Terrano buzz

TheOtherMikeK · May 8, 2004

We've got a 1995 Terrano II diesel. Recently it's developed a
"buzzing" noise which can only be likened to someone riding a small 2
stroke bike at the side of us. It's intermittent, but getting more
frequent. Can't be heard inside the cab except with the passenger
window open.

My initial thought was the nearside front hub. The buzz varies with
road speed, not engine speed & is there even when the clutch pedal's
pressed down.

It's recently been into a local garage (admittedly not 4x4 specialists)
who seem to think it's a gearbox problem, as the buzz seems to go away
when 4 wheel drive's engaged.

I've heard that some early Terranos have suffered gearbox problems, but
as I understood things, when 4x4 is selected, that locks up the front
hubs (this is our first 4x4 so bear with me if I'm wrong) so it could
still be a hub problem after all.

Any ideas/suggestions?

--
TheOtherMikeK
==
remove random numbers to email

Henry · May 9, 2004

check your tailpipe there could be something or someone stuck in it.

H

"TheOtherMikeK" <[email protected]> wrote in message
news:[email protected]...
> We've got a 1995 Terrano II diesel. Recently it's developed a
> "buzzing" noise which can only be likened to someone riding a small 2
> stroke bike at the side of us. It's intermittent, but getting more
> frequent. Can't be heard inside the cab except with the passenger
> window open.
>
> My initial thought was the nearside front hub. The buzz varies with
> road speed, not engine speed & is there even when the clutch pedal's
> pressed down.
>
> It's recently been into a local garage (admittedly not 4x4 specialists)
> who seem to think it's a gearbox problem, as the buzz seems to go away
> when 4 wheel drive's engaged.
>
> I've heard that some early Terranos have suffered gearbox problems, but
> as I understood things, when 4x4 is selected, that locks up the front
> hubs (this is our first 4x4 so bear with me if I'm wrong) so it could
> still be a hub problem after all.
>
> Any ideas/suggestions?
>
> --
> TheOtherMikeK
> ==
> remove random numbers to email
>

Steve Hunt · May 9, 2004

> I've heard that some early Terranos have suffered gearbox problems,
> but as I understood things, when 4x4 is selected, that locks up the
> front hubs (this is our first 4x4 so bear with me if I'm wrong) so

I hope they are not driving it very far on-road in 4wd mode.

To eliminate whether it's the autolocking hubs try this.
Select 4wd and drive forward in a straight line for a few
yards. Now select 2wd and *without reversing at all*
go for a drive. Your hubs will still be locked until
you reverse, but you are in other respects in 2wd
mode. (The wheels & hubs are turning the front diff
and propshaft, but drive is disconnected inside the
transfer box).

Well, if this stops the noise then reverse a few yards
to unlock the hubs and see if the noise comes back.
If so it's possible that one of the hubs not disengaging
properly. The next test after that is to jack up
the offending wheel and spin it by hand to see
whether that rotates the corresponding front driveshaft
or not.

-- Steve

mike k · May 9, 2004

In article <[email protected]>, Steve Hunt
<[email protected]> wrote:

> I hope they are not driving it very far on-road in 4wd mode.

only far enough to see how it affected the noise - no more than around
100 yards

> To eliminate whether it's the autolocking hubs try this.
> Select 4wd and drive forward in a straight line for a few
> yards. Now select 2wd and *without reversing at all*
> go for a drive. Your hubs will still be locked until
> you reverse, but you are in other respects in 2wd
> mode. (The wheels & hubs are turning the front diff
> and propshaft, but drive is disconnected inside the
> transfer box).

I'll try that one later today

> Well, if this stops the noise then reverse a few yards
> to unlock the hubs and see if the noise comes back.
> If so it's possible that one of the hubs not disengaging
> properly. The next test after that is to jack up
> the offending wheel and spin it by hand to see
> whether that rotates the corresponding front driveshaft
> or not.

If I get the chance I'll try that as well.

We've now found a local 4x4 transmission specialist, so we'll probably
let them have a look if all else fails.

Many thanks for the suggestions.

--
TheOtherMikeK
==
remove random numbers to email

John · May 9, 2004

TheOtherMikeK <[email protected]> wrote in
news:[email protected]:

> It's recently been into a local garage (admittedly not 4x4
specialists)
> who seem to think it's a gearbox problem, as the buzz seems to go away
> when 4 wheel drive's engaged.

Just a thought but if you select neutral and the sound still persists
then surly it can not be the box. What about bearings, CV joints (both
inner and outer), differentials, tyres etc?

I once had a repeated thump, thump, thump, thump sound that seemed
to come from the bonnet, it turned out to be a tyre which developed a
small bubble in the middle of the treads, strangely there wasnt any
problems with the steering..
Have your jacked the truck up and spun the wheels?

(Dont take my word for it, Im no expert)

John

TheOtherMikeK · May 10, 2004

On 2004-05-09 13:50:41 +0100, John <Stalking*@britishlibrary.net> said:

> Just a thought but if you select neutral and the sound still persists
> then surly it can not be the box. What about bearings, CV joints (both
> inner and outer), differentials, tyres etc?
>
been to the transmission specialists today, they reckon it's not the
gearbox as it would be likely to be present all the time. They think
it may be the clutch, but I'm not convinced.

as was suggested, we drove off yesterday, selected 4wd for a few yards,
no noise. Selected 2wd, within a couple of hundred yards a noise which
could only be likened to a petrol driven chainsaw appeared. Stopped
car, reversed a few yards, noise vanished.

It's back again, but nothing like as loud.

As the noise varies with road speed, not engine speed, I'm convinced
it's something on the front axle. Not had the chance to jack it up
yet, but it's been booked in at the garage for a good seeing to on
Wednesday.

--
--
TheOtherMikeK
==
remove random numbers to email

Hedgehog · May 10, 2004

"TheOtherMikeK" <[email protected]> wrote in message
news:[email protected]...
> On 2004-05-09 13:50:41 +0100, John <Stalking*@britishlibrary.net> said:
>
> > Just a thought but if you select neutral and the sound still persists
> > then surly it can not be the box. What about bearings, CV joints (both
> > inner and outer), differentials, tyres etc?
> >
> been to the transmission specialists today, they reckon it's not the
> gearbox as it would be likely to be present all the time. They think
> it may be the clutch, but I'm not convinced.
>
> as was suggested, we drove off yesterday, selected 4wd for a few yards,
> no noise. Selected 2wd, within a couple of hundred yards a noise which
> could only be likened to a petrol driven chainsaw appeared. Stopped
> car, reversed a few yards, noise vanished.
>
> It's back again, but nothing like as loud.
>
> As the noise varies with road speed, not engine speed, I'm convinced
> it's something on the front axle. Not had the chance to jack it up
> yet, but it's been booked in at the garage for a good seeing to on
> Wednesday.
>
>
>
> --
> --
> TheOtherMikeK
> ==
> remove random numbers to email
>
Sounds exactly like the problem my father had with his Patrol 4WD is not
disengaging as I believe other people on this newsgroup have suggested.
hope this helps
John

Henry · May 9, 2004

check your tailpipe there could be something or someone stuck in it.

H

"TheOtherMikeK" <[email protected]> wrote in message
news:[email protected]...
> We've got a 1995 Terrano II diesel. Recently it's developed a
> "buzzing" noise which can only be likened to someone riding a small 2
> stroke bike at the side of us. It's intermittent, but getting more
> frequent. Can't be heard inside the cab except with the passenger
> window open.
>
> My initial thought was the nearside front hub. The buzz varies with
> road speed, not engine speed & is there even when the clutch pedal's
> pressed down.
>
> It's recently been into a local garage (admittedly not 4x4 specialists)
> who seem to think it's a gearbox problem, as the buzz seems to go away
> when 4 wheel drive's engaged.
>
> I've heard that some early Terranos have suffered gearbox problems, but
> as I understood things, when 4x4 is selected, that locks up the front
> hubs (this is our first 4x4 so bear with me if I'm wrong) so it could
> still be a hub problem after all.
>
> Any ideas/suggestions?
>
> --
> TheOtherMikeK
> ==
> remove random numbers to email
>

Steve Hunt · May 9, 2004

> I've heard that some early Terranos have suffered gearbox problems,
> but as I understood things, when 4x4 is selected, that locks up the
> front hubs (this is our first 4x4 so bear with me if I'm wrong) so

I hope they are not driving it very far on-road in 4wd mode.

To eliminate whether it's the autolocking hubs try this.
Select 4wd and drive forward in a straight line for a few
yards. Now select 2wd and *without reversing at all*
go for a drive. Your hubs will still be locked until
you reverse, but you are in other respects in 2wd
mode. (The wheels & hubs are turning the front diff
and propshaft, but drive is disconnected inside the
transfer box).

Well, if this stops the noise then reverse a few yards
to unlock the hubs and see if the noise comes back.
If so it's possible that one of the hubs not disengaging
properly. The next test after that is to jack up
the offending wheel and spin it by hand to see
whether that rotates the corresponding front driveshaft
or not.

-- Steve

mike k · May 9, 2004

In article <[email protected]>, Steve Hunt
<[email protected]> wrote:

> I hope they are not driving it very far on-road in 4wd mode.

only far enough to see how it affected the noise - no more than around
100 yards

> To eliminate whether it's the autolocking hubs try this.
> Select 4wd and drive forward in a straight line for a few
> yards. Now select 2wd and *without reversing at all*
> go for a drive. Your hubs will still be locked until
> you reverse, but you are in other respects in 2wd
> mode. (The wheels & hubs are turning the front diff
> and propshaft, but drive is disconnected inside the
> transfer box).

I'll try that one later today

> Well, if this stops the noise then reverse a few yards
> to unlock the hubs and see if the noise comes back.
> If so it's possible that one of the hubs not disengaging
> properly. The next test after that is to jack up
> the offending wheel and spin it by hand to see
> whether that rotates the corresponding front driveshaft
> or not.

If I get the chance I'll try that as well.

We've now found a local 4x4 transmission specialist, so we'll probably
let them have a look if all else fails.

Many thanks for the suggestions.

--
TheOtherMikeK
==
remove random numbers to email

John · May 9, 2004

TheOtherMikeK <[email protected]> wrote in
news:[email protected]:

> It's recently been into a local garage (admittedly not 4x4
specialists)
> who seem to think it's a gearbox problem, as the buzz seems to go away
> when 4 wheel drive's engaged.

Just a thought but if you select neutral and the sound still persists
then surly it can not be the box. What about bearings, CV joints (both
inner and outer), differentials, tyres etc?

I once had a repeated thump, thump, thump, thump sound that seemed
to come from the bonnet, it turned out to be a tyre which developed a
small bubble in the middle of the treads, strangely there wasnt any
problems with the steering..
Have your jacked the truck up and spun the wheels?

(Dont take my word for it, Im no expert)

John

TheOtherMikeK · May 10, 2004

On 2004-05-09 13:50:41 +0100, John <Stalking*@britishlibrary.net> said:

> Just a thought but if you select neutral and the sound still persists
> then surly it can not be the box. What about bearings, CV joints (both
> inner and outer), differentials, tyres etc?
>
been to the transmission specialists today, they reckon it's not the
gearbox as it would be likely to be present all the time. They think
it may be the clutch, but I'm not convinced.

as was suggested, we drove off yesterday, selected 4wd for a few yards,
no noise. Selected 2wd, within a couple of hundred yards a noise which
could only be likened to a petrol driven chainsaw appeared. Stopped
car, reversed a few yards, noise vanished.

It's back again, but nothing like as loud.

As the noise varies with road speed, not engine speed, I'm convinced
it's something on the front axle. Not had the chance to jack it up
yet, but it's been booked in at the garage for a good seeing to on
Wednesday.

--
--
TheOtherMikeK
==
remove random numbers to email

Hedgehog · May 10, 2004

"TheOtherMikeK" <[email protected]> wrote in message
news:[email protected]...
> On 2004-05-09 13:50:41 +0100, John <Stalking*@britishlibrary.net> said:
>
> > Just a thought but if you select neutral and the sound still persists
> > then surly it can not be the box. What about bearings, CV joints (both
> > inner and outer), differentials, tyres etc?
> >
> been to the transmission specialists today, they reckon it's not the
> gearbox as it would be likely to be present all the time. They think
> it may be the clutch, but I'm not convinced.
>
> as was suggested, we drove off yesterday, selected 4wd for a few yards,
> no noise. Selected 2wd, within a couple of hundred yards a noise which
> could only be likened to a petrol driven chainsaw appeared. Stopped
> car, reversed a few yards, noise vanished.
>
> It's back again, but nothing like as loud.
>
> As the noise varies with road speed, not engine speed, I'm convinced
> it's something on the front axle. Not had the chance to jack it up
> yet, but it's been booked in at the garage for a good seeing to on
> Wednesday.
>
>
>
> --
> --
> TheOtherMikeK
> ==
> remove random numbers to email
>
Sounds exactly like the problem my father had with his Patrol 4WD is not
disengaging as I believe other people on this newsgroup have suggested.
hope this helps
John

Terrano buzz

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