Whining noise on a jaguar xe diesel 2.0 litre

Whining noise on a jaguar xe diesel 2.0 litre

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Ply

Original Poster:

4 posts

1 month

Tuesday 20th October
quotequote all
As no one at jaguar seems to be able to identify maybe someone with mechanical knowledge might know.
My jag has a whine (even when my wife is not in it) between 45 and 40 mph but only when decelerating. Above or below there is no sound. It's not bearings as they have been replaced. Wheels from another jag were put on and the noise disappeared so they assumed it was tyres. New tyres fitted and sound still there. When I accelerate the noise disappears and when I brake there is no noise. Only when the car is decelerating between 45 and 40.

PositronicRay

20,067 posts

142 months

Wednesday 21st October
quotequote all
Ply said:
As no one at jaguar seems to be able to identify maybe someone with mechanical knowledge might know.
My jag has a whine (even when my wife is not in it) between 45 and 40 mph but only when decelerating. Above or below there is no sound. It's not bearings as they have been replaced. Wheels from another jag were put on and the noise disappeared so they assumed it was tyres. New tyres fitted and sound still there. When I accelerate the noise disappears and when I brake there is no noise. Only when the car is decelerating between 45 and 40.
Is it a manual?

GreenV8S

28,497 posts

243 months

Wednesday 21st October
quotequote all
Perhaps something is hitting resonance under those particular conditions. Is it affected by steering input or gear selection?

Ply

Original Poster:

4 posts

1 month

Monday 26th October
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Hi,
Although automatic, it makes no difference the gear selected. Steering makes no difference. Just collected car after service. They said it is tyres but have already replaced them after they suggested it was tyres the first time they checked the car. They then said it was perhaps wrong tyres! Since the the car had the original tyres when I bought it and the whine was present then I think this is not plausible. I suggested the alloys themselves but the "senior technician" said that shouldn't be the case. I find it incredulous that the supposed specialists have no clue as they can only refer to tyres every time.
The whine is only present when decelerating from 45 through 40. If I accelerate between these speeds the noise disappears but if I take my foot off accelerator the noise reappears. The road surface makes no difference. It also makes no difference if wet or dry.

Auntieroll

540 posts

143 months

Tuesday 27th October
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Is this front or rear wheel drive ?
IF rear wheel drive and the sound only occurs in quite a narrow band of road speed , (independant of which gear is selected ) and directional loading as your post seems to imply it could be a symptom of diff problems ,possibly pinion bearings on the way out allowing the tip of the pinion gear to engage too deeply.

Try applying the brakes extremely gently on the overrun when the noise starts ,this will reduce the load on the axle and should confirm the problem is in the diff.

Removing the rear seat cushion to reduce the sound insulation may also help diagnosis.

A similar symptom was present in a very narrow ( 1-2mph ! ) band on the overrun in many axles fitted to a prestige car manufacturer I worked for back in the 70's .
The good test drivers could repeat the whine at will.
Cause was distortion introduced by clamps used during heat treatment before final lapping.

The customers rarely complained or noticed as the problem only occurred on the overrun
and they were usually through it in a very short time.
HTH

Ply

Original Poster:

4 posts

1 month

Tuesday 27th October
quotequote all
It is front wheel drive. During deceleration if I gently apply brakes the noise disappears. It only occurs through normal deceleration and when I gently accelerate the noise also disappears.
Thanks

Auntieroll

540 posts

143 months

Tuesday 27th October
quotequote all
In that case it could be a gear or gears beginning to break up or , more likely bearing /s
starting to do the same.
A quick google showed that the gearboxes are renowned for being noisy....

Ply

Original Poster:

4 posts

1 month

Thursday 29th October
quotequote all
Thanks for info. Appreciate it