21mm socket sump plug C4 1.6?

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Gman2
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21mm socket sump plug C4 1.6?

Post by Gman2 »

I was planning to do an oil change today and my sump plug is a hex with some sort of recess in the centre. Doing some googling am I right in thinking that it's 21mm? Got tons of sockets but typically none fit :roll: What's the recess for btw?
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Re: 21mm socket sump plug C4 1.6?

Post by elma »

If it's a square it's for a square socket.
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Re: 21mm socket sump plug C4 1.6?

Post by CitroJim »

Often they are 21mm as well as a square...

If it has a hexagon on it then there is a very good chance it'll be 21mm..

It is certainly the case on the older XU(D) and TU engines...
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Re: 21mm socket sump plug C4 1.6?

Post by demag »

Isn't it a 10mm square hole in the middle?

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Gman2
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Re: 21mm socket sump plug C4 1.6?

Post by Gman2 »

Cheers peeps - thought I'd check before heading off and buying one.

In the meantime I've dropped in some new plugs - the motor factors came up with the Bosch Suepr4's for £15. I checked with my local Citroen dealer before hand and it's what they'd use as well but quoted me £36! Bit of a fiddly job but no real issues. Sorted the hesitancy in the car as the hose from the resonator to the air box had become detached so all in all not a bad day so far.
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