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Old 5 Days Ago   #1
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Question Inner CV Drive Shaft Pops Out!

I have a 2010 Fiat 500 1.2, two months ago I found oil on my drive which turned out to be coming from the passenger side driveshaft inner CV joint seal. Garage fitted new driveshaft seal, 3 weeks later the leak was back and the garage said the retaining clip was the issue as the shaft had popped out so they fitted a genuine new clip. 2 weeks on and the leak is back again! the garage found the shaft had popped out again, advised me it could be an issue with the drive shaft or the the gearbox where the circlip locks into is worn which if the case I need to get a gearbox. Any advice on this issue would be appreciated.
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Old 5 Days Ago   #2
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Re: Inner CV Drive Shaft Pops Out!

The garage could be correct, careful examination of the drive shaft end is required and clip for wear, would try a new drive shaft first if that fails in the same way the yes replacement gearbox.
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Old 5 Days Ago   #3
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Re: Inner CV Drive Shaft Pops Out!

The driveshaft has a knuckle on the end which is probably worn causing it to pop out. Driveshafts are in two pieces, left and right, they are not expensive particularly, you may as well bite the bullet and get it changed.
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Old 5 Days Ago   #4
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Re: Inner CV Drive Shaft Pops Out!

Doesn't the 1.2 gearbox have the tripoid spider/cup arrangement?

The cup end, ought to have a shaft about 4" (10cm) long on the back.. which has a broad groove in it for a snap ring, which is a wire clip that looks like a thick paper clip.

To fit the driveshaft into the the gearbox, you line up the splines on the shaft with the gearbox and then you push the beast home until the snap ring engages with the locking groove.

Then you need to give it a sharp blow to clip the snap-ring in place (basically you're forcing it into the groove by compressing into it, and then expanding again when it's in the groove (and has the space to expand).

My money is they pushed the driveshaft into the gearbox/receiver but then did not snap it into place, so it's fallen out, rather than the groove is so worn it can't hold it in there.

In use, the drivehaft cup is held in place by the snap pin and by the fact that the other end of the driveshaft is bolted at 200Nm to the wheel hub, so the only outward movement possible is space between the inside of the cup and the tripoid spider (aka "knuckle") end of the driveshaft itself (the bit inside the inner CV boot).

It's a gnats amount of clearance (usually) and generally not enough to allow the cup to move away from the gearbox .. I'm sure someone on the Stilo page (similar setup) reckons his driveshafts have no snap-rings on the end... so the cup end of the shaft does not routinely fall out, unless it wasn't fitted 100% in the first place, OR there's enough play in the spider/tripoid/knuckle that it allows the shaft to move out (and the cup to follow it).

If *properly* refitting the cup into the gearbox housing doesn't solve it (the back of the cup has to be fag-paper close to the gearbox housing.. if you're describing the gap as "a millimeter" then it's not in place properly) then have a look at the spider.

You can get a new spider from 20-ish but if the cup is also worn (it gets grooves worn into it from the spider) then a driveshaft is about 70 from J&R .. your labour will be the same, so if you can afford it, a whole shaft is a better idea... you won't have any more aggro' from it for years.

Ralf S.
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