOT (but I didn't know it was happening when you had a test ;-))   Still well worth checking though

Title: Whats that whining?
Post by: lrmike on February 23, 2006, 02:45:08

If the whine is there on acceleration, but goes away when you let off you may have an issue with the pinion bearings in the diff or the ring and pinion gears, maybe from lack of oil or contamination (water).  Had it on disco's before..

Title: Whats that whining?
Post by: Range Rover Blues on February 23, 2006, 14:48:55

If it's coming from underneath, on acceleration and consistent with road speed rather than engin espeed I'll say it's the diff.  Drop the oil and refill, if it keeps doing it it keeps doing it, they get progressively worse 'till you decide to replace it.

If it's an engine speed related whine I'd say turbo.  Check that it hasn't got oil contaminated recently as this makes them less efficient and therefore noisey.  Have you had any work done recently on the inlet side? intercooler cleaned anything like that?

Title: Whats that whining?
Post by: Mace on February 23, 2006, 15:27:47

Try travelling at speed, dip the clutch, let the revs drop,see if the noise goes away.
Then throttle back up to the revs you were at before you dipped the clutch (keeping the clutch depressed), listen again.
Decide at what point it's making the noise.

This will tell you whether it's engine related or load related.

I've had a whine for ages which only appeared under load. Sounded just like a diff whine from the front. It was wheel bearing related but I ended up replacing the stub-axle and inner bearings too. Whine's now gone.

Title: Whats that whining?
Post by: Evilgoat on February 23, 2006, 15:39:06

Thought about failing alternator bearings? Also an alternator will whine/whistle under a load aproaching its operating limits. When rabbit is cold she sounds like she has a turbo fro a few minutes as the Alternator replenishes the duff battery.