As another update, i changed my cam chain tensioner today after finally reaching the cap with a deep 19 mm socket and a swivel bar. Removed the two dip stick tube nuts that fit to the cam cover and managed to slide my arm down the side of the engine and inner wing. Removing the dipstick tube completely would be a lot easier but i have never managed to find the bottom bolt.
It only took a slight twist and it was loose and i managed to undo it completely with my fingers. I compared it to the new one for spring length and it was identical and looked quite new so guessing somebody had already changed it in a hope to cure the rattle and the news is, it didn't make any difference which is what I guessed.
Couple of pics below in case somebody stumbles on this when trying to change the cam chain tensioner but don't want to hijack this thread any more than i have already.
The pictures have been rotated for some reason when i uploaded them but i was standing on a block of wood by the front offside wheel with the car in access height.
I would think a swivel 3/8 drive ratchet and deep 19 mm socket would be better but i only gave it a very slight turn with the bar and it was loose.
When i replaced the new tensioner, it is held in the compressed position by a clip that will release with the slightest compression of the piston so when it was in position i gave it a quick push and the spring released and then i replaced the retaining cap and tightened it so i knew the piston was released, it is supposed to happen automatically but i have heard of it not doing so and then the fragile plastic cam chain guides breaking.
To tighten the cap i used the same swivel bar but i had to take the socket it off a and turn it 90 degrees to find a place where it would go on the cap and then do the same to tighten it further as access is really tight.
