Plaioz

New Member

• Aug 26, 2021

• #1

Got a defender 90 2011 with 60k miles, already checked wheel bearings, the car was neglected for a while so i assume the sound started long time ago. Changed all diff and transfer box oils.

Just want to know if someone had this kind of problem of a low humming noise only at that speed, the noise doesnt change pitch, its a constant frequency at 60 kmh, before or after that speed the sound is totally gone.

 

Def90man

Percy the Pedant

Full Member

• Aug 26, 2021

• #2

Could it be tyre related? They can make all sorts of strange noises especially if they are old and worn/going out of shape

 

Plaioz

New Member

• Aug 26, 2021

• #3

Def90man said:

Could it be tyre related? They can make all sorts of strange noises especially if they are old and worn/going out of shape

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Tyres are in good shape, is a good diagnostic jacking the car up and accelerating to 60kmh to see if it isnt the tyres?

 

Def90man

Percy the Pedant

Full Member

• Aug 26, 2021

• #4

Plaioz said:

Tyres are in good shape, is a good diagnostic jacking the car up and accelerating to 60kmh to see if it isnt the tyres?

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If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

 

H

Hicap phill

Well-Known Member

• Aug 26, 2021

• #5

Def90man said:

If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

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But the video will be fun to watch

 

kermit_rr

Very

Full Member

• Aug 26, 2021

• #6

My tyres are noisy around 65mph

 

Plaioz

New Member

• Aug 26, 2021

• #7

Def90man said:

If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

Click to expand...

I only have chunky firewood an the factory tool to jack de car up, will try it this weekend.

Its strange, the noise is only between 60-65 km/h. Could it be the gearbox?

 

Def90man

Percy the Pedant

Full Member

• Aug 26, 2021

• #8

It could be many things. The prop shafts could be singing at a certain speed too

 

moremuckmush

Well-Known Member

• Aug 27, 2021

• #9

Is it still there when you dip the clutch.. would rule out tyres if it ceased humming?

 

Plaioz

New Member

• Aug 27, 2021

• #10

moremuckmush said:

Is it still there when you dip the clutch.. would rule out tyres if it ceased humming?

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Tried dipping the clutch, mixed results, the sound is bit louder when accelerating than decelerating
Will try this method again

 

lightning

Well-Known Member

• Aug 28, 2021

• #11

l have a similar noise at exactly 65mph, it's my rear differential and has done it for at least 50,000 miles.
Doesn't do it below 63mph and above 67mph

 

DefenderAdventuresUK

Member

• Aug 29, 2021

• #12

I have a similar sound at a certain speed and I ID'd it to the roof rack. At a certain wind speed it resonates like a badly tuned cello.

 

Plaioz

New Member

• Aug 29, 2021

• #13

Booked for an alignment and tyre balance. Might start from the basics

 

goonarmy

Beer tester

LZIR Despatch Agent

• Aug 30, 2021

• #14

Cv joint?

 

Plaioz

New Member

• Sep 1, 2021

• #15

lightning said:

l have a similar noise at exactly 65mph, it's my rear differential and has done it for at least 50,000 miles.
Doesn't do it below 63mph and above 67mph

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Have you opened the diff to check any damage from the noise?