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So I am getting my 993 C2S hollow spoke wheels refurbished. The left rear wheel has a rattling noise that appears to be coming from inside the wheel.
Any ideas on what it could be and how it could be fixed?
The refurbisher said he does not think it could be a part from the valve stem as the hole is too small for it to fall through. His ideas are that it could be some impact from a pothole or similar dislodged a piece of material from the inside of the spoke, or maybe a previous installer broker off a screwdriver tip inside somehow. Their suggestion was to potentially spray a tire sealant foam that would hold whatever is inside in place, and is supposedly weightless.... I am not so sure about that.
So I am getting my 993 C2S hollow spoke wheels refurbished. The left rear wheel has a rattling noise that appears to be coming from inside the wheel.
Any ideas on what it could be and how it could be fixed?
The refurbisher said he does not think it could be a part from the valve stem as the hole is too small for it to fall through. His ideas are that it could be some impact from a pothole or similar dislodged a piece of material from the inside of the spoke, or maybe a previous installer broker off a screwdriver tip inside somehow. Their suggestion was to potentially spray a tire sealant foam that would hold whatever is inside in place, and is supposedly weightless.... I am not so sure about that.
Do you have the wheels refurbished without taking the tires off? Take off the tire ans see with your own eyes what's rattling around!
Are your wheels the hollow spoke variety? Check the part numbers on them. If so I could see that in the manufacturing a small waste flake of metal could get trapped inside hollow spoke during manufacturing. If so, I would think it was always present and of no consequence as I suspect one can't hear it while driving. If it had enough mass to alter wheel balance it would have been caught long ago.
If your wheels are not the hollow spoke variety it becomes more of a mystery as the spokes, in theory, are a solid casting. In this case, I can only theorize that there is some sort of open space in the rim when it was formed where metal was rolled over to form a shape such as a rim bead and there is some small debris metal captured internally to where the metal is rolled. This too had to be always present and is not a functional issue.
If your wheels are the three-piece variety with the fasteners attaching the rim sections to the spokes or the wheels are aftermarket it could be any number of issues.
Andy
Tires are already off, so are the valve stems. Rattle is from inside
Sorry! The mentioned tire foam made me think wrong! Shake the wheel as good as you can with the hole facing downwards and hoover in the hole at the same time! Crazy I know but may help to locate the object! Could it be something that went wrong during the casting?
With hollow wheels, only the spokes are hollow. The rest of the wheel is a casting. First determine which spoke the rattle is coming from and inspect it for any sights of damage or repair.
If I took a set of hollow spokes to a refinisher and he suggested shooting one of them full of tire foam to stop a rattle, I'd be finding another refinisher.
As for your problem, looking at the image in Post #7, there appears to be a channel for small debris to get into the wheel via the valve stem port and around the hollow portion of the rim if the valve stem is removed. There's also a chance that the wheel has been damaged somehow and has shed a piece internally. If they were my wheels, I'd be talking to a shop/technician that knows 993's and see what they say. This can't be the first time a hollow spoke wheel has had an internal rattle. Regardless, I'd have the wheels checked for cracks before moving forward.
Have the wheels been refurbished in the past? The hollowspoke structure needs to be understood by the wheel specialist - if it's been put into paint-strip / acid bath whatever you call it, and then NOT hung up (with valve hole at the bottom) to allow any fluid and/or debris (from paint or the fluid itself) to escape / drip-out over a period of time (ideally overnight) before the wheel is repainted and valve resealed, then whatever remains could either dry-out and/or become a moving weight, liquid or solid, which also makes the wheel difficult to balance.
Have the wheels been refurbished in the past? The hollowspoke structure needs to be understood by the wheel specialist - if it's been put into paint-strip / acid bath whatever you call it, and then NOT hung up (with valve hole at the bottom) to allow any fluid and/or debris (from paint or the fluid itself) to escape / drip-out over a period of time (ideally overnight) before the wheel is repainted and valve resealed, then whatever remains could either dry-out and/or become a moving weight, liquid or solid, which also makes the wheel difficult to balance.
Clumsy sentence - do you see what I mean?
Yes they have been by the previous owner. They were however refurbished by the same guy I am using know who is, I am told, the best person in the UK for it (his website actually explains this particular issue that you explained above).
Also the fact that it seems to be coming from a single spoke only is confusing to me, as as far as I am aware spokes aren't exposed to wherever the valve stem is?
Also the fact that it seems to be coming from a single spoke only is confusing to me, as as far as I am aware spokes aren't exposed to wherever the valve stem is?
I agree the photos of a Turbo Hollowspoke don't show it for certain, but this is a Turbo II wheel I think, and the voids look all connected?
06-01-2020, 07:30 AM
Rattling noise inside hollow spoke wheel
