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On a 307sw THERE IS A RUBBER BULB AT THE BACK OF THE ENGINE( REMOVE THE PLASTIC COVER ON TOP OF THE ENGINE FIRST BY LIFTING UPWARDS ) SQUEEZE THIS SEVERAL TIMES TO BRING THE FUEL THROUGH TO THE ENGINE.
A very good question (and one not helped by the absence of a Hayne's manual); 1) Remove the grey plastic cover on top of the engine block by turning the 6 plastic screws 90 degrees. 2) Remove the 3 bolts securing the black plastic cover in the centre of the engine block. 3) Lift up, and hey presto - there they are!
Pull it off
the oil filer on a 307 is located beneath the engine cover on the front of the engine inside a plastic housing, the filter is a paper element type.
They are in the center of the Valve cover, under the plastic "chunks" that are the ignition coils. You might need to remove the plastic engine cover first. There are several plastic clips you need to turn part way to remove this part.
check this out, it's same engine as in Rabbit http://rabbitownersclub.com/vw/showthread.php/engine-plastic-cover-4981.html
You remove the large plastic engine cover from the top of the engine (remove the three plastic caps, then loosen the three 10mm nuts). It's right on the front top of the engine under a plastic cap about 3" in diameter.
PCV valve is located in front of the engine, behind plastic (long and narrow plastic cover that covers valves and fuel lines). You need to remove one hex screw that attaches plastic cover to engine and remove plastic cover. You will see pcv valve 3-4 inches to the right of the hex screw that was attaching plastic cover to engine. Once removed you will see silver pipe at the end of the pipe plugged in engine sits PCV valve. PCV valve plugged into engine by it's mettalic side, so only plastic side is visible. Easiest way to understand how PCV valve sits is to buy new valve in auto parts store, remove plastic cover that covers fuel lines in front of engine and find a part that looks like PCV valve.
Depending on model, this engine may not have glow plugs. In engines with glow plugs, they are located next to the injectors on the top of the engine, under the plastic cover.
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You can remove the rear light cover on your Peugeot 607 by squeezing the tabs located in the middle of the light cover together. Once the tabs are depressed the light cover should come off.
It is on the top rear of the valve cover. You will have to remove the plastic cover on the top of the engine to access.