What could be the cause of this noise

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LeffeBrune
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#1 What could be the cause of this noise

Post by LeffeBrune » Tue Jul 03, 2018 6:52 am

Driving my S1 4.2 OTS on the motor way, I suddenly notice an odd noise seeming to come from the rear back. It's a pretty high pitch sounding as if one shakes a ring with a bunch of keys. The noise is not constant but appears when you drive over a bump in the road, also when driving over it a fairly low speed.

I took the car back to the garage who recently took out the entire rear axis (I had the rear differential refurbished). I thought that something might have come lose. We out it on a lifting ramp and thoroughly inspected the rear part from underneath but could not find anything that might cause that noise. (I also emptied the boot completely to make sure the noise did not come from there.)

Any thoughts what this could be?

Thanks in advance.

Georg

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christopher storey
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#2 Re: What could be the cause of this noise

Post by christopher storey » Tue Jul 03, 2018 8:38 am

The most likely explanation is that at certain angles the outer shrouds on the driveshafts are touching the hub carrier . You can usually see a bright witness mark on the outer edge of the shrouds . They can easily be repositioned by slackening off the jubilee clip and sliding them one way or the other along the driveshaft

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1954Etype
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#3 Re: What could be the cause of this noise

Post by 1954Etype » Tue Jul 03, 2018 9:19 am

Could also be the water thrower on the outer part of the aluminium hub.
Angus 65 OTS 1E11497

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MarkRado
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#4 Re: What could be the cause of this noise

Post by MarkRado » Wed Jul 04, 2018 4:41 am

Had the same problem years ago, turned out to be a bent waterthrower
Mark
1963 OTS 880436 - since 1988

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#5 Re: What could be the cause of this noise

Post by LeffeBrune » Wed Jul 04, 2018 7:30 am

Thanks for the responses.

Excuse my ignorance but what exactly is the waterthrower?

Georg

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mgcjag
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#6 Re: What could be the cause of this noise

Post by mgcjag » Wed Jul 04, 2018 7:49 am

Hi George...if you look at this https://www.sngbarratt.com/uk/#!/Englis ... UM%20SHAFT and look at item 15 its the rear hub...but where the 15 is pointing its a thin metal extensinon ring to the hub ..if you remove the rear wheel you will see the splines...follow the hub back to where it meets the ali hub carrier and you should see it..this is the part as sold seperatly https://www.sngbarratt.com/uk/#!/Englis ... 5271a30b46
Steve
1969 S2 2+2 & Building a C type replica

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#7 Re: What could be the cause of this noise

Post by LeffeBrune » Wed Jul 04, 2018 9:46 am

Thanks a lot Steve!

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#8 Answer -- What could be the cause of this noise

Post by LeffeBrune » Wed Jul 11, 2018 3:27 pm

Again thanks to everyone. The culprit was indeed the waterthrower. My garage simply took it out saying that it is in any event not a necessary piece.

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Series1 Stu
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#9 Re: Answer -- What could be the cause of this noise

Post by Series1 Stu » Wed Jul 11, 2018 7:34 pm

LeffeBrune wrote:
Wed Jul 11, 2018 3:27 pm
My garage simply took it out saying that it is in any event not a necessary piece.
Really? Would you leave a crankshaft oil seal thrower out of the assembly?
:scratchheadyellow:
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

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#10 Re: What could be the cause of this noise

Post by 1954Etype » Wed Jul 11, 2018 7:37 pm

Because it was a water thrower and not the crankshaft oil thrower.
Angus 65 OTS 1E11497

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Series1 Stu
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#11 Re: What could be the cause of this noise

Post by Series1 Stu » Wed Jul 11, 2018 7:48 pm

Ok. So the bearing gets an extra high dose of water to accelerate it's failure!

I guess the difference is that you can see the oil coming out of the engine but not the water going into the bearing.

Sorry. I'm of the "fix it, don't fudge it" persuasion.
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

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#12 Re: What could be the cause of this noise

Post by christopher storey » Thu Jul 12, 2018 8:12 am

I have to say, I agree with the throw it away viewpoint. I have difficulty in seeing how water in reality can get inside the hub. The wheel centre acts as a shroud ; the hub is rotating anyway , and water will be thrown by centrifugal force ( yes, I know it doesn't exist ) either from the periphery or out through the split pin aperture

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rswaffie
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#13 Re: What could be the cause of this noise

Post by rswaffie » Thu Jul 12, 2018 11:06 am

I don't have a professional engineering background, so I generally work on the principle that if the manufacturer's engineers specified it, didn't note in a manual that it was optional or remove it further down the production run, then it was probably there for a good reason.
Out of interest, did the garage remove them from both sides, or just the bent one?
Richard

S1 3.8 FHC Opalescent Golden Sand 889504
Undergoing a comprehensive restoration in my small, but utilitarian garage :wrench: :hammer: :fingerscrossed:

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Series1 Stu
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#14 Re: What could be the cause of this noise

Post by Series1 Stu » Fri Jul 13, 2018 4:20 pm

Its interesting that Jaguar didn't fit the water throwers on the first 6000 or so cars but then decided to add them. Surely that tells us that they were seen to be needed?

I know that, in general, we don't use them in the same way as they were intended with many not being driven in the rain so maybe you'll get away with it. Your choice.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

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