Technical Whining Differential

[Rototype]

Hi Guys,

Got an interesting isssue that appears to have popped up recently, it's not really a game stopper (yet) but just something I'm concerned about.

Since I changed the oil a few months ago I've notoced when i pull of anything other than gently there;s often a 'geary whine' - this only seems to hapen when I'm pulling off at an angle and not when the wheels are straight - this is leading me to believe that it's the Diff.

My main questions are a) is this normal and b) if it's not what should I do about it - wil it destroy teh Diff if I don't do anything about it or whill it last for a few yeats with little ill effect? (ie am I looking at a big bill in the next few months or can I defer it for a while?)

Many Thanks
Rototype

 

[bugsymike]

Hi Guys,

Got an interesting isssue that appears to have popped up recently, it's not really a game stopper (yet) but just something I'm concerned about.

Since I changed the oil a few months ago I've notoced when i pull of anything other than gently there;s often a 'geary whine' - this only seems to hapen when I'm pulling off at an angle and not when the wheels are straight - this is leading me to believe that it's the Diff.

My main questions are a) is this normal and b) if it's not what should I do about it - wil it destroy teh Diff if I don't do anything about it or whill it last for a few yeats with little ill effect? (ie am I looking at a big bill in the next few months or can I defer it for a while?)

Many Thanks
Rototype

Not saying it isn't the diff but generally diffs do two things, a constant whine that gets worse with speed, usually the diff bearings and a whine that changes by accelerating or deaccelerating like on the over run, if you know what I mean, which is usually the diff gears (crown wheel and pinion worn or out of adjustment)
If it is at very slow speed as pulling away , can you get a friend to stand beside to pinpoint where noise is coming from.
Apart from that a noise in a straight line that builds with speed regardless of which gear you are in, even neutral,can can be a wheel bearing or even the driveshaft support bearing on the side of the engine for the longer driveshaft.
All this is assuming it is a "geary whine" as you describe and not the common CV joint clatter on full lock in one direction.

 

[Rototype]

I'm now coming to the conclusion the oil change has had nothing to do with this since as far as I can tell the engine and gearbox oils are separate. (did I mention it's a 63 plate 1.6 MultiJet? - It's a 63 plate 1.6 MultiJet).
My next line of enquiry is whether the gearbox oil ever needs to be replaced under normal circumstances - I can't see a service interval for it so I'm wondering if it's supposed to be sealed for the life of trhe gearbox? There doesn't appear to be any evidence of a leak but that doesn't mean that it hasn't had a leak in the past that was never topped up.

 

[RalphM]

The oils are separate and different, I usually change gearbox oil around 60.000 miles
and it maybe worth at least checking the level, another thought is could it be the
turbo whining?