4WD problemette...

[lacroupade]

....right, no barrack room mechanics please, need someone who knows their way around the diff/front drive

When I engage 4WD on my fixed-hub Mk IV I get a kind of low frequency whining and mild vibration, and the truck seems to want to wander slightly off to the right.

There are no symptoms in 2WD and apart from the noise, 4WD does function normally otherwise.

At the moment I suspect the CV joint - wheel bearing would be noisy in 2WD and it isn't - but is there anything else in the drive chain up front that might be the cause?

And if it is CV, how costly are the bits does anyone know?

Cheers m'dears....

[kbekl]

could be half shaft bearing ??

outer cv joint from milners is £70

[lacroupade]

Originally Posted by kbekl

could be half shaft bearing ??

outer cv joint from milners is £70

oh well that could be worse I spose, plus an hour or two of labour.....

not sure about the half shaft bearing though as I'd suspect, since its permanently rotating, it should be noisy all the time....while the CV joint isn't under any real strain until its got drive through it is it?

where are all the spanner w*nkers when you need 'em?!

[kbekl]

Originally Posted by lacroupade

oh well that could be worse I spose, plus an hour or two of labour.....

not sure about the half shaft bearing though as I'd suspect, since its permanently rotating, it should be noisy all the time....while the CV joint isn't under any real strain until its got drive through it is it?

where are all the spanner w*nkers when you need 'em?!

i thought the half shaft bearing only spins in 4wd

[Hilltop]

Originally Posted by kbekl

i thought the half shaft bearing only spins in 4wd

But it's a fixed hub Mk IV so all the shafts will turn in 2 or 4 wheel drive.



Bob







.

[extreme-4x4]

paul have you actually checked the oil in the front diff ?

[makeitfit]

Originally Posted by lacroupade

where are all the spanner w*nkers when you need 'em?!

Too new for me mate, mine still has levers to heave and a clutch
My advise in this area is to turn up the sounds a bit more

[lacroupade]

Originally Posted by makeitfit

Too new for me mate, mine still has levers to heave and a clutch
My advise in this area is to turn up the sounds a bit more

No this is on the manual truck, not the automatic.....I'm just not clear what bit is freewheeling from what with fixed hubs, my assumption has always been that 4WD selection therefore takes place in the diff, but I have been wrong once before (I think...)

[tezzer]

could be the transfer box, as you have fixed hubs the diff and propsharft will be turning, you get 4 wheel drive by transfer box,

[briggie]

have a bottle of dalwhinnie 15 yr old single malt ive been given , cant wait till christmass ...... oh stuff it lol

[rustic]

Originally Posted by lacroupade

....right, no barrack room mechanics please, need someone who knows their way around the diff/front drive

When I engage 4WD on my fixed-hub Mk IV I get a kind of low frequency whining and mild vibration, and the truck seems to want to wander slightly off to the right.

There are no symptoms in 2WD and apart from the noise, 4WD does function normally otherwise.

At the moment I suspect the CV joint - wheel bearing would be noisy in 2WD and it isn't - but is there anything else in the drive chain up front that might be the cause?

And if it is CV, how costly are the bits does anyone know?

Cheers m'dears....

I've read all the threads, but I assume you are on a slippy surface when you do this, as you will get wind up if all 4 tyres are not exactly the same, pressure, tread depth, and make etc.

Yesterday I was out in the mav, auto hubs engaged, slipping in and out of 4 wheel drive, and on a straight section of ice covered road, I tried the brakes, and the Mav stopped quite easily without any skidding.

So maybe the slippy stuff isn't as slippy as you first thought, thus the wind up.
A few winters ago I was in Minesota and the temperature was -20C and the ice under foot was not slippy, I was wearing smooth soles at the time and the ice was as hard as concrete, and as grippy, I was very surprised.

If you took a glass of water throw the water into the air, it hit the ground as ice crystals. At -30C you can do the same with red wine. (What a waste)
Never tried it with Malt whisky, unless it was inside me first....

[lacroupade]

Originally Posted by rustic

I've read all the threads, but I assume you are on a slippy surface when you do this, as you will get wind up if all 4 tyres are not exactly the same, pressure, tread depth, and make etc.

Yesterday I was out in the mav, auto hubs engaged, slipping in and out of 4 wheel drive, and on a straight section of ice covered road, I tried the brakes, and the Mav stopped quite easily without any skidding.

So maybe the slippy stuff isn't as slippy as you first thought, thus the wind up.
A few winters ago I was in Minesota and the temperature was -20C and the ice under foot was not slippy, I was wearing smooth soles at the time and the ice was as hard as concrete, and as grippy, I was very surprised.

If you took a glass of water throw the water into the air, it hit the ground as ice crystals. At -30C you can do the same with red wine. (What a waste)
Never tried it with Malt whisky, unless it was inside me first....

Damned thing has been doing it everywhere,from wet roads, through a foot of snow on the autoroute to sheet ice on the way up to my house in wales, with no variation

[rustic]

Originally Posted by lacroupade

Damned thing has been doing it everywhere,from wet roads, through a foot of snow on the autoroute to sheet ice on the way up to my house in wales, with no variation

Well I guess all your front running gear has done many more miles than mine, so it could be CV's or bearings as the bearings will be under more strain while being driven.
Front prop shaft UJ's spring to mind and there is also the sliding coupling as there are 3 grease nipples on the front prop shaft.
If you greased the 3 grease nipples, you may feel a difference, but for a very short time as the grease is squeezed out.
There is more wear somewhere than there used to be, might even be the rear drive train as well.
There are just too many items that when worn will cause this problem, having looked at the other threads.

[lacroupade]

Originally Posted by rustic

Well I guess all your front running gear has done many more miles than mine, so it could be CV's or bearings as the bearings will be under more strain while being driven.
Front prop shaft UJ's spring to mind and there is also the sliding coupling as there are 3 grease nipples on the front prop shaft.
If you greased the 3 grease nipples, you may feel a difference, but for a very short time as the grease is squeezed out.
There is more wear somewhere than there used to be, might even be the rear drive train as well.
There are just too many items that when worn will cause this problem, having looked at the other threads.

thats what i'm afraid of, hence the pre-garage diagnostic. but less than 100k miles on this lady so just not sure.

I'll let you know how she gets on in the garage

[rayf3262]

If your 02 front prop is anything like my 02 front prop - don't be to surprised if there are no grease nipples.
As for the sliding coupling; it's now coated in a high tech plastic that is self lubricating, it does wear though, and this can give rise to vibration of the front prop.