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Missing..?..it looks like it hasnt been refitted.....what was recently done for that engine not to be re-fitted
 

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I have a 307 with the 1.6l TUP5JP4 engine and it nothing like that. I think you must have the 2.0 litre 16V 143PS petrol engine (EW10A). If you want to PM your VIN I can confirm the engine type but everything I looked at suggests the engine is a 2l 143PS (EW10A) petrol engine.

I am fairly sure that connection is not used on your engine. The original 307 with a EW10J4 2l engine had a pulse air pump as part of the anti-pollution equipment. I can't find any mention of it on the engines used in post 2005 (Facelift version) 307. I have attached a parts list which shows the pulse air system used on the original 307 with the 2l 140PS engine (EW10J4).

The 206 used a similar system but a 206 with the EW10J4 I looked at here in Australia didn't have a pulse air pump. I suspect it may never have been fitted to cars sold in Australia. All it did was put extra air into the exhaust while the engine was cold.

I have attached the coolant outlet parts list which shows that part of the cylinder head and the gasket. I can't find anything in Peugeot Service Box that show a connection to that point. I have also attached the procedure to remove and refit the coolant housing and it mentions the gasket but there is no mention of removing a part in that position to fit the new gasket.
 

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Peugeot 307 2006 2.0 petrol engine
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I have been told on another forum that it could be the rocker cover casket would that sound about right?

Rocker cover gaskets on the EW10 engines will wear sand that's a common problem some people fixed them with silicon but they will start to leak again after a while , if you are sure that roker cover gaskets are worn so you need to buy new ones from AliExpress , i bought a pair with a good price

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Peugeot 307 2006 2.0 petrol engine
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I think the attached parts list covers the rocker covers for your car. It looks like the cover and gasket (item 14) for the front cover came as a pair if you bought them from Peugeot.

Aliexpress sells them individually

OMR 4.57 34%OFF | Baificar Brand New Engine Intake Exhaust Valve Chamber Cover Gasket With Lid Cap For Peugeot 307 308 408 508 3008 Citroen C4 C5

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