Propshaft ringing

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Propshaft ringing

Postby rollercoaster » 29 Oct 2017, 22:35

Some might say they all do it.
Only there when pulling hard in too higher gear,
when motor is really chugging..
No other problem no vibration when driving at all.
Before I rush out and get a new sliding prop,
is there a simple cure?
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Re: Propshaft ringing

Postby footstuck » 30 Oct 2017, 00:00

I had the same noise and it disappeared when i installed a new VC
The splined plates within the VC all had excessive wear, so the core was no good for rebuild :cry:
The only way to stop the ringing (prior to VC replacement) was to de-couple :ok
Here we go again :roll:
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Re: Propshaft ringing

Postby dave friday » 30 Oct 2017, 00:40

My van has a sliding prop fitted and it still rings !
I dont think, so I'm not[do I exist?]
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Re: Propshaft ringing

Postby silverbullet » 30 Oct 2017, 13:37

footstuck wrote:I had the same noise and it disappeared when i installed a new VC
The splined plates within the VC all had excessive wear, so the core was no good for rebuild :cry:
The only way to stop the ringing (prior to VC replacement) was to de-couple :ok
Here we go again :roll:
The splines in your VC spindle were worn to razor edges! No wonder the prop rattled...
Are all these replacement props fitted with an inner damping tube (usually a thick cardboard one, bonded in) or not?
If they go "ping" when flicked, they don't.
Used to be standard practice for the likes of Jaguar, who were supplied by GKN...

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Re: Propshaft ringing

Postby rollercoaster » 31 Oct 2017, 00:07

So the theory is that the ringing is caused by the splines in the VC being worn..
my VC was recently refurbished but the splines are not I presume.

Are there props made for us that do have sound dampening inside?
What about some trick like retro filling them with foam or something?
When they are pinging, is that a sign that it is further destroying the splines?
Anything we can do to mitigate this with a copper grease or something?
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Re: Propshaft ringing

Postby silverbullet » 31 Oct 2017, 08:07

The front diff input shaft has a coarse spline to drive the VC casing, the VC spindle has a (smaller, finer) spline to drive the pinion shaft.
Renewing just the VC only halves any slack/backlash due to wear.
In Nick's case, the VC had been hammered to death.
Using a graphited anti-scuff paste on reassembly gives a degree of protection to the splines, but I also drill three small holes in the large spline boss to try and get some diff oil to them.
Foam filling the prop? Might work, it would need to be the non-shrinking, non-absorbant type used for yacht masts and how to guarantee a good fill with no voids to avoid balance problems?

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Re: Propshaft ringing

Postby tforturton » 31 Oct 2017, 11:49

Question - are you running standard size wheels and tyres?
Mine never used to 'ring' when running standard 14in wheels, but since I changed to 15in Mefros, I get the same ringing you mention. Tends to tell me I need to change down a gear...
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Re: Propshaft ringing

Postby rollercoaster » 31 Oct 2017, 12:07

you are right,
as I said at first it only happens when in too high gear.
235/70 16 since you ask!
They feel ok and the gearing is nice.
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Re: Propshaft ringing

Postby footstuck » 17 Nov 2017, 23:09

I think that the shock wave (diesel Knock) that travels through the transmission
causes damage over a long period.
In my case, the prop on the 16" doka (which 'Rang' like the fire station' when at low engine revs) was a solid prop with no sliding spline or rubber doughnut.
The VC worked right up to its removal, which was a precautionary refurb only.
The ringing was not there when the gearbox was in the De-coupled mode
(i wasn't trying to make any other point there) :wink:
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Re: Propshaft ringing

Postby jebiga41 » 18 Nov 2017, 15:43

footstuck wrote:I think that the shock wave (diesel Knock) that travels through the transmission
causes damage over a long period.
In my case, the prop on the 16" doka (which 'Rang' like the fire station' when at low engine revs) was a solid prop with no sliding spline or rubber doughnut.
The VC worked right up to its removal, which was a precautionary refurb only.
The ringing was not there when the gearbox was in the De-coupled mode
(i wasn't trying to make any other point there) :wink:

Didnt think it was exclusively a diesel thing any petrol owners out there have or have had prop ringing?
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Re: Propshaft ringing

Postby Winchweight » 18 Nov 2017, 16:18

Yup. Mine is a WBX and it rings. Usually in 2nd when I start accelerating off a roundabout etc or if I changed gear a bit early and it’s labouring slightly.
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Re: Propshaft ringing

Postby Bigjcc55 » 18 Nov 2017, 23:46

Yep, same here, with a re built diff, gearbox, vc, and a new brickwerks prop.
I remember it being just as bad before everything was done.


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Re: Propshaft ringing

Postby rollercoaster » 19 Nov 2017, 18:21

No way!
A new prop and its still ringing!
What is causing this?

I remember being very suspicious of my prop on a previous syncro,
it was a knackered WBX and the prop vibrated badly, thought I should change it..
but after putting the Subaru motor in the prop was fine.
My feeling is it was loose main bearings shaking down the prop.
However that has to get all the way through the gearbox I suppose,
so thats a very unlikely cause?

I was told there was a rubber something or other inside the prop,
and after time it disintegrates and is not serviceable.
Maybe the prop you bought was just refurbished UJs, not a new prop?
Was it the sliding version or solid?
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Re: Propshaft ringing

Postby Bigjcc55 » 19 Nov 2017, 19:22

It was a sliding one, so it's making me think it's something else that's rattling and the noise is traveling along the prop. It is a definite ringing noise tho.
I'm going to get a proper look at it when I get some interest in the van again, it's hidden out the way for the winter to stop this problem and a few others peeing me off and making me lose more interest in it.



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Re: Propshaft ringing

Postby silverbullet » 21 Nov 2017, 20:24

I still find it hard to believe that new props are made with an undamped tube. Its just cheaparse corner-cutting.
No excuse.
google "jaguar xjs propshaft" and look closely at the construction of the one-piece 3.6 prop (it had a plug-in spline at the gearbox end)

What about this firm in Cheshire?

http://www.firowpropshafts.co.uk/about-us/

Personally speaking, I will go to these guys because they are local to me!

http://propshaft-services.co.uk/

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