Annoying rattle

Hi Guys, I need your help on this one:

Since last sunday there is a annoying ratle from the top of my engine, it seems that it comes louder when the throttle is aplied to a certain rpm, although when throttle is aplied like it's been driven with an egg under it it's barely noticable and also in 4th and 5th gear it's next to normal.

Overtaking a car it sounds like if someone threw a spanner in it though.

My technical skills on cars is very basic but I have the idea that this rather comes from the VVC mechs instead of the valves, but I try to sort out what the problem can be before I bring it in for repairs.

The sounds seems to come out of the rocker cover

(when idle and boot open)

I'll try to get a link in to the video I took:







I drive a '97 1.8 VVC that has 145.000 km

drivebelt is replaced at 80.000 km

5 layer metal shim headgasket

oil consumption is 1l /1500 km, oil level is normal.



sugestions anyone?

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