What causes this?

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Stonehopper
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What causes this?

Post by Stonehopper »

Not much going on - so . . .

Snow and ice can make some impressive sculptures and patterns, but metal?

This is a wheel bearing race from the front of the GS. It was replaced several years ago, but the fascination is in the location, and formation of the indents. It's as though they were engraved with a tool, yet they were made by the passing over of the ball bearings.

It's called brinelling, but this example shows only two indents in the entire race.

Closest I have come across is this image on the net:
https://duckduckgo.com/?q=brinelling&t= ... 1372916295
GS bearing 005.JPG
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GS bearing 002.JPG
Derek
aerodynamica
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Re: What causes this?

Post by aerodynamica »

I had the same on a CX front wheel bearing race. Gave a regular rhythmic noise that increased with speed but there was no 'play' in the wheel as would often be seen in a dead bearing.
Graeme M
2008 C5 Exclusive Tourer 2.0 HDi
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CitroJim
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Re: What causes this?

Post by CitroJim »

Last time I had that was on an MG Metro rear wheel bearing.. The car was almost new and very low mileage... I put it down to a small imperfection in the race heat-treatment or a flaw in the steel that prevented heat treatment working correctly...

Of all the Citroen and Peugeot wheel bearings I've replaced across many Xantias, XMs, 205s, Saxos and AXs I've not seen this, the bearings having failed simply through the grease generally drying out and hardening into lumps... The balls and tracks looked superficially OK and likely with a clean-up and new grease they could have done another turn - had they been amenable to sensible disassembly rather than being forcibly popped apart during their pressing out of their housings...
Jim

Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
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Stonehopper
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Re: What causes this?

Post by Stonehopper »

Thank you gents. Two replies on consecutive days!

It does seem to be a strange anomaly. No play was detectable in the wheel bearing, though it would growl on right hand turns. Long since replaced.
Derek