Suzuki 4x4 Club™

[silverstone]

Hello all, one for the techies, I have a rattle from the top end of my 2004 2.0 td mainly when cold, its not really bad but seems to be steadily getting worse when I lift off when changing gear, Sound a bit tappety although I believe they are of the bucket & shim set up these days. Was wondering if its a big job for a novice (engineer by trade but do my own servicing, brakes etc)  Assuming this is the problem are they adjustable or is it a replaceable part
thanks in advance

[Google]