Jag IRS "clunk"

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simonjrwinter
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Jag IRS "clunk"

Post by simonjrwinter »

[youtube]https://youtu.be/smDNaScHwi4/youtube]

Pretty sure this is not splines on the wheel, sounds more like splines in the hub....on acceleration and braking
Opinions please
Thanks

Simon
Last edited by simonjrwinter on Wed Aug 12, 2020 12:34 pm, edited 1 time in total.
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KevinW
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Re: Jag IS "clunk"

Post by KevinW »

Do you know if the rear splines been loctited on?
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simonjrwinter
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Re: Jag IRS "clunk"

Post by simonjrwinter »

I don’t know, but I think I’ll probably be taking the L/H driveshaft/hub assy up to Ed at Ward’s to get it sorted pretty soon.
Simon
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peterc
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Re: Jag IRS "clunk"

Post by peterc »

Looking at the video looks like the wheel is moving relative to what can be seen in the back ground. That’s a hell a lot lot of slop. Is the hub moving in the wishbone.
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Re: Jag IRS "clunk"

Post by simonjrwinter »

As the car is just being held on the handbrake, I would expect some movement when the whole weight of the car is being pushed back and forth! With the wheel off the ground it’s much more difficult to see any movement. I would expect a more modern outboard disc brakes car to not move at all. High profile tyres, the hub and two U/J’s separate the wheel from the (pretty poor) jag handbrake!
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peterc
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Re: Jag IRS "clunk"

Post by peterc »

Have just checked my 20k mile Jag rear. I get that sort of movement with the handbrake off and first gear selected. It’s the back lash in the crown wheel and pinion which is evident with the whine when reversing. If the handbrake is even half on there is minimal movement and when fully on then there is zero movement, after all that what a handbrake is mean to do keep the car stationary.
I always used to say that if you could detect any movement in a prop shaft UJ by hand then the hardy spicer joint needs replacing. So same would go for the driveshafts.
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simonjrwinter
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Re: Jag IRS "clunk"

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I will get Ed to replace both U/J’s as a matter of course.
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John H
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Re: Jag IRS "clunk"

Post by John H »

I’ve just taken my rear hubs into Classic Renovation to replace the hub bearings and possible UJs. I had movement in the wheel but no clunk. These hubs have only done 5k Miles so I can only think the Jag specialist didn’t set them up right! I would have sent to Ed but he is a long way from me!
Good luck with the fix!
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peterc
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Re: Jag IRS "clunk"

Post by peterc »

Hi John,
I have had to replace the wheel bearings on one of my rear hubs. My conclusion bearing in mind the low mileage was that it was self inflicted. I realised that I had been tightening the spinner with the wheel up off the ground. Due to the recessed position of the spinner I would have been hammering at an angle and a chunk of that force would have gone into the bearing.
So now I only tap the spinner tight when the wheel is in the air and only tighten properly when the wheel is back down on the ground. I think that there is a tendency for us all to hammer too hard.
I have since witnessed it in the pits on race cars. If you haven’t got time to lock wire the spinner (e.g. in the middle of a race) then the mechanic is keen to ensure it can’t come loose and gives it an extra clout.
Yes, that symptom was clearly wheel end float and there was no clonk on rotation.
Peter C
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