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 Refurbishing part-metal centre caps, e.g. 8D0 601 165K View next topic
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HPsauce
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PostPosted: Thu Apr 16, 2015 4:28 pm  Reply with quoteBack to top

I know these fit a number of wheels, though mine are for 20" D2 S8 Final Edition wheels. This design of centre:


I currently have a set of cheap Chinese imitations which are "acceptable" but have finally acquired a set of the genuine ones, though they are rather tatty and need a thorough refurb.  

Has anyone ever successfully refurbished these, they don't look very easy to take apart and the corroded patches on the metal look particularly tricky?
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Markv
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PostPosted: Thu Apr 16, 2015 5:36 pm Reply with quoteBack to top

Noggy Mike done mine for me.
Looked pukka.
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HPsauce
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PostPosted: Thu Apr 16, 2015 5:44 pm Reply with quoteBack to top

Funny, I thought someone had commented along those lines but couldn't find the thread/post.
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Markv
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PostPosted: Thu Apr 16, 2015 5:58 pm Reply with quoteBack to top

http://audisrs.com/ftopic57630-0-0-asc-ok.php+done+death
Try this Mate
Markv
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HPsauce
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PostPosted: Thu Apr 16, 2015 6:50 pm Reply with quoteBack to top

Thanks Mark, I knew I'd read some of that recently.  

Couple of differences on the ones I have though:
1. The outer metal flange is "polished" chrome-like, not "brushed" like those in the thread (and my Chinese replicas!).
2. The flange has a big (4mm?) roll-over lip pressed back over the plastic all round the external rim so I think it's not separable from the plastic without irreparable cosmetic damage.

I don't mind polished/chrome as it's a better match to the wheels, but corrosion on the flange goes into the well right up to the dark-painted plastic centre, so it looks tricky.

Do you just tap the locating pegs of the centre 4-rings smartly from behind to free those?
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Markv
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PostPosted: Thu Apr 16, 2015 6:57 pm Reply with quoteBack to top

Andrew,
Like I said Mike refurbed them all I did was send them off to him, so can't tell you what he did.I have a couple of spares which he done aswell.
If it would help I can PM you a pic.
Markv.
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HPsauce
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PostPosted: Thu Apr 16, 2015 7:20 pm Reply with quoteBack to top

Thanks, hadn't read that thread in full, sorry Mark.
I've taken the worst one apart already on the "in for a penny" principle and it wasn't too difficult, just a took few minutes.
The centre 4-rings component is quite fragile and had 2 breaks, nothing that some tiny dabs of araldite can't fix though.

Now I just need to decide how to clean up and prepare the components for repainting/lacquering. Lots of chemicals I guess along with a little fine abrasion.......  

The metal flange is VERY soft so I just opened up the three folded-over lugs on the back and worked carefully round the edge with a thin flat-blade screwdriver to "unfurl" it. A little gentle levering and tapping and it was free.  
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HPsauce
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PostPosted: Thu Apr 16, 2015 7:44 pm Reply with quoteBack to top

Markv wrote:
Mike refurbed them all I did was send them off
Hopefully he'll see this and be happy to share his techniques.  
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Noggymike
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PostPosted: Thu Apr 16, 2015 7:52 pm Reply with quoteBack to top

You have entered a WHOLE WORLD OF PAIN Andrew Lol!





If the inner 4 ring emblem is tarnished and pitted you have to refurb them to a diff finish.

If broken (just where the locating lugs are normally) when you glue them together you have a 50/50 chance of them breaking on re assembly back onto the centre.

Outer alloy ring is very delicate. If the scoring/pitting is too deep then you may run the risk of rubbing away the metal before you get a satisfactory finish if you are going for the polished look.

You will no doubt have score marks or splits around the outer alloy ring where ppl have not removed the caps properly. If you are going for a polished look this may be a difficult area to correct.

If you want a lacquered finish then refitting the outer alloy rings then be careful when folding back the outer lip back onto the plastic centre as you will crack it.




I speak from experience FROM LOADS of time spent on these things

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HPsauce
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PostPosted: Thu Apr 16, 2015 8:00 pm Reply with quoteBack to top

Thanks for the encouragement Mike.

What chemicals did you use where to do the initial cleaning?
And what colour/type of paints/lacquers for the different parts?

The broken inner rings are tarnished/pitted and I expect to secure them after refitting with a final overall lacquer coat, but I will araldite any breaks anyway beforehand.
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HPsauce
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PostPosted: Fri Apr 17, 2015 11:41 am Reply with quoteBack to top

Just a bit of hopefully useful information:

The fragile 4-rings are cleaning up very well with bathroom descaler (Hagesan Blue which is about 30% Phosphoric Acid) and gentle brushing of the worst areas with a small paintbrush.

The corrosion on the metal flange isn't doing much in response to either vinegar (mild acetic acid) or the descaler. I suspect careful polishing will be required.
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HPsauce
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PostPosted: Fri Apr 17, 2015 4:59 pm Reply with quoteBack to top

Noggymike wrote:
the inner 4 ring emblem .......

.... If broken
Just looked carefully at the other three (that await dismantling) and ALL have a break in that emblem.

The one I dismantled I just gave a test spray (of Ford Moondust Silver which I have for my Focus body but also works well touching up wheels) after merely cleaning with Cellulose thinners and it took fairly well.
Wrong colour obviously, needs to be mid-grey, I think the other thread mentioned "Steel".
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Noggymike
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PostPosted: Fri Apr 17, 2015 7:36 pm Reply with quoteBack to top

If they were pitted, chipped, tarnished, I couldn't refurb the 4 ring centre emblem pieces to OEM, so go with what finish you are happy with.

Make sure you do your prep 110% correct before painting them though.

As they have small double sided lugs on the locating pins (not on the small round 5th one)  to secure them, it means you need to press hard/evenly to re seat them properly, which normally results in them breaking again where you have glued them.

Good luck

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HPsauce
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PostPosted: Fri Apr 17, 2015 7:55 pm Reply with quoteBack to top

They (the 4-ring emblems) all look like descaler will do the job.
The first one was the worst one and has come up almost as new.

The silver spray I tried was on the plastic base, not the rings. Not sure that was very clear.   What colour would you recommend for the grey centres?

I've been trying to think of a way to press the rings back into the plastic base evenly, but it really needs a pair of matching dies to hold each component precisely and apply pressure evenly all over.
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Noggymike
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PostPosted: Fri Apr 17, 2015 7:57 pm Reply with quoteBack to top

HPsauce wrote:
They (the 4-ring emblems) all look like descaler will do the job.
The first one was the worst one and has come up almost as new.

The silver spray I tried was on the plastic base, not the rings. Not sure that was very clear. What colour would you recommend for the grey centres?

I've been trying to think of a way to press the rings back into the plastic base evenly, but it really needs a pair of matching dies to hold each component precisely and apply pressure evenly all over.



Steel.


Andrew


I think you are over thinking the re assembly of the rings  

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