mine was doing that noise u talk about tika,tika,tika sound over the norm diesel noise it was my top tensioner then i went further to find suff was ready to break down further at 126km
I can only speak for min, but it's like a worn out/ buggered tappet sound worse when starting first thing, especially if its cold, example: took 2 goes to start this am, bout 10 degrees and a crap load of due in the air, it's very much like a tika,tika,tika sound over the norm diesel noise, not very helpful but I hope it helps, if in doubt get a diesel mech to have a listen.