Continuing, got the head and block back from the machine shop where the 2 valves were replaced, valves were seated, the seals for the stems put new, the whole deal.
In the mean time i cleaned all the parts that were taken off the car, brackets, mounts, ancilliaries etc, because all the years take a toll and the gunk ammounts up to alot.
New gasket kits, new head studs, water pump, thermostat, all the belts, and replaced some rubber hoses that were cracked or worn. The Mercedes dealership is close to work so i bought some of the stuff there and i was surprised by the prices, some stuff was really cheap, the only thing i think was way too expensive was the transmission and differential oil, tranny fluid was like 25€ per litre, and diff oil was 47€ per litre, i had to buy 2 litres of each as they take more than 1 litre to top up, but at least i could rest easy knowing i had the appropriate fluids for important mechanical parts to try and spare them as much as i can.
The only issue we came across while assembly was the damn timming chain gear that does the advance on the intake camshaft, the one that slides in and out via the spring inside, the inside gear was worn near the entrance and they did not want to match at all, so i had to file the entrance of the teeth and use a special compound that when applied to both gears you slide them on eachother and the paste eats away whatever is causing it to not match correctly, after that and all cleaned up they matched smoothly without any play.
With the engine totally put together and inside the car, topped the fluids, the engine oil i use is Petronas 5w40 3000 full synth that i change every 10,000km (6,213mi), topped the coolant.
Time to turn it over and see if it works!!
And it did! on the first try too!
Time to check for leaks, bleed the coolant circuit, all seemed ok. Got it to heat up to normal temp and i notice that its making way too much noise on the head, its coming from the hydraulic touches ( i dont know what its called in english, but its the part where the camshaft lobes hit to push the valves down ) it got me scared thinking they may have been damaged when the car overheated...well the noise died down and it makes sense, they are hydraulic and need to charge with oil so the more the car ran the faster they started to work properly.
Ok off for a ride around the block...
First 10 meters, oil leaking on the ground, a good 2 litres...its coming from the passenger side, next to the alternator, pulled the car back into the workshop. Took the kompressor out, found it! its coming from the tensioner screw, the washer may have not been seated correctly, repositioned it, filled oil and cleaned all the area with degreaser.
Round 2, started up and ran to normal temp, no leaks that i could see, all seemed fine so i went out and took it to the M.O.T center that was 10 minutes away ( since the car was sitting for so long, the period for the mandatory M.O.T had gone by so now it was illegal to drive on the road ). It passed all tests even the CO2 test that i was fearing due to the fact my Catalytic converter is on its way out.