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peugeot 407 diesel and the injector is leaking and smoking does any one know the approximate cost to get this done someone said it is the seal.

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Hi, a set of 4 seals ( they are just copper washers ) are around £5 - the trickiest bit is removing the injector....

If you soak the base of the injector and the nuts that hold it in, in WD40 for a couple of days before you take it out it should be much easier. Make sure the old copper washer comes out too - if not then put a blob of grease on the injector and plug it back in to see if the washer 'sticks' to the injector and then lifted out together.

The washers look like this; ( these are from a 2.2hdi that I'm watching on eBay - but you get the idea.. )
Peugeot 406 2.2 HDI Diesel Injector Copper Washers Pack of 4 | eBay
and they are meant to deform slightly to fit the injector/cylinder head perfectly.
 
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